A Long Day Off, Four Seizures, Two Dogs, One Tyrant, and a Movie Called The Wraith

Today was a great day, although I am beginning to suspect that my definition of a “day off” has become somewhat corrupted over the years. Technically, I am off from my usual job as a trauma and critical care surgeon in Boston, and I have been off all week. I am also off for the remainder of this week, which means I have several more days before Monday arrives and the hospital, trauma bay, operating room, ICU, consult pager, and all the other assorted machinery of academic medicine once again reclaim my existence. One might reasonably assume that a physician with a week away from the hospital would spend those days doing absolutely nothing more strenuous than sitting around drinking coffee and watching television. Apparently, I am not that person. Instead, I have spent much of my time volunteering at our local fire and EMS department because, in addition to being a trauma and critical care surgeon, I am also a licensed paramedic, and there is something deeply satisfying about practicing medicine in a completely different environment. The hospital is where I make my living; the ambulance service is where I volunteer because I genuinely enjoy being part of the community.

The day started, as most of our days do, at 4:00 in the morning. Sadie and I got up, got ourselves moving, and headed out for our morning jog. For late August, the weather was about as close to perfect as you could reasonably ask for. There was enough coolness in the morning air to make running pleasant without having that first hint of autumn creeping into it, and the humidity had mercifully backed off. There is something particularly enjoyable about an August morning when you can feel that summer is still firmly in command but the atmosphere has finally decided to stop trying to kill you. We went out, ran our usual route, came home, and went about the familiar choreography of getting ready for the day. Sadie had to head into Boston for work, while I had nowhere in particular that I needed to be. Breakfast was uncomplicated: peanut butter and Cocoa Crunch cereal, along with coffee, which is essentially the nutritional equivalent of saying, “We have places to go and things to do, but let’s not get carried away.” Sadie got herself ready and headed toward Boston while I lingered at home for a little while before heading over to the fire and EMS station.

It turned out to be a surprisingly busy day at the station. Rural EMS has a rhythm all its own. Some days you can sit around for hours, drink an irresponsible amount of coffee, talk about everything and nothing, check equipment for the third time, and wonder whether the tones are ever going to drop. Other days, the radio seems determined to keep everyone moving. Today was one of those days. What made it particularly unusual was the number of seizure calls. Four separate calls involving seizures in a relatively small rural community is statistically odd enough to make you raise an eyebrow. Seizures are common enough in emergency medicine that they are hardly exotic, but four in a single day in one small community is certainly not something I see every day. Each patient still has to be approached individually because “seizure” is a description of an event, not a diagnosis, and the differential diagnosis is broad. There is epilepsy, of course, but there are also metabolic disturbances, hypoglycemia, electrolyte abnormalities, intoxication or withdrawal, structural intracranial disease, infection, syncope with convulsive movements, psychogenic nonepileptic events, and a host of other possibilities. The interesting part of prehospital medicine is that you rarely have the luxury of immediately knowing which category you are dealing with. You have to take the information available, examine the patient, reconstruct what happened, and decide what matters now and what can safely wait until definitive evaluation at the hospital.

Somewhere amid all of that activity, I actually managed to eat lunch, which is a small miracle in both emergency medicine and surgery. Sadie had packed me a tuna salad croissant, and it was fantastic. There is a particular satisfaction in eating something someone you love prepared for you, especially when you have spent the morning bouncing between calls and station activity. Hospital food has its place, EMS station food has its traditions, and whatever happens to be shoved into your mouth between patients has its own category entirely, but a lunch made by Sadie wins. It was one of those small domestic moments that would probably be completely forgettable if you tried to describe it to someone else, yet somehow those are often the moments that make an otherwise busy day feel good.

By the time I finally headed home, I was tired in the pleasant way that comes from having actually done something with the day. The first thing I did when I got home was open every window in the house. We had one of those beautiful late-August evening breezes rolling through, and I wanted the entire house to breathe. There are certain evenings in New England when air-conditioning simply feels unnecessary, even after a warm day. The windows go open, the curtains move gently with the breeze, and the house takes on that unmistakable feeling of summer beginning its slow transition toward September. I love those evenings because they feel temporary. You know you only have so many of them left before the windows will be closed, the heat will come on, and the season will change whether you are ready for it or not.

The dogs were waiting, of course, and I took both of them outside and let them run loose across the property. Having sixty-five acres sounds wonderfully romantic until you actually own sixty-five acres and realize that every square foot of it is apparently sending you a personal invitation to perform some kind of maintenance. There is always something that needs to be mowed, trimmed, cleared, repaired, inspected, dragged, hauled, planted, cut back, or otherwise dealt with. I mowed the front lawn, collected the clippings and put them into the compost, then did some trimming around the property. I have long since accepted that maintaining this place is not a project with a beginning and an end. It is more like a recurring medical condition: chronic, incurable, occasionally exacerbated by weather, and requiring lifelong management.

Eventually, I decided I had done enough work for one evening and went down to the pond for a swim. The water was exactly what I needed after spending the afternoon working outside. The dogs, naturally, interpreted my decision to enter the pond as a personal invitation to join me. Every so often one of them would come bounding down and jump into the water, seemingly just to make sure I wasn’t enjoying myself too much without them. There is something wonderfully primitive about swimming in your own pond on a warm August evening while two dogs splash around nearby. No pager. No hospital. No operating room. No ambulance radio. Just water, trees, dogs, and the fading light.

Eventually I came back inside, took a shower, and discovered that the dogs were still somewhere outside doing whatever it is dogs do when they have sixty-five acres at their disposal. I didn’t worry about them. They know the property, and eventually they always come back when they hear the right sounds. In the meantime, I was approached by another member of the household who had decided that my attention was required.

Schnitzel.

Our orange tabby has always been something of a tyrant. He is not particularly interested in the democratic distribution of affection. He decides when he wants attention, how much attention he wants, and, most importantly, when you are going to provide it. Tonight he apparently concluded that I had been sufficiently occupied with dogs, yard work, swimming, EMS, and life in general and that his needs had been neglected. So he came looking for affection. Naturally, I obliged, because anyone who has ever lived with a cat understands the basic political structure of the arrangement. We do not own the cat. The cat owns the house, and we are simply employees with unusually elaborate responsibilities.

Then Sadie came home.

She arrived with pizza, which immediately improved the evening by several orders of magnitude, and announced that she wanted a movie night. I had absolutely no objection. We settled on The Wraith, which is exactly the sort of movie that makes sense when two physicians have spent the day working, have no desire to think particularly hard about anything, and want to watch something that belongs firmly to the cinematic ecosystem of the 1980s. There is something wonderful about sitting down with pizza and an old movie after a long day. It doesn’t require intellectual preparation, professional credentials, or a treatment algorithm. You just sit there, eat, watch, laugh at things that probably weren’t intended to be funny, and enjoy the nostalgia.

The dogs apparently heard Sadie come through the door because they materialized from wherever they had been roaming and came charging back to the house to greet her. Within minutes they were sprawled out in the living room, completely exhausted from their afternoon adventures. Sadie took a quick shower, and the house settled into that comfortable evening quiet that comes after a long day. The windows were still open, the breeze was moving through the rooms, the dogs were passed out, and for a moment everything felt exactly right.

Then Schnitzel decided that peace and tranquility had gone on long enough.

He began marching around the house as though conducting an inspection. This is another of his specialties. He patrols the premises with the solemnity of a building inspector and the temperament of a small dictator. At one point I opened the refrigerator and, apparently believing that this was an invitation specifically addressed to him, Schnitzel jumped inside. Not near the refrigerator. Not onto the counter. Into the refrigerator. He then refused to come out.

I told him to get out.

He ignored me.

I told him again.

He continued ignoring me.

I tried reasoning with him, which was obviously my first mistake. Eventually Sadie came over, took one look at the situation, reached into the refrigerator, grabbed the cat, and simply removed him from the premises. Schnitzel was not consulted regarding this decision. He was deposited back onto the floor with the unmistakable expression of a creature who had just been subjected to an outrageous violation of his civil liberties.

And now, finally, we are settling in. The pizza is here, the dogs are asleep, the windows are open, the evening breeze is moving through the house, Sadie is beside me, and The Wraith is about to start. It is a remarkably ordinary ending to a remarkably full day, which is precisely why I enjoy it. I spend enough of my professional life dealing with circumstances in which ordinary is the best possible outcome. Trauma surgery, critical care, and emergency medicine have a way of reminding you that normal life is not something to take for granted. Sometimes the best evening is simply one in which nothing particularly important happens.

If tonight were Friday, things might take a slightly different turn. We would probably end up doing some late-night swimming in the pond under the stars, because there are certain privileges that come with owning your own little piece of rural New England and having no neighbors close enough to complain. But tomorrow is still a workday for both of us, and adulthood, irritatingly enough, continues to impose obligations upon us. We have responsibilities. We have places to be. We have alarm clocks that will eventually ring again.

Fortunately, this weekend we are both off.

And we already have plans.

A 90s blockbuster movie weekend is waiting for us, which means there will probably be pizza, questionable cinematic decisions, an unreasonable amount of nostalgia, and at least one conversation about how movies somehow used to be better when cars had physical keys, cell phones were the size of bricks, and everyone apparently had a Blockbuster membership.

For tonight, though, this is enough. A good day at the station, four strange seizure calls, a tuna salad croissant from Sadie, sixty-five acres of yard work, a swim in the pond, two exhausted dogs, one deranged refrigerator cat, pizza, an old movie, and an open window letting August drift through the house.

Not a bad way to spend a day off.

The Breath That Follows the Heart: Understanding Cheyne-Stokes Respiration in Systolic Heart Failure

There is a peculiar rhythm that can appear in patients with advanced systolic heart failure, one that seems almost mechanical when observed from the bedside. Breathing gradually becomes deeper and faster, reaches a crescendo, and then progressively diminishes until ventilation becomes very shallow or briefly stops altogether. After the pause, the cycle begins again. To an untrained observer, it can look as though the patient is repeatedly forgetting to breathe and then remembering. To a physician, however, this waxing and waning pattern is a visible expression of a complicated interaction between the failing heart, the lungs, the brainstem respiratory centers, the circulation of carbon dioxide through the bloodstream, and the body’s remarkably sensitive system for regulating ventilation.

This pattern is known as Cheyne-Stokes respiration, and when it occurs in the setting of heart failure it is generally considered a form of central sleep apnea with a characteristic crescendo-decrescendo breathing pattern. Although it is most obvious during sleep, severe cases can produce recognizable periodic breathing while the patient is awake. The phenomenon is particularly associated with reduced left ventricular systolic function, although it is not exclusive to heart failure and can occur in other neurological and physiological conditions.

The most important concept to understand is that Cheyne-Stokes respiration in systolic dysfunction is not simply a consequence of the lungs “failing” to breathe properly. It is better understood as a problem of unstable respiratory control. The patient’s respiratory control system has become excessively sensitive to changes in carbon dioxide and oxygen, while the circulation has slowed the delivery of information from the lungs and blood to the brain. The feedback loop that normally keeps breathing remarkably stable begins to oscillate.

In ordinary circumstances, this feedback system is extraordinarily elegant. The brain continuously monitors the chemical consequences of metabolism, particularly carbon dioxide and hydrogen ion concentration, and adjusts ventilation accordingly. If carbon dioxide rises, ventilation increases. If carbon dioxide falls, ventilation decreases. The system normally damps out small fluctuations before they become clinically important. In certain patients with systolic heart failure, however, the feedback response becomes so sensitive that the system overshoots its target repeatedly. Ventilation increases too much, carbon dioxide falls too far, breathing subsequently stops, carbon dioxide rises again, and the cycle begins anew.

The result is a peculiar respiratory rhythm that is neither simply obstructive nor simply a failure of the respiratory muscles. It is a problem of control-system instability.

To understand why the failing heart can produce an abnormal breathing pattern, it is useful to begin with the anatomy of the system and then follow the physiology and biochemistry all the way from cellular metabolism to the sleeping patient at the bedside.

ANATOMY: The Respiratory Control System Is More Than the Lungs

When most people think about breathing, they understandably picture the lungs. The lungs, however, are only one component of the respiratory system. Breathing is an integrated process involving the brain, spinal cord, peripheral nerves, respiratory muscles, airways, lungs, pulmonary circulation, and cardiovascular system.

The process begins centrally in the brainstem, particularly within respiratory control networks in the medulla and pons. These structures contain groups of neurons that generate and modify the rhythmic neural activity responsible for breathing. They do not operate like a simple metronome. Instead, they integrate information from numerous chemical and mechanical sensors and continuously adjust the depth and frequency of ventilation.

The medulla contains important respiratory neuronal populations, including the dorsal and ventral respiratory groups and the pre-Bötzinger complex, which plays an important role in generating respiratory rhythm. The pons modifies the timing and pattern of respiration and helps coordinate the transition between inspiration and expiration.

The brainstem receives chemical information from two major sets of sensors. Central chemoreceptors, located in and around the medulla, are particularly sensitive to changes related to carbon dioxide through its effect on the hydrogen ion concentration of the cerebrospinal fluid. Peripheral chemoreceptors, principally in the carotid bodies and aortic bodies, respond to changes in arterial oxygen, carbon dioxide, and acidity.

The carotid bodies are especially important because they provide rapid information about arterial blood chemistry. They are located near the bifurcation of the common carotid arteries, strategically positioned to sample blood traveling toward the brain.

The respiratory muscles then translate the brain’s instructions into ventilation. The diaphragm is the principal muscle of inspiration. When it contracts, it descends and enlarges the thoracic cavity, creating negative intrathoracic pressure that draws air into the lungs. The external intercostal muscles contribute to expansion of the chest, while accessory muscles become increasingly important when respiratory demand rises.

The lungs themselves contain an enormous surface area of alveoli where oxygen and carbon dioxide move between the air and pulmonary capillary blood. Carbon dioxide generated throughout the body travels through the venous circulation to the lungs, where it is eliminated during expiration.

This entire apparatus is connected to the heart. The right ventricle sends venous blood through the pulmonary circulation, while the left ventricle receives oxygenated blood and ejects it into the systemic circulation. That circulation is not merely a delivery system for oxygen. It is also a communication network carrying carbon dioxide and other chemical information from metabolically active tissues to the lungs and from the lungs back toward the brain.

That last point becomes crucial in systolic heart failure.

PHYSIOLOGY: How Normal Breathing Is Controlled

At rest, breathing appears deceptively simple. We inhale, we exhale, and the cycle repeats. Underneath that apparent simplicity is a sophisticated feedback system designed to maintain arterial blood gases within a narrow physiological range.

The body continuously produces carbon dioxide as a consequence of cellular metabolism. Oxygen is consumed, carbon dioxide is generated, and both gases must be exchanged between tissues, blood, and atmosphere.

Carbon dioxide is particularly important in regulating ventilation. As arterial carbon dioxide rises, more carbon dioxide enters the cerebrospinal fluid. There it participates in chemical reactions that increase hydrogen ion concentration. Central chemoreceptors detect this change and stimulate the respiratory centers to increase ventilation.

The increased ventilation removes more carbon dioxide from the lungs. Arterial carbon dioxide falls, the stimulus to breathe diminishes, and ventilation decreases toward its baseline level.

This is a classic negative feedback system. The body detects a deviation from the desired state and generates a response that pushes the variable back toward normal.

Imagine a home thermostat. If the temperature falls below the programmed setting, the furnace turns on. Once the temperature returns toward the target, the furnace turns off. Under normal circumstances, the system is designed to prevent enormous swings in temperature.

Respiratory control works on a similar principle, except the variable being regulated is primarily the chemical environment of the body, particularly carbon dioxide and pH.

The system is not perfect, nor does it need to be. Small oscillations occur constantly. What matters is that normal physiological feedback mechanisms prevent those fluctuations from becoming large enough to destabilize breathing.

Cheyne-Stokes respiration occurs when that stability is lost.

THE CO2 APNEA THRESHOLD: The Invisible Line Beneath the Breathing Pattern

One of the most important concepts in understanding central sleep apnea is the apnea threshold, which refers to the level of carbon dioxide below which the respiratory drive can diminish sufficiently to produce apnea during sleep.

During wakefulness, behavioral and cortical influences help maintain respiratory activity. We can voluntarily breathe more deeply, speak, sing, cough, and temporarily alter our breathing pattern. During sleep, much of that behavioral control disappears, and automatic chemical control becomes increasingly important.

If a patient’s carbon dioxide falls below the level required to sustain automatic respiratory drive during sleep, central respiratory effort can temporarily cease.

This is not the same thing as airway obstruction. In obstructive sleep apnea, the brain continues attempting to breathe, but the upper airway collapses or becomes blocked. In central apnea, the respiratory drive itself temporarily diminishes or disappears, so there may be little or no respiratory effort during the pause.

The distinction is clinically important because the mechanisms are fundamentally different.

In systolic heart failure, patients can have a relatively small margin between their normal sleeping carbon dioxide level and the apnea threshold. This is sometimes described as a reduced CO2 reserve.

If the normal sleeping carbon dioxide concentration is only slightly above the level at which apnea occurs, even a modest increase in ventilation can push carbon dioxide below the threshold. Once that happens, central respiratory output falls, ventilation stops, carbon dioxide begins accumulating, and eventually the respiratory system is stimulated again.

The cycle then repeats.

WHY SYSTOLIC DYSFUNCTION MAKES THE SYSTEM UNSTABLE

The defining cardiovascular problem in systolic dysfunction is impaired ventricular contractility. The left ventricle cannot eject blood as effectively as a healthy ventricle, and cardiac output may be reduced.

The consequences extend far beyond the number displayed on an echocardiogram.

When cardiac output falls, the circulation takes longer to transport blood from the lungs and systemic tissues to the brain and back again. This creates a phenomenon known as circulatory delay.

That delay is central to the development of Cheyne-Stokes respiration.

The respiratory control centers in the brain are trying to determine whether ventilation is adequate by monitoring the chemical consequences of metabolism. But the information they receive is not instantaneous. Carbon dioxide generated by tissues must travel through the venous circulation to the lungs, undergo gas exchange, enter arterial blood, travel to the brain, and influence the respiratory control centers.

If circulation is slow, the time between a change in ventilation and the arrival of its chemical consequence at the brain becomes longer.

This creates a classic control-system problem.

Imagine steering a large ship using a control system that tells you what direction you were traveling several minutes ago rather than what direction you are traveling now. If you make a correction based upon delayed information, you may continue correcting after the ship has already begun responding. You then make another correction in the opposite direction, again based upon stale information. The result is oscillation.

The same principle applies to breathing.

The brain increases ventilation because carbon dioxide is perceived to be elevated. But by the time the chemical consequences of that increased ventilation reach the brain, the patient may already have eliminated a substantial amount of carbon dioxide. The respiratory system has effectively continued correcting based on yesterday’s weather.

The result can be overcorrection.

HIGH LOOP GAIN: When the Respiratory System Becomes Too Sensitive

Another important concept is loop gain.

In engineering, loop gain describes how strongly a control system responds to a disturbance. A system with low or moderate gain can correct a deviation without overshooting dramatically. A system with excessive gain can overcorrect and begin oscillating.

Respiratory control can behave in exactly this way.

In patients susceptible to Cheyne-Stokes respiration, the respiratory control system can have an excessively strong response to changes in carbon dioxide and oxygen. A small deviation produces a disproportionately large ventilatory response.

The patient develops a little extra carbon dioxide. The brain responds by increasing ventilation. Ventilation becomes excessive. Carbon dioxide falls below the apnea threshold. Breathing then ceases. Carbon dioxide rises again. The respiratory system responds vigorously, producing another period of hyperventilation.

This is the crescendo-decrescendo pattern seen in Cheyne-Stokes respiration.

Several physiological variables can contribute to increased loop gain, including heightened chemosensitivity, a narrow difference between resting carbon dioxide and the apnea threshold, circulatory delay, and instability in the relationship between ventilation and arterial blood gases.

Systolic heart failure can therefore transform an ordinarily stable respiratory feedback system into one that behaves more like an oscillating circuit.

THE CRESCENDO-DECRESCENDO PATTERN: What We Are Actually Seeing

The characteristic breathing pattern of Cheyne-Stokes respiration consists of a gradual increase in the depth and often frequency of breathing, followed by a gradual decrease, culminating in a period of central apnea or near-apnea.

The word “gradual” matters. This is not typically an abrupt switch from normal breathing to complete apnea and back again. The respiratory effort waxes and wanes.

During the crescendo phase, ventilation increases progressively. More carbon dioxide is removed from the bloodstream. As carbon dioxide falls, the respiratory stimulus eventually becomes inadequate, particularly if the patient’s carbon dioxide reserve is small.

The patient then enters the decrescendo phase. Respiratory effort becomes progressively shallower until central apnea occurs.

During the apneic interval, metabolism continues. Cells continue producing carbon dioxide, but ventilation is temporarily absent or profoundly reduced. Carbon dioxide therefore begins accumulating in the blood.

Eventually, carbon dioxide rises sufficiently to stimulate the respiratory centers again. Breathing resumes, often vigorously.

The cycle repeats.

What looks at the bedside like an almost poetic rise and fall in breathing is actually the visible output of a mathematical feedback system operating with excessive sensitivity and delayed information.

THE ROLE OF SLEEP

Sleep is an important part of this physiology because the transition from wakefulness to sleep changes respiratory control.

During wakefulness, breathing is influenced by conscious and behavioral inputs in addition to automatic metabolic control. We can consciously alter our ventilation, respond to discomfort, speak, move, and maintain breathing despite relatively small fluctuations in chemical stimuli.

During non-rapid-eye-movement sleep, behavioral influences diminish. Automatic chemical control becomes more dominant.

This matters in patients with systolic heart failure because their ventilatory control system may already be close to the instability threshold. Once the stabilizing influence of wakefulness is removed, the respiratory system can become more susceptible to oscillation.

Rapid-eye-movement sleep introduces another layer of complexity because respiratory patterns become more variable and muscle activity changes, but central sleep apnea associated with heart failure has traditionally been particularly prominent during non-REM sleep.

The important point is that sleep does not create the cardiovascular abnormality. It removes some of the physiological stabilizers that ordinarily help suppress the oscillation.

THE ROLE OF PULMONARY CONGESTION

Systolic heart failure often produces elevated left-sided filling pressures. Blood returning from the lungs encounters increased pressure in the left atrium and pulmonary venous circulation, and fluid can move into the pulmonary interstitium.

Pulmonary congestion can stimulate pulmonary receptors and alter respiratory mechanics. Fluid in the lungs can increase the work of breathing and influence the patient’s ventilatory pattern.

Pulmonary congestion is therefore part of the broader physiological environment in which Cheyne-Stokes respiration occurs, although it is important not to reduce the mechanism to pulmonary edema alone.

The fundamental abnormality remains instability of respiratory control. Pulmonary congestion can contribute to heightened ventilatory drive and altered respiratory mechanics, which can make the system more vulnerable to oscillation.

This is one reason patients with more advanced heart failure may demonstrate more prominent periodic breathing.

THE ROLE OF THE CHEMORECEPTORS

Chemoreceptors are the body’s chemical surveillance system.

The central chemoreceptors are particularly responsive to changes in the chemical environment produced by carbon dioxide. Carbon dioxide crosses the blood-brain barrier readily, and its conversion into carbonic acid and hydrogen ions alters the pH of the cerebrospinal fluid.

The peripheral chemoreceptors in the carotid and aortic bodies respond to arterial oxygen, carbon dioxide, and pH. They are particularly important when oxygen falls substantially, but they also participate in the response to carbon dioxide and acidity.

In heart failure, heightened chemosensitivity can contribute to respiratory instability. The respiratory system becomes more reactive to changes in blood gases, increasing the likelihood that a relatively small perturbation will produce an exaggerated ventilatory response.

The body is therefore not failing to detect the chemical signal. In an important sense, it is detecting it too enthusiastically.

That is an important distinction. Cheyne-Stokes respiration is not simply a respiratory control system that has become too weak. It is, in many patients, a respiratory control system that has become excessively reactive.

BIOCHEMISTRY: Carbon Dioxide, Water, and Hydrogen Ions

The biochemical relationship between carbon dioxide and pH is at the center of respiratory control.

Carbon dioxide combines with water to form carbonic acid, a reaction facilitated by the enzyme carbonic anhydrase. Carbonic acid can dissociate into hydrogen ions and bicarbonate:

CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻

This equilibrium is fundamental to acid-base physiology.

When carbon dioxide rises, hydrogen ion concentration increases and pH falls. When carbon dioxide falls, hydrogen ion concentration decreases and pH rises.

The brainstem respiratory centers are exquisitely sensitive to these changes, particularly through the effect of carbon dioxide on cerebrospinal fluid chemistry.

Ventilation is therefore one of the body’s principal mechanisms for regulating acid-base balance. The lungs can change carbon dioxide concentration rapidly, whereas the kidneys regulate bicarbonate and acid excretion over much longer time scales.

This biochemical relationship explains why excessive ventilation can destabilize breathing. If a patient hyperventilates sufficiently, carbon dioxide falls. The resulting reduction in hydrogen ion concentration diminishes the chemical stimulus to breathe.

In a patient whose carbon dioxide is already near the apnea threshold, a relatively modest reduction can be enough to suppress central respiratory output during sleep.

The biochemical system is therefore tightly coupled to the neurological control system. Carbon dioxide is not merely a waste product. It is also one of the principal chemical signals governing ventilation.

WHY LOW CO2 CAN BE MORE IMPORTANT THAN HIGH CO2

It is tempting to think of central apnea as a failure to eliminate carbon dioxide. In the setting of Cheyne-Stokes respiration associated with heart failure, the initial problem may actually be excessive elimination of carbon dioxide.

The patient begins to hyperventilate. Minute ventilation exceeds metabolic carbon dioxide production. Arterial carbon dioxide falls.

If it falls below the apnea threshold, the respiratory drive decreases substantially during sleep.

The patient stops breathing.

During the pause, carbon dioxide rises again until it crosses the threshold required to restart ventilation.

The patient then hyperventilates, sometimes dramatically, and the process repeats.

This distinction separates many cases of heart-failure-associated central sleep apnea from chronic hypoventilation syndromes in which carbon dioxide is persistently elevated.

The patient may therefore oscillate between relative hypocapnia and subsequent carbon dioxide accumulation rather than simply remaining chronically hypercapnic.

THE CIRCULATORY DELAY IN GREATER DETAIL

The circulation normally acts as a rapid communication pathway between the lungs, heart, tissues, and brain. When the heart pumps effectively, changes in ventilation are translated into changes in arterial blood gases relatively quickly.

Reduced cardiac output slows this communication.

Blood must travel from the lungs through the left heart and systemic arteries to the brain. Carbon dioxide generated by tissues must return through the venous circulation to the right heart and lungs before being eliminated.

A patient with severe systolic dysfunction may therefore have a substantial delay between a change in ventilation and the corresponding change in the chemical stimulus sensed by the respiratory centers.

This creates a dangerous situation for feedback control because the respiratory centers are responding to information that represents an earlier physiological state.

Suppose carbon dioxide begins to rise. The respiratory system increases ventilation. But the brain does not immediately see the full effect of that increased ventilation. It continues to receive information suggesting that carbon dioxide remains elevated. Ventilation therefore continues to increase.

By the time the brain finally receives the updated information, carbon dioxide may have fallen substantially below the desired level.

The respiratory response then reverses.

The system has overshot.

The delay is therefore not merely an incidental consequence of heart failure. It is one of the fundamental mechanisms that allows the respiratory feedback loop to oscillate.

WHY THE BREATHING PATTERN CAN BE SO REGULAR

The striking regularity of Cheyne-Stokes respiration can seem mysterious until the underlying feedback system is understood.

A delayed negative-feedback system with excessive gain naturally tends to oscillate.

The same principle appears in many engineered systems. If a thermostat responds too aggressively and receives delayed temperature information, it can repeatedly alternate between heating and cooling. If a driver turns the steering wheel too far in response to delayed information about the vehicle’s position, the car can weave from side to side.

The respiratory system is performing a similar task, although with considerably more sophisticated biology.

The target variable is the chemical environment of the body. The sensor is the chemoreceptor system. The controller is the brainstem. The actuator is the respiratory musculature. The lungs are the gas-exchange apparatus. The bloodstream is the communication pathway.

In systolic heart failure, the communication pathway becomes slower, the controller becomes more sensitive, and the margin between normal breathing and apnea may become smaller.

Under those conditions, oscillation becomes much more likely.

WHY CHEYNE-STOKES RESPIRATION IS A MARKER OF HEART FAILURE SEVERITY

Cheyne-Stokes respiration is often associated with more advanced cardiovascular disease, particularly reduced left ventricular systolic function. Its presence reflects the interaction between cardiac output, circulatory delay, pulmonary congestion, autonomic activity, and respiratory chemosensitivity.

It is not, however, a simple one-to-one marker of ejection fraction. Two patients with identical ejection fractions may have very different degrees of respiratory instability, and some patients with substantial systolic dysfunction will never develop prominent Cheyne-Stokes respiration.

This is an important reminder that ejection fraction is only one variable within the cardiovascular system.

A patient can have a particular ejection fraction while possessing a very different cardiac output, filling pressure, autonomic state, pulmonary vascular physiology, chemosensitivity, and metabolic environment than another patient with the same numerical value.

Cheyne-Stokes respiration reflects the behavior of the entire cardiorespiratory control system.

CHEYNE-STOKES RESPIRATION VERSUS OBSTRUCTIVE SLEEP APNEA

The distinction between central and obstructive sleep apnea is fundamental.

In obstructive sleep apnea, the brain continues generating respiratory effort, but the upper airway becomes partially or completely obstructed. The chest and abdomen may continue moving as the patient attempts to inhale against the obstruction.

In central sleep apnea, there is a temporary reduction or absence of the neural drive to breathe, so respiratory effort itself decreases or disappears.

Cheyne-Stokes respiration associated with heart failure is characterized by central apneas embedded within the crescendo-decrescendo breathing pattern.

Patients can, of course, have both obstructive and central sleep apnea. Real human physiology is rarely obliged to select one mechanism and politely ignore the others.

The distinction matters because the underlying physiology and appropriate clinical evaluation differ.

THE AUTONOMIC NERVOUS SYSTEM AND HEART FAILURE

Heart failure activates the sympathetic nervous system because the body perceives reduced effective circulation as a threat to organ perfusion.

Sympathetic activation increases heart rate, contractility, and vascular tone. In the short term, these mechanisms help maintain circulation. Chronically, however, excessive sympathetic activation becomes maladaptive and contributes to cardiovascular remodeling and disease progression.

Autonomic activation can also influence breathing. The respiratory control system and cardiovascular autonomic system are closely interconnected, and increased sympathetic activity can contribute to ventilatory instability.

This creates another feedback relationship: reduced cardiac function increases neurohormonal activation; neurohormonal activation changes cardiovascular and respiratory physiology; altered respiratory patterns influence oxygen and carbon dioxide levels; and those changes feed back into cardiovascular and autonomic regulation.

Cheyne-Stokes respiration is therefore not a problem confined to the respiratory system. It is a manifestation of the interaction between two systems that are biologically inseparable.

WHAT THE PATIENT MAY EXPERIENCE

Some patients are completely unaware of their Cheyne-Stokes breathing because it occurs primarily during sleep. A bed partner may be the first person to notice that breathing gradually becomes deeper and faster, then progressively shallower, followed by a pause.

The patient may awaken repeatedly because of fluctuations in respiratory drive and blood gases. Sleep becomes fragmented, and daytime fatigue may develop.

Some patients report paroxysmal nocturnal dyspnea or awakenings with a sensation of air hunger, although these symptoms can also result directly from pulmonary congestion.

In severe disease, the patient may demonstrate periodic breathing even while awake, particularly during quiet rest. The pattern can become visible during an ordinary clinical examination.

The presence of periodic breathing should therefore prompt consideration of the patient’s cardiovascular status, particularly when systolic heart failure is already known.

WHY THE PATTERN CAN CHANGE WITH POSITION AND TREATMENT OF HEART FAILURE

The severity of Cheyne-Stokes respiration can vary according to the patient’s cardiovascular and respiratory state. Changes in cardiac output, pulmonary congestion, oxygenation, metabolic state, sleep stage, and medications can all influence ventilatory stability.

As heart failure improves and cardiac output increases, circulatory delay may decrease. If pulmonary congestion improves and filling pressures fall, the respiratory system may also become less stimulated. Neurohormonal activation may diminish as effective circulation improves.

These changes can reduce the tendency toward periodic breathing in some patients.

Conversely, worsening systolic dysfunction can increase the physiological conditions that favor respiratory instability.

This is another reason the breathing pattern can provide clinically useful information. It is not a diagnostic instrument in isolation, but it can be an observable expression of changing cardiorespiratory physiology.

THE ROLE OF OXYGEN

Oxygen is also involved in the respiratory control system, particularly through the peripheral chemoreceptors.

A decline in arterial oxygen can stimulate ventilation through the carotid and aortic bodies. In heart failure, pulmonary congestion and ventilation-perfusion abnormalities can contribute to intermittent reductions in oxygenation.

Hypoxemia can therefore interact with the carbon dioxide-driven control system and further destabilize breathing.

However, oxygen is not the fundamental explanation for Cheyne-Stokes respiration. The characteristic pattern in systolic heart failure is better understood as the product of unstable ventilatory control, excessive chemosensitivity, low carbon dioxide reserve, and prolonged circulatory delay.

Oxygen fluctuations are one component of a much larger physiological network.

THE IMPORTANCE OF THE LEFT VENTRICLE

Because systolic dysfunction is frequently associated with reduced left ventricular function, the left ventricle deserves particular attention.

The left ventricle receives oxygenated blood from the left atrium and ejects it into the systemic circulation. When its contractile function is impaired, stroke volume and cardiac output can fall.

Blood may consequently accumulate upstream, increasing left atrial and pulmonary venous pressures. The lungs become congested, and the cardiovascular system activates compensatory neurohormonal mechanisms.

At the same time, reduced forward flow slows circulation.

Thus, the failing left ventricle can contribute to Cheyne-Stokes respiration through at least two major pathways: hemodynamic consequences that produce circulatory delay and pulmonary congestion, and systemic consequences that alter neurohumoral and respiratory control.

The heart and respiratory system are therefore participating in a shared feedback loop.

A CONTROL-SYSTEM VIEW OF THE ENTIRE PROCESS

Perhaps the clearest way to understand Cheyne-Stokes respiration is to stop thinking about it as an isolated breathing abnormality and instead imagine the entire cardiorespiratory system as a feedback-control circuit.

The tissues continuously produce carbon dioxide. Venous blood carries that carbon dioxide toward the lungs. The lungs eliminate it. Arterial blood then carries the resulting chemical information toward the brain. Chemoreceptors detect changes in carbon dioxide, oxygen, and acidity. The brainstem adjusts respiratory drive. Respiratory muscles change ventilation. The lungs then alter the blood gases again.

Under normal circumstances, this loop is stable.

In systolic heart failure, several components can change simultaneously. Cardiac output decreases, increasing circulatory delay. Pulmonary congestion increases ventilatory stimulation. Chemosensitivity may increase. The patient’s carbon dioxide reserve may become smaller. Sleep removes some behavioral stabilization of breathing.

The system now has all the ingredients necessary for oscillation.

Ventilation increases.

Carbon dioxide falls.

The patient crosses the apnea threshold.

Central respiratory drive decreases.

Breathing stops or becomes extremely shallow.

Carbon dioxide rises.

The respiratory drive returns.

Ventilation increases excessively again.

The cycle repeats.

The crescendo and decrescendo are simply the visible signature of this unstable feedback loop.

WHY THIS MATTERS CLINICALLY

Cheyne-Stokes respiration should never be dismissed merely as an oddity of sleep. In a patient with systolic dysfunction, it can indicate substantial physiological disturbance and may be associated with more advanced heart failure and adverse clinical outcomes.

At the same time, it should not be interpreted simplistically as proof that a patient is “about to die.” Medicine does not provide that kind of certainty from a single observation.

The appropriate response is to understand the physiology and evaluate the patient in context. The presence of periodic breathing may prompt assessment of heart failure severity, volume status, oxygenation, sleep-disordered breathing, medications, metabolic abnormalities, and other contributors.

The clinician must also distinguish true Cheyne-Stokes respiration from other causes of irregular breathing. Neurological disorders, sedative medications, high altitude, metabolic disturbances, and other conditions can produce central respiratory abnormalities.

The breathing pattern is therefore a clue to physiology, not a diagnosis that exists independently of the patient.

THE PARADOX OF A SYSTEM DESIGNED TO PROTECT THE PATIENT

There is a certain elegance, and perhaps a certain cruelty, in the physiology.

The respiratory system is trying to protect the patient.

When carbon dioxide rises, it increases ventilation. When carbon dioxide falls, it reduces ventilation. The system is behaving exactly as it was designed to behave.

The problem is that in severe systolic dysfunction, the feedback loop becomes unstable.

The brain receives delayed information. The chemoreceptors may be unusually sensitive. The patient’s carbon dioxide reserve may be narrow. Ventilation overshoots. Carbon dioxide falls too far. The system responds again, but now in the opposite direction.

Nothing is fundamentally “wrong” with the intention of the respiratory controller. The problem lies in the dynamics of the system in which it is operating.

This distinction is important because it illustrates a recurring theme in medicine: a physiological mechanism that is beneficial under ordinary conditions can become maladaptive when the surrounding system changes.

The same sympathetic activation that saves blood pressure in acute blood loss can become harmful in chronic heart failure. The same fluid-retention mechanisms that protect circulation during dehydration can produce edema in heart failure. The same respiratory chemoreflexes that maintain acid-base balance can generate oscillatory breathing when feedback becomes unstable.

Physiology is rarely good or bad in isolation. It depends upon context.

A FINAL LOOK AT THE BEDSIDЕ PATIENT

Imagine sitting beside a patient with severe systolic heart failure while he sleeps. His breathing begins quietly, then gradually becomes deeper. The respiratory rate increases. The breaths become increasingly pronounced before gradually diminishing again. The chest movement becomes shallow, and for a period there is almost no respiratory effort. Carbon dioxide continues to be generated by metabolism during the pause. Eventually the respiratory drive returns, and the patient begins breathing again, initially more forcefully than before.

Seen without context, it is simply an unusual breathing pattern.

Seen through physiology, it is a conversation between the failing heart and the respiratory centers of the brain.

The heart’s reduced output has slowed the circulation. The delayed circulation has slowed the delivery of chemical information. The respiratory control system has become excessively responsive. Carbon dioxide has fallen below the threshold required to maintain breathing during sleep. The respiratory muscles have temporarily quieted. Carbon dioxide has accumulated again. The brainstem has detected the change and restarted ventilation.

The cycle continues because the control system has become an oscillator.

That is Cheyne-Stokes respiration.

Conclusion: When the Heart Changes the Rhythm of Breathing

Cheyne-Stokes respiration in systolic dysfunction is one of those physiological phenomena that becomes considerably less mysterious once the individual pieces are placed together. It is not simply “abnormal breathing during sleep,” and it is not adequately explained by saying that a weak heart causes the patient to stop breathing.

The mechanism is considerably more elegant.

Reduced left ventricular systolic function can decrease cardiac output and prolong circulation time. The resulting circulatory delay means that changes in ventilation take longer to be reflected in the chemical environment sensed by the brain. At the same time, patients with heart failure may have increased chemosensitivity, a reduced carbon dioxide reserve, pulmonary congestion, heightened ventilatory drive, and other alterations that increase the loop gain of the respiratory control system.

During sleep, when behavioral influences on breathing are diminished, the system becomes particularly vulnerable to instability. Ventilation increases excessively, carbon dioxide falls below the apnea threshold, central respiratory drive decreases, breathing becomes shallow or ceases, carbon dioxide accumulates, and respiratory drive returns. Ventilation then increases again, often overshooting the physiological requirement. The cycle produces the characteristic crescendo-decrescendo pattern.

At the molecular level, the story ultimately comes back to carbon dioxide, water, hydrogen ions, and the chemistry of acid-base balance. At the neurological level, it involves brainstem respiratory networks and chemoreceptors. At the cardiovascular level, it involves impaired systolic function, reduced forward flow, pulmonary congestion, and delayed circulation. At the systems level, it is a problem of feedback control.

That is what makes Cheyne-Stokes respiration so fascinating from a physician’s perspective. The patient is not merely demonstrating a respiratory abnormality. The breathing pattern is effectively revealing the behavior of the cardiovascular and respiratory control systems in real time.

The body is constantly measuring itself, responding to itself, correcting itself, and then correcting those corrections. In a healthy person, these feedback loops are so well calibrated that we barely notice them. In severe systolic dysfunction, the machinery becomes visible. The slowed circulation, heightened chemosensitivity, altered carbon dioxide physiology, and unstable respiratory drive announce themselves through the patient’s breathing.

What appears to be an irregularity in respiration is therefore a remarkably sophisticated physiological message. The heart has changed the circulation, the circulation has changed the timing of information reaching the brain, and the brain has changed the rhythm of breathing.

Understanding that sequence is more than an academic exercise. It is a reminder that the human body is not a collection of independent organs but a single interconnected system, in which the failure of one organ can quietly alter the behavior of another. In Cheyne-Stokes respiration, the failing heart does not merely struggle to circulate blood. It changes the timing of the body’s internal conversation, and eventually we can hear that altered conversation in every breath.

The Vitamin the Body Cannot Afford to Lose: Understanding Thiamine Deficiency

There are certain nutritional deficiencies that sound almost quaint when we encounter them in medical school, diseases that seem to belong to an earlier century when sailors suffered from scurvy, children developed rickets, and entire populations could become ill because a staple food had been processed in a particular way. Thiamine deficiency can initially seem to belong in that same historical category. After all, thiamine, or vitamin B1, is a small water-soluble vitamin that most people obtain routinely from an ordinary diet. Yet thiamine deficiency remains a clinically important problem, and when the deficiency becomes severe, it can produce neurologic disease, cardiovascular collapse, profound metabolic disturbances, and permanent disability or death.

What makes thiamine deficiency particularly fascinating is that the vitamin itself is required in very small quantities, while the biological consequences of not having enough of it can be enormous. Thiamine participates in the biochemical machinery responsible for converting nutrients into usable cellular energy. It helps the body process carbohydrates and several other metabolic substrates, and tissues with high energy requirements are especially vulnerable when thiamine becomes scarce. The brain depends upon a continuous supply of energy to maintain electrical activity, neuronal signaling, and cellular integrity. The heart requires enormous amounts of ATP to contract continuously. Skeletal muscles require energy for movement. Peripheral nerves require energy to maintain axonal function and cellular transport. When thiamine-dependent metabolic pathways fail, these tissues begin to suffer.

The resulting disease can therefore look remarkably different depending upon which tissues are most affected. One patient may present with peripheral neuropathy and profound weakness. Another may develop confusion, abnormal eye movements, and difficulty walking from Wernicke encephalopathy. Another may present with edema, tachycardia, lactic acidosis, and high-output heart failure from wet beriberi. These are not necessarily unrelated diseases. They can be different clinical expressions of the same fundamental biochemical problem.

From my perspective as a physician, thiamine deficiency is a particularly valuable condition to understand because it reminds us that nutrition is not simply about calories, body weight, or whether someone appears well fed. Nutrition is biochemistry made visible. Every cell requires specific molecules to carry out the reactions necessary for life, and sometimes the absence of one small molecule can disrupt an astonishingly large physiological system. Thiamine is one of those molecules.

What Is Thiamine?

Thiamine is vitamin B1, a water-soluble vitamin that humans cannot manufacture in sufficient quantities and therefore must obtain from food. It is found in foods such as whole grains, enriched and fortified grain products, legumes, nuts, seeds, pork, and other meats. In many countries, food fortification makes severe deficiency considerably less common than it once was, but fortification does not make deficiency impossible.

The body stores only relatively modest quantities of thiamine, particularly compared with substances that can be stored extensively in adipose tissue. This limited reserve is one reason prolonged inadequate intake can eventually become clinically significant. The time required to develop deficiency varies with the individual’s nutritional status, metabolic demands, and existing body stores, but the general principle is straightforward: the body cannot simply place an enormous reserve of thiamine on a shelf and forget about it.

Thiamine is absorbed primarily through the gastrointestinal tract and is then converted into several phosphorylated forms. The most important biologically active form is thiamine pyrophosphate, also called thiamine diphosphate. This active coenzyme participates in several enzymatic reactions central to energy metabolism.

That phrase, “energy metabolism,” can sound abstract, so it is worth translating it into ordinary language. Every cell in the body requires a usable form of energy to survive. The food we eat contains chemical energy, but cells cannot simply take a bite of bread or a piece of steak and use it to power a heartbeat or transmit a nerve impulse. Nutrients must first be broken down and processed through elaborate biochemical pathways. Thiamine is one of the components that allows several of those pathways to function.

When thiamine becomes severely deficient, the problem is therefore not merely that the patient has “low vitamin levels.” The machinery that converts nutrients into cellular energy begins to malfunction.

ANATOMY: Where Thiamine Deficiency Does Its Damage

Thiamine deficiency does not injure one single organ in one single location. Its effects are distributed throughout the body, but several tissues are particularly vulnerable because of their dependence upon continuous energy production.

The central nervous system is one of the most important targets. The brain contains billions of neurons that communicate through electrical and chemical signals. Maintaining these signals requires enormous amounts of energy. Neurons must preserve ion gradients across their cell membranes, manufacture neurotransmitters, transport proteins and cellular components along axons, and maintain the structural integrity of their membranes and synapses. There is little tolerance for prolonged interruption of energy metabolism.

Certain regions of the brain are particularly susceptible to severe thiamine deficiency. Wernicke encephalopathy classically involves structures including the mammillary bodies, medial thalami, periaqueductal region, and areas around the third and fourth ventricles. The clinical consequences can include altered mental status, abnormalities of eye movement, and gait or coordination difficulties. Importantly, the classic triad is not present in every patient, which is one reason Wernicke encephalopathy can be missed.

The peripheral nervous system is also vulnerable. Peripheral nerves consist of axons extending from nerve cell bodies, surrounded in many locations by myelin and supported by specialized cells. Maintaining these long cellular structures requires substantial energy. Thiamine deficiency can produce a predominantly peripheral neuropathy characterized by weakness, sensory abnormalities, pain, and impaired reflexes. This constellation is traditionally associated with dry beriberi.

The heart is another major target because cardiac muscle is among the most metabolically active tissues in the body. Cardiomyocytes contain abundant mitochondria and require continuous ATP production to contract and relax. A heart that beats tens of millions of times each year cannot afford prolonged disruption of its energy supply.

The cardiovascular system also includes the vascular network, particularly the small arteries and arterioles that regulate systemic vascular resistance. Severe thiamine deficiency can produce peripheral vasodilation and a hyperdynamic circulation, contributing to wet beriberi and high-output heart failure.

The skeletal muscles can also be affected. Muscle contraction requires ATP, and severe deficiency can therefore contribute to weakness and exercise intolerance. The gastrointestinal tract, liver, kidneys, and other tissues are also involved indirectly because they participate in nutrient absorption, metabolism, and fluid regulation.

The anatomy of thiamine deficiency is therefore best understood as a map of the body’s most metabolically demanding systems rather than a single diseased organ.

PHYSIOLOGY: How the Body Normally Uses Thiamine

To understand what goes wrong, we first need to understand what normally happens.

After food is consumed, carbohydrates, fats, and proteins are broken down into smaller molecules that can be absorbed and transported into cells. Glucose is particularly important because it is a major energy substrate for many tissues and is especially important to the brain under ordinary physiological circumstances.

Glucose initially undergoes glycolysis, a sequence of reactions occurring in the cytoplasm that ultimately produces pyruvate. Pyruvate then has an important decision to make, metabolically speaking. Under normal aerobic conditions, it enters mitochondria and is converted to acetyl-CoA through a reaction catalyzed by the pyruvate dehydrogenase complex.

This is one of the major places where thiamine becomes essential.

Thiamine pyrophosphate is required for the E1 component of the pyruvate dehydrogenase complex. Without adequate thiamine, pyruvate cannot be efficiently directed into this pathway. Instead, more pyruvate may be converted into lactate.

Acetyl-CoA normally enters the citric acid cycle, sometimes called the Krebs cycle or tricarboxylic acid cycle. The cycle generates molecules that carry high-energy electrons to the mitochondrial electron transport chain. Those electrons ultimately support oxidative phosphorylation, producing ATP.

Thiamine is also required for alpha-ketoglutarate dehydrogenase, another important enzyme within the citric acid cycle. In addition, thiamine-dependent transketolase participates in the pentose phosphate pathway, which contributes to nucleotide synthesis and cellular redox balance.

The overall picture is therefore one of a metabolic network rather than a single isolated reaction. Thiamine participates at several important junctions.

A useful analogy is to imagine a large transportation network. Glucose and other nutrients are the raw materials entering the city. Glycolysis is one of the major roads. The mitochondria are the power plants. The citric acid cycle is part of the fuel-processing system. The electron transport chain is the machinery that ultimately produces usable energy. Thiamine is not the fuel itself; it is more like a critical component required by several pieces of the processing equipment. If that component disappears, traffic begins to back up at multiple intersections.

That is why the clinical consequences of deficiency can be so extensive.

BIOCHEMISTRY: The Molecular Problem Behind the Disease

The biochemical core of thiamine deficiency is impairment of enzymes that require thiamine pyrophosphate as a cofactor.

The pyruvate dehydrogenase complex is particularly important. It links glycolysis to mitochondrial oxidative metabolism by converting pyruvate into acetyl-CoA. When this pathway is impaired, pyruvate accumulates and is increasingly converted into lactate.

This can produce lactic acidosis, particularly when thiamine deficiency is severe and the patient is simultaneously experiencing increased metabolic stress. Elevated lactate is therefore an important clue in the appropriate clinical context, although lactate is nonspecific and can rise for many other reasons.

The alpha-ketoglutarate dehydrogenase complex is another thiamine-dependent enzyme. Impairment here disrupts the citric acid cycle and further compromises oxidative energy production.

Transketolase, another thiamine-dependent enzyme, participates in the pentose phosphate pathway. This pathway is important for generating ribose-5-phosphate for nucleotide synthesis and NADPH for cellular redox processes. Severe thiamine deficiency can therefore influence cellular functions beyond simply ATP generation.

At the cellular level, inadequate thiamine means that certain metabolic reactions cannot proceed normally. This is especially dangerous in tissues where energy requirements are continuous and substantial.

The brain is a perfect example. Neurons maintain electrochemical gradients through ATP-dependent ion pumps. If ATP production becomes inadequate, membrane potentials become unstable, neurotransmission becomes impaired, and eventually cellular injury can occur.

The heart presents a similar problem. Cardiomyocytes need ATP for actin-myosin cross-bridge cycling, calcium reuptake into the sarcoplasmic reticulum, maintenance of ion gradients, and numerous other cellular processes. A metabolic bottleneck therefore has consequences that extend directly into mechanical cardiac function.

This is why the biochemical diagnosis and the clinical diagnosis are inseparable. The patient is not simply missing a vitamin. The patient is missing a molecule required to make several critical metabolic reactions work.

How Thiamine Deficiency Develops

There is rarely a single universal cause. Thiamine deficiency develops when intake, absorption, utilization, or requirements become sufficiently abnormal that the body’s available supply cannot meet physiological needs.

Inadequate dietary intake is the most straightforward mechanism. Severe food insecurity, prolonged restrictive diets, anorexia associated with illness, and other circumstances that substantially reduce nutritional intake can lead to deficiency.

Alcohol use disorder is a classic risk factor and deserves particular attention, although it is important not to oversimplify the relationship. Chronic heavy alcohol exposure can be associated with poor nutritional intake, impaired intestinal absorption of thiamine, altered storage and metabolism, and other physiological changes that increase vulnerability. The diagnosis should therefore be based on the clinical picture rather than on stereotypes about who “looks” malnourished.

Gastrointestinal disease and surgery can also interfere with nutrient absorption. Patients with certain bariatric procedures, chronic gastrointestinal disorders, or prolonged vomiting may have difficulty obtaining or absorbing adequate thiamine.

Increased metabolic demand can be important as well. Severe systemic illness can alter nutritional requirements, and a patient with marginal thiamine stores may become clinically deficient when metabolic demands increase.

There are also circumstances in which patients receive substantial amounts of carbohydrate while having inadequate thiamine availability. Because carbohydrate metabolism depends heavily upon thiamine-dependent enzymes, this can precipitate or worsen manifestations of deficiency in susceptible patients.

The common thread is that thiamine deficiency occurs when the body’s requirement for functional thiamine exceeds what is available.

Dry Beriberi: When the Nervous System Bears the Cost

Dry beriberi primarily describes the neurologic manifestations of thiamine deficiency. The patient may develop a peripheral neuropathy characterized by weakness, numbness, burning or painful sensations, impaired reflexes, and difficulty walking.

The neuropathy can be symmetric and may involve the legs more prominently. Weakness can become substantial, and patients may initially attribute their symptoms to fatigue, aging, alcohol exposure, or another chronic condition.

The neurological abnormalities reflect the vulnerability of peripheral nerves to impaired energy metabolism. Long axons require substantial cellular transport and maintenance, and these processes depend upon ATP. When energy production becomes inadequate, axonal integrity and nerve conduction can deteriorate.

Severe deficiency can therefore transform what initially seems like nonspecific weakness or numbness into a significant neurological disability.

Wernicke Encephalopathy: The Brain’s Emergency

Perhaps the most clinically important neurologic consequence of thiamine deficiency is Wernicke encephalopathy. This is an acute neurologic syndrome caused by thiamine deficiency and is a medical emergency because delayed treatment can result in permanent neurological injury.

The classic teaching describes three major manifestations: altered mental status, abnormalities of eye movement, and gait ataxia. The difficulty is that many patients do not display all three.

A patient may simply appear confused, inattentive, lethargic, or disoriented. Another may have abnormal eye movements or double vision. Another may be unable to walk normally. In critically ill or hospitalized patients, these findings can easily be attributed to medications, infection, metabolic abnormalities, intoxication, withdrawal, or other causes of encephalopathy.

This is why clinical suspicion matters. Laboratory confirmation may not be immediately available, and treatment should not be delayed when the clinical circumstances strongly suggest thiamine deficiency.

If Wernicke encephalopathy is not recognized, some patients can progress to persistent cognitive impairment, including Korsakoff syndrome, characterized by profound memory disturbance and difficulties with learning and recall.

The distinction between Wernicke encephalopathy and Korsakoff syndrome is clinically useful, but they are best understood as part of a spectrum of neurologic injury related to severe thiamine deficiency.

Wet Beriberi: When Thiamine Deficiency Attacks the Circulation

Wet beriberi is the cardiovascular manifestation of thiamine deficiency and is particularly important because it can produce high-output heart failure.

The central physiological abnormality is a hyperdynamic circulation associated with decreased systemic vascular resistance. Peripheral vasodilation reduces the resistance against which the heart must pump. The body responds by increasing cardiac output through tachycardia and increased stroke volume.

At first, this response is compensatory. But the increased cardiac output requires sustained myocardial work, while the patient may simultaneously have impaired cellular energy metabolism. The kidneys also respond to the altered circulation by activating mechanisms that retain sodium and water.

As intravascular volume expands, venous return increases. Cardiac filling pressures rise, and fluid moves into tissues. Peripheral edema becomes prominent, and pulmonary congestion can develop.

The result is the paradox of high-output heart failure: the heart is pumping a large amount of blood, but the circulation remains physiologically inadequate and congested.

Severe cardiovascular beriberi can progress to Shoshin beriberi, a fulminant syndrome involving profound cardiovascular instability, lactic acidosis, tachycardia, edema, hypotension, and potentially shock.

This is a particularly important diagnosis because the presentation can mimic sepsis, cardiogenic shock, myocarditis, or other critical illnesses. Recognizing the underlying nutritional and metabolic context can change treatment dramatically.

Why High Cardiac Output Does Not Mean the Heart Is Healthy

This point deserves emphasis because it contradicts a common intuitive understanding of heart failure.

Cardiac output is the amount of blood the heart pumps each minute. It is not synonymous with effective tissue perfusion, nor does a high number automatically mean that the cardiovascular system is functioning normally.

A high-output state occurs when the body requires unusually high blood flow or when systemic vascular resistance has become abnormally low. The heart compensates by increasing its output.

The relationship can be expressed approximately as:

Mean arterial pressure ≈ cardiac output × systemic vascular resistance.

If systemic vascular resistance falls dramatically, cardiac output must rise if arterial pressure is to be maintained.

In wet beriberi, the cardiovascular system may therefore be caught in a cycle in which vascular resistance falls, cardiac output rises, renal sodium retention increases circulating volume, venous pressures rise, and congestion worsens.

The pump is doing more work because the plumbing has changed.

That is an important conceptual distinction, because treating every heart failure patient as though the heart itself is simply too weak can obscure the actual disease mechanism.

Other Causes of High-Output Heart Failure

Thiamine deficiency is an important cause of high-output heart failure, but it is not the only one.

Severe anemia can produce high-output physiology because blood with a very low hemoglobin concentration carries less oxygen per unit volume. The cardiovascular system compensates by increasing blood flow.

Hyperthyroidism can increase metabolic demand and alter vascular tone, resulting in increased cardiac output.

Large arteriovenous fistulas or shunts can allow blood to bypass portions of the normal high-resistance microcirculation, lowering systemic vascular resistance and increasing venous return.

Advanced liver disease can produce a hyperdynamic circulation through complex alterations in vascular tone and splanchnic blood flow.

Extensive Paget disease of bone can increase blood flow through affected bone and, in severe cases, contribute to high-output heart failure.

The clinical task is therefore not simply to identify that cardiac output is high. It is to determine why it is high.

Thiamine deficiency should rise toward the top of the differential when high-output physiology occurs in a patient with significant nutritional risk, unexplained lactic acidosis, neurologic manifestations, alcohol use disorder, prolonged vomiting, malabsorption, or other circumstances compatible with deficiency.

PHARMACOLOGY: Treating the Deficiency Rather Than Chasing Its Consequences

The fundamental treatment of clinically significant thiamine deficiency is thiamine replacement. This is pharmacologically unusual because the substance being administered is a normal nutritional requirement rather than a conventional drug designed to manipulate a physiological pathway.

In severe suspected deficiency, particularly when Wernicke encephalopathy, wet beriberi, or another serious manifestation is present, clinicians generally use parenteral thiamine because oral absorption may be unreliable and treatment should not be delayed while waiting for gastrointestinal absorption or laboratory confirmation.

The exact dose, formulation, and route depend upon the clinical situation and institutional protocols. Severe neurologic disease and severe cardiovascular disease are treated as medical emergencies, and the doses used therapeutically are considerably different from the small daily amounts required for routine nutrition.

Treatment may also require management of the consequences of the deficiency. A patient with pulmonary edema may require careful fluid management and respiratory support. A patient with shock may require intensive hemodynamic management. Electrolyte abnormalities may need correction, and the underlying reason for the deficiency must be identified so that it does not recur.

Thiamine replacement is therefore the etiologic treatment, while the rest of the medical care supports the organs that have already been affected.

PHARMACODYNAMICS: How Thiamine Reverses the Biochemical Bottleneck

Pharmacodynamics asks what a therapeutic substance does to the body.

Thiamine is converted to its active coenzyme forms and incorporated into enzymes that participate in carbohydrate and energy metabolism. By restoring thiamine availability, these enzymes can resume more normal activity.

The effect is not analogous to pushing a button that directly tells the heart to beat harder or the brain to become more alert. It is more like repairing a broken section of an industrial assembly line.

Imagine a factory that has plenty of raw materials and plenty of workers but has lost an essential piece of machinery. The factory cannot process the raw material efficiently, no matter how much additional material is delivered. Replace the missing machine, and production can resume.

Thiamine functions in a similar way. It restores an essential component of several metabolic pathways.

In severe deficiency, this can produce a surprisingly rapid clinical response. Lactate may fall as oxidative metabolism improves, cardiovascular function may stabilize, and neurologic manifestations may begin to improve. The degree and speed of recovery depend heavily upon how severe the deficiency is and how long tissues have been injured.

Some neurological injury can become permanent when treatment is delayed, which is why clinical suspicion and early treatment are so important.

PHARMACOKINETICS: What the Body Does With Thiamine

Pharmacokinetics describes what the body does to a substance after it is administered, including absorption, distribution, metabolism, and elimination.

Thiamine is absorbed through the gastrointestinal tract using specialized transport mechanisms. At high oral doses, passive diffusion also contributes, although absorption is not unlimited. In patients with severe deficiency, gastrointestinal disease, prolonged vomiting, altered anatomy, or an inability to take medication orally, reliance on oral absorption may be inappropriate.

Once thiamine enters the circulation, it is distributed into tissues and taken up by cells. It is converted into active phosphorylated forms, particularly thiamine pyrophosphate, which then participates in enzyme function.

The body does not maintain enormous reserves of thiamine, and excess thiamine is ultimately eliminated primarily through the kidneys. This limited storage capacity helps explain why prolonged inadequate intake can produce deficiency.

Parenteral administration bypasses the gastrointestinal tract and provides a more reliable route of replacement when rapid restoration is clinically important.

The practical implication is that route of administration matters. A severely ill patient with suspected thiamine deficiency is not simply someone who needs to “eat more vitamins.” The immediate problem is restoration of functional thiamine availability to tissues.

The Relationship Between Thiamine and Glucose

The interaction between thiamine and glucose deserves particular attention because it is a classic example of interconnected metabolism.

Glucose metabolism ultimately generates pyruvate, and the conversion of pyruvate into acetyl-CoA requires the thiamine-dependent pyruvate dehydrogenase complex. If thiamine availability is severely limited, this pathway cannot function normally.

Providing carbohydrate therefore increases the amount of substrate entering pathways that require thiamine. In a severely deficient patient, this can increase metabolic stress and worsen manifestations of deficiency.

This is why clinicians often consider thiamine replacement early in patients at high risk of deficiency who require glucose or substantial carbohydrate administration. This should not be misinterpreted as a rule that glucose must be withheld from patients who need it, particularly patients with hypoglycemia. The more accurate principle is that clinicians should recognize the possibility of thiamine deficiency and correct it promptly rather than allowing a metabolic vulnerability to persist.

Medicine is full of these relationships in which one intervention changes the demand placed upon another physiological system.

Why Alcohol Is Such an Important Risk Factor

The association between thiamine deficiency and chronic alcohol use is so strong that the two have become almost inseparable in medical education. But the relationship deserves a more sophisticated explanation than simply saying that people who drink alcohol do not eat properly.

Chronic heavy alcohol exposure can interfere with nutritional intake, gastrointestinal absorption, storage, and utilization of thiamine. Patients may also have vomiting, liver disease, pancreatic disease, or other medical complications that further disrupt nutrition.

The important clinical point is that thiamine deficiency can be present even when a patient’s appearance does not immediately suggest severe malnutrition. Body fat and body weight are not reliable measures of micronutrient sufficiency.

A person can have substantial caloric intake while being deficient in specific vitamins and minerals. Nutrition is not a single variable.

Thiamine Deficiency in the Hospital

Hospitalized patients can be particularly vulnerable because acute illness changes metabolism, nutritional intake, and physiological requirements. Patients may spend days unable to eat normally, undergo repeated procedures, experience vomiting or diarrhea, or depend upon specialized nutritional support.

Patients with preexisting malnutrition may enter the hospital with minimal reserves and then experience an abrupt increase in metabolic demand.

This is one reason clinicians caring for severely ill patients pay attention not only to protein, calories, glucose, sodium, potassium, magnesium, phosphate, and fluid balance, but also to micronutrients.

Critical illness has a way of exposing weaknesses that the body had been compensating for quietly. A patient with marginal thiamine stores may appear stable until infection, trauma, surgery, prolonged fasting, or another major physiological stress increases the demand for energy metabolism.

The resulting deterioration can then be mistakenly attributed entirely to the acute illness.

Sometimes the acute illness is the stressor that reveals the deficiency rather than the complete explanation for the deterioration.

Refeeding and the Metabolic Trap

Severely malnourished patients present another important scenario. When nutritional intake is restarted after prolonged starvation, metabolism shifts from a catabolic state toward an anabolic one. Carbohydrate administration increases insulin secretion and changes the movement of phosphate, potassium, and magnesium into cells. Thiamine requirements also increase because carbohydrate metabolism accelerates.

This is part of the broader phenomenon known as refeeding syndrome.

Thiamine deficiency can therefore coexist with and contribute to the metabolic complications of refeeding. Careful nutritional rehabilitation requires attention to electrolyte abnormalities, fluid balance, and appropriate vitamin replacement rather than simply providing large quantities of calories as quickly as possible.

The lesson is again biochemical: feeding a body is not merely filling an empty tank. The machinery that processes the fuel must also be capable of functioning.

Why Laboratory Testing Does Not Always Settle the Question

Laboratory assessment of thiamine status can be useful, but there are practical limitations. Testing availability varies, results may not return quickly enough to guide emergency treatment, and interpretation can be complicated by the clinical context.

This creates a familiar tension in medicine between diagnostic certainty and therapeutic urgency.

If a patient has a compatible clinical syndrome and a strong risk profile, waiting for a perfect laboratory answer may expose the patient to unnecessary risk. Thiamine is a relatively low-risk intervention when appropriately administered, while untreated severe deficiency can cause irreversible neurological injury or cardiovascular collapse.

The diagnosis is therefore often clinical, supported by laboratory testing when available and by the patient’s response to therapy.

A dramatic improvement after thiamine administration can itself provide powerful retrospective evidence that deficiency was contributing to the illness, although response to therapy should never be used as the sole diagnostic criterion.

What Happens When Thiamine Deficiency Is Missed?

The consequences depend upon the severity, duration, and clinical form of deficiency.

Neurologic injury may become permanent. Wernicke encephalopathy can progress to chronic cognitive impairment. Peripheral neuropathy can produce prolonged weakness, sensory disturbance, and impaired mobility.

Cardiovascular disease can progress to severe edema, heart failure, lactic acidosis, and shock. In fulminant wet beriberi, the patient can deteriorate rapidly.

The tragedy is that the underlying deficiency can be highly treatable when recognized.

This is one reason thiamine deficiency deserves more respect than its place in the nutritional chapter of a medical textbook might suggest. It is not merely a minor vitamin deficiency causing fatigue. Severe deficiency can become a multisystem medical emergency.

The Broader Lesson: Calories Are Not the Same as Nutrition

One of the most important lessons thiamine deficiency teaches is that nutrition cannot be reduced to calories.

Calories provide energy, but the body requires vitamins, minerals, amino acids, fatty acids, electrolytes, and numerous other molecules to convert those nutrients into functioning cells.

A person can consume thousands of calories and still be profoundly deficient in a micronutrient.

The distinction is particularly important in modern medicine because severe nutritional problems do not always resemble the classic images of starvation. Obesity does not guarantee micronutrient sufficiency. A patient can have substantial body fat while simultaneously lacking essential vitamins.

This is why nutritional history should include more than a question about appetite. Physicians need to consider what the patient actually consumes, whether the diet is restricted, whether absorption is impaired, whether nutrients are being lost, and whether metabolic demands have changed.

The Physician’s Perspective: Following the Mechanism Backward

One of the most satisfying aspects of clinical medicine is learning to work backward from physiology.

Suppose a patient presents with heart failure, edema, tachycardia, and elevated lactate. The first instinct might be to look for primary cardiac disease. That is reasonable, but if the cardiac output is unexpectedly high and systemic vascular resistance is low, the question changes.

Why is the circulation hyperdynamic?

Could the patient be profoundly anemic? Is there hyperthyroidism? Is there an arteriovenous shunt? Is advanced liver disease responsible? Could there be severe thiamine deficiency?

Now suppose the same patient also has a history of poor nutritional intake, prolonged vomiting, alcohol use disorder, peripheral neuropathy, confusion, or another feature compatible with thiamine deficiency. Suddenly the biochemical explanation begins to connect the cardiovascular findings.

The diagnosis becomes more than a name. It becomes a physiological story.

That is the level at which medicine becomes most coherent. Instead of memorizing that thiamine deficiency causes wet beriberi, Wernicke encephalopathy, and neuropathy, we understand why those manifestations occur. The vitamin is required for energy metabolism. The brain and heart have enormous energy requirements. The cardiovascular system can become hyperdynamic and vasodilated. The kidneys retain fluid. The nerves cannot maintain normal function. The clinical manifestations follow logically from the biology.

Prevention and Recognition

Preventing thiamine deficiency begins with adequate nutrition, but prevention is particularly important in people whose intake or absorption is compromised. Patients with chronic alcohol use disorder, severe malnutrition, gastrointestinal disease, prolonged vomiting, certain surgical histories, or prolonged specialized nutritional support may warrant particular attention.

In healthcare settings, clinicians must also recognize that risk can change rapidly. A patient who was marginally nourished at baseline may become significantly deficient during a prolonged hospitalization if nutritional intake remains inadequate.

The most useful preventive strategy is therefore not simply taking a vitamin indiscriminately. It is identifying patients whose physiological circumstances make deficiency plausible and ensuring that their nutritional requirements are addressed appropriately.

A Small Molecule With a Very Large Job

Thiamine is a remarkably small part of the human nutritional requirement, yet its influence reaches from individual enzymes to the function of entire organ systems.

At the molecular level, thiamine pyrophosphate helps critical enzymes process metabolic substrates. At the cellular level, those reactions support ATP production and redox balance. At the organ level, the brain and heart depend upon that energy production to function continuously. At the systemic level, thiamine deficiency can alter vascular tone, cardiac output, fluid balance, and tissue perfusion. At the bedside, the result can be neuropathy, encephalopathy, edema, heart failure, lactic acidosis, or shock.

That progression is worth remembering because it illustrates one of the fundamental truths of physiology: small biochemical disturbances can create enormous clinical consequences when they occur at critical points in the body’s metabolic machinery.

Thiamine deficiency is not merely a nutritional footnote, nor is it simply an old-fashioned disease that belongs in a history book beside scurvy and pellagra. It remains a clinically important and potentially devastating disorder, particularly in patients whose nutritional intake, absorption, or metabolic demands have become abnormal.

For physicians, perhaps the most important lesson is diagnostic rather than nutritional. When the patient does not fit the usual explanation, physiology should become the compass. Neurologic dysfunction without an obvious structural lesion, unexplained lactic acidosis, high-output heart failure, profound nutritional risk, or a combination of these findings should prompt consideration of a deficiency that can be remarkably treatable.

The body does not require thiamine in large quantities, but it requires it continuously. Without it, some of the most fundamental machinery of cellular energy production begins to fail. And when that machinery fails, the consequences do not remain microscopic. They become visible in the patient’s gait, cognition, heartbeat, blood pressure, breathing, and ultimately in the ability of the organs to sustain life.

That is the enduring lesson of thiamine deficiency: medicine often begins with the smallest things. A molecule too small to see can determine whether a cell has enough energy to function, whether a heart can meet the demands placed upon it, and whether a brain can maintain consciousness. Understanding that connection is not merely an exercise in biochemistry. It is the difference between recognizing a mysterious deterioration and recognizing a treatable disease.

The Physician-Paramedic, the Late-Night Mutual Aid Call, and the Fall That Wasn’t Quite Over

By 7:30 p.m., we were already at the point in the evening when the station begins to transition from one crew to another. The day crew was finishing up, the overnight crew was settling in, and Kevin, Mike, and I were more or less standing around in that peculiar limbo where you are technically still available but mentally beginning to imagine being home. Nobody had actually left yet, partly because we knew better than to disappear while another crew was still getting situated, and partly because EMS has a way of detecting the precise moment you begin thinking about leaving and immediately punishing you for the thought. We had barely reached that stage when the tones dropped.

“Attention Station 1: Medic 1, Engine 1 and Fly Car: Please respond mutual aid to the next town over for a 63-year-old male complaining of head pain from a fall yesterday.”

There was a brief silence after the dispatch. Not because anyone was particularly alarmed, but because the phrase fall yesterday has a way of making experienced clinicians pause. A fall that happened yesterday but is now producing worsening head pain is not necessarily a minor injury that simply took a little time to become uncomfortable. It can be exactly the opposite. Intracranial hemorrhage, particularly subdural hemorrhage in an older adult, has a notorious ability to evolve quietly. The patient can fall, walk away, sleep, eat dinner, talk to family, and then begin deteriorating as blood accumulates slowly inside the skull. The initial trauma may be almost forgettable while the subsequent physiology becomes increasingly unforgiving.

I grabbed the Fly Car keys and headed outside while Kevin and Mike moved toward Medic 1, with Mike driving this time. Engine 1 rolled out ahead of us, its lights and siren reflecting off the houses as the Q began its familiar mechanical bellow. I followed behind them, heading toward the neighboring town, which was close enough that mutual aid between our departments was essentially part of the normal rhythm of rural EMS. We may have separate department patches on our uniforms, but once the radio sends us across the municipal line, nobody particularly cares whose jurisdiction we are in. A sick patient is a sick patient, and rural EMS works best when everyone understands that geography is considerably less important than physiology.

The drive itself was short, but I found myself thinking about the dispatch information. A 63-year-old man with head pain after a fall the previous day. That was all we had. No mechanism. No anticoagulant history. No loss of consciousness. No vomiting. No neurologic symptoms. No information about whether he had been evaluated yesterday. No information about whether the headache was improving, stable, or worsening. It was one of those dispatches that looked deceptively simple because the radio operator only had a few words to work with.

When we arrived, the patient was inside a modest home, sitting upright in a recliner in the living room. The family had called because his headache had become substantially worse over the preceding several hours. He was awake and speaking with us, and there was no obvious evidence of a major traumatic injury. That was reassuring in the superficial sense, but it did not make me particularly comfortable. In fact, the absence of dramatic external findings was exactly why I wanted to examine him carefully.

Kevin and Mike came in with me, and we immediately began the primary assessment.

Primary Survey

• Airway: Patent; speaking clearly without obstruction.
• Breathing: Spontaneous and unlabored with equal bilateral breath sounds.
• Circulation: Strong peripheral pulses with adequate skin perfusion.
• Disability: Awake and oriented but complaining of progressively worsening headache.
• Exposure: No major external hemorrhage; small ecchymotic area over the posterior scalp.

His vital signs were reasonably stable.

Vital Signs

• HR: 86 beats/min
• BP: 168/92 mmHg
• RR: 18/min
• SpO₂: 97% on room air
• Temperature: 98.4°F
• Blood glucose: 112 mg/dL
• ETCO₂: Not clinically necessary initially because he was awake, breathing normally, and maintaining his airway.

The blood pressure immediately attracted my attention, although I was careful not to interpret it in isolation. Pain can certainly elevate blood pressure, and an isolated reading of 168/92 does not diagnose anything by itself. In a patient with head trauma and headache, however, hypertension becomes part of the larger physiologic picture. We needed to determine whether it was simply a sympathetic response to pain or whether it was accompanied by evidence of altered intracranial physiology.

I began with the history.

He had fallen the previous afternoon while stepping off a small porch. According to his wife, he had lost his footing and fallen backward, striking the back of his head against the wooden edge of a step. There had been no witnessed prolonged loss of consciousness. He had been able to stand with assistance and initially seemed completely normal. He declined medical evaluation at the time because, as his wife put it, “he thought he was fine.”

That sentence is practically a genre in EMS.

He had gone about his normal activities afterward, eaten dinner, watched television, and gone to bed. During the night, however, he developed a headache. By the following afternoon, the pain had intensified considerably. He had also become mildly nauseated and told his wife that he felt “slower” than usual.

That last symptom was vague, but vague neurologic symptoms are still neurologic symptoms.

Secondary Assessment

• HEENT: Small posterior scalp contusion with localized tenderness; no open wound or palpable skull deformity.
• Eyes: Pupils equal, round, and reactive; extraocular movements intact.
• Neck: No obvious midline cervical tenderness or deformity.
• Cardiovascular: Regular rate and rhythm; no obvious dysrhythmia.
• Pulmonary: Clear and equal bilateral breath sounds.
• Abdomen: Soft, nontender, nondistended.
• Pelvis: Stable without pain.
• Extremities: No deformity; intact motor function and distal pulses.
• Back: No significant thoracic or lumbar tenderness.
• Neurologic: GCS 15; oriented to person, place, time, and situation; mild slowing of responses but no obvious aphasia; symmetric facial movement; 5/5 strength in all extremities; sensation grossly intact; no obvious pronator drift; coordination mildly slowed but symmetric.

I was particularly interested in the neurologic examination because it was reassuring without being completely normal. There was no focal motor deficit, no obvious aphasia, no unilateral sensory loss, and no deterioration in consciousness. That substantially reduced the likelihood of certain catastrophic neurologic events, but it did not eliminate intracranial hemorrhage.

A subdural hematoma does not require a patient to arrive unconscious.

That is one of the important misconceptions about head trauma. The brain can tolerate a slowly accumulating collection of blood for a considerable period before the patient’s examination becomes dramatically abnormal. The initial injury may disrupt small bridging veins between the cortical surface and the dural venous sinuses, allowing venous blood to accumulate gradually. As that collection expands, it can compress the underlying brain, distort normal intracranial structures, and eventually impair cerebral perfusion. The patient may therefore progress from headache, nausea, subtle personality or cognitive changes, and mild confusion to focal neurologic deficits, declining consciousness, and ultimately herniation.

That is why the timeline mattered.

The fall was yesterday.

The headache was getting worse today.

That progression was enough to make this a medical problem rather than simply an orthopedic complaint.

We obtained a 12-lead ECG because, in an older patient with a fall, I like to understand whether the event itself could have been precipitated by a cardiovascular problem rather than being purely mechanical. It showed sinus rhythm without an obvious acute ischemic pattern or malignant dysrhythmia. His glucose was normal, eliminating hypoglycemia as an explanation for any altered mentation.

Because the patient was hemodynamically stable and neurologically intact, the Fly Car’s more exotic capabilities remained firmly in their drawers. There was no indication for whole blood, plasma, advanced airway intervention, mechanical CPR, REBOA, or any of the other equipment that makes the vehicle look like an emergency department that somehow escaped its building. We had oxygen, monitoring, IV capability, point-of-care diagnostics, airway equipment, and everything necessary to manage deterioration if it occurred. The important thing was recognizing that the patient did not need everything we carried.

Diagnostics

• Blood glucose: 112 mg/dL, making hypoglycemia unlikely.
• 12-lead ECG: Sinus rhythm without acute ischemic changes or malignant dysrhythmia.
• POCUS cardiac assessment: Grossly preserved cardiac activity without pericardial effusion.
• POCUS pulmonary assessment: Bilateral lung sliding without evidence of pneumothorax.
• Focused traumatic assessment: No obvious thoracic or abdominal injury.
• Neurologic examination: GCS 15 with no clear focal neurologic deficit.

There is an important limitation to point-of-care ultrasound in this particular situation. POCUS can be extremely useful for many trauma and critical-care questions, but it does not replace CT imaging for evaluating suspected intracranial hemorrhage. A normal cardiac or pulmonary ultrasound tells us very little about whether a patient has a subdural hematoma. The absence of a dramatic ultrasound finding therefore did not lower my concern substantially.

The differential diagnosis remained relatively focused.

Differential Diagnosis

1. Delayed intracranial hemorrhage, particularly subdural hematoma: Highest concern because of delayed worsening headache after head trauma with subtle cognitive slowing.
2. Concussion/post-concussive syndrome: Possible, particularly given the initially normal examination, but the progressive nature of the headache warranted imaging.
3. Cervical spine injury: Less likely based on examination and mechanism but not completely excluded.
4. Primary headache disorder: Possible, although the temporal relationship to trauma made this a diagnosis of exclusion.
5. Hypertensive headache: Elevated blood pressure could contribute to symptoms, but it did not adequately explain the preceding trauma and evolving neurologic complaints.
6. Medication-related complication: Particularly important if he were taking anticoagulants or antiplatelet agents.
7. Syncope preceding the fall: Considered because the mechanism was not entirely clear, although the history favored a mechanical fall.

I asked specifically about medications.

He was taking aspirin daily and, according to his wife, had recently started another prescription medication after a cardiac procedure. That immediately prompted us to clarify exactly what he was taking. The family produced his medication list, and he was taking an anticoagulant.

Now the call had changed.

A 63-year-old man with a head strike yesterday, progressive headache today, subtle cognitive slowing, and anticoagulant exposure is not someone I want sitting comfortably in a recliner waiting to see what happens next.

He needed imaging.

There was no indication for empiric reversal medication in the field because we had no confirmed intracranial hemorrhage, no hemodynamic collapse, no rapidly deteriorating neurologic status, and no indication that administering a reversal agent before diagnostic confirmation would improve his outcome. Reversal agents are not benign magic potions. They have indications, risks, costs, and consequences, and they should be used when the clinical circumstances justify them.

Similarly, there was no indication for aggressive blood-pressure reduction. His pressure was elevated, but he was not demonstrating the sort of acute hypertensive emergency in which lowering the pressure precipitously would be appropriate. In a potentially injured brain, maintaining adequate cerebral perfusion is important, and indiscriminate blood-pressure reduction can be counterproductive.

We established IV access, placed him on continuous cardiac and pulse-oximetry monitoring, and prepared him for transport.

Interventions

• IV access established.
• Continuous cardiac monitoring.
• Continuous pulse oximetry.
• Serial neurologic examinations.
• Head and neck maintained in a neutral, comfortable position.
• Fall precautions and assisted movement to stretcher.
• No empiric anticoagulant reversal given without confirmed indication.
• No aggressive blood-pressure reduction because there was no evidence of hypertensive emergency.
• No sedating medication administered because preservation of serial neurologic examination was important.
• Analgesia was deliberately conservative to avoid obscuring neurologic deterioration.

The patient remained stable throughout our assessment.

Reassessment

• HR: 82 beats/min.
• BP: 162/88 mmHg.
• RR: 17/min.
• SpO₂: 98% on room air.
• GCS: 15.
• Neurologic examination: Unchanged without focal deficit.
• Headache: Persistent, approximately 6/10.
• No seizure activity or vomiting.

At that point, my role in the call became less about performing additional interventions and more about deciding whether my continued presence was actually necessary.

This is something I think is important when working as a physician-paramedic. Being the physician does not mean you need to climb into the ambulance every time. In fact, if I automatically transported with every patient simply because I happen to be a physician, I would be doing a disservice to the crew and the system. Kevin and Mike are paramedics. They are experienced clinicians. They have managed countless patients, understand the protocols, know how to recognize deterioration, and do not need me hovering over their shoulders to validate their clinical judgment.

The question is not, “Can I do more?”

There is almost always something more a physician can do.

The better question is, “Does this patient actually need physician-level intervention during transport?”

In this case, the answer was no.

The patient needed a prompt trip to the hospital, serial neurologic reassessments, appropriate monitoring, and diagnostic imaging. Those were well within Kevin and Mike’s capabilities. He was hemodynamically stable, maintaining his airway, breathing normally, and demonstrating a GCS of 15 without focal neurologic deficit or active seizure activity. There was no need for advanced airway management, vasopressor support, blood products, invasive resuscitation, procedural intervention, or physician-directed medication management during the transport.

I therefore stayed through the initial assessment and disposition decision but did not accompany the patient.

Kevin and Mike had this.

And they really did.

They loaded him into Medic 1, continued the appropriate monitoring, and headed toward the receiving emergency department. I remained behind with the Engine crew long enough to make sure there were no additional concerns, then walked back toward the Fly Car.

The decision not to transport with them was not me deciding that the patient wasn’t important. Quite the opposite. The patient was important enough that we had carefully identified what he needed and what he did not need. He needed CT imaging, laboratory evaluation, medication reconciliation, and observation for neurologic deterioration. He did not need a trauma surgeon sitting beside him during a ten-minute ambulance ride simply because one happened to be available.

That distinction matters.

As I climbed back into the Fly Car, I thought about how easy it is to underestimate a fall. Particularly in older adults, the mechanism can sound trivial while the consequences are anything but trivial. A person can trip over a step, strike the back of the head, feel fine, refuse transport, and then begin developing symptoms hours later as an intracranial collection expands. Anticoagulation can further complicate the picture by increasing the risk and severity of bleeding.

The patient had not looked like a trauma patient when we walked through the door.

He looked like a 63-year-old man sitting in a chair with a headache.

The history and examination told a different story.

That is one of the enduring lessons of emergency medicine and EMS: the chief complaint is only the opening sentence. The real diagnosis lives somewhere underneath it, waiting for somebody to ask the next question, examine the patient carefully, and notice when the timeline doesn’t make sense.

I eventually headed back toward our station, leaving Kevin and Mike to complete the transport. I had no doubt they would give the receiving team an excellent handoff, including the anticoagulant history and the progressive nature of the headache, which were arguably more important than the fact that he had simply “fallen yesterday.”

The station was quiet when I returned, the overnight crew now fully settled in. The evening had finally arrived, and for a moment nobody was asking anything of us.

Of course, in EMS, that is usually when the radio starts getting ideas.

Four Seizures in One Day: A Physician-Paramedic at the Warehouse Loading Dock

By 6:22 p.m., the station had developed that peculiar end-of-day feeling that every experienced EMS crew knows well. We had been sitting in the common room watching the local news, the sort of background television that nobody is really watching but nobody bothers turning off either. I was there as a volunteer physician-paramedic with our rural Fire/EMS department, serving in my usual dual capacity as both EMS Medical Director and Commander of EMS, while also running the Fly Car for the shift. Kevin and Mike were assigned to Medic 1. Kevin was our old-school medic from Newark, the sort of clinician who accumulated experience the hard way, call after call, year after year, long before many of the current buzzwords in EMS had been invented. He had retired to our little corner of New England but apparently could not quite retire from medicine, so he continued volunteering with us. Mike, a master plumber by trade who became a paramedic later in life because he wanted to serve the community, had an entirely different background but had developed into one of the strongest practical clinicians on the department. He also possessed a dry, sarcastic sense of humor that could make a morgue feel conversational. Then there was me, the relatively ordinary trauma and critical care surgeon who happened to maintain a paramedic license and somehow thought spending his evenings riding around in a fire department vehicle was a reasonable use of his free time.

The Fly Car was sitting outside, climate-controlled and ready. Describing it as a department vehicle was technically correct but didn’t really capture the absurdity of what had been packed into it. It was essentially a resuscitation bay on four wheels, with custom slide-out trays carrying low-titer O-positive whole blood and liquid plasma, rapid fluid warmers, wireless ultrasound equipment, point-of-care laboratory capability, advanced airway equipment, sophisticated ventilatory support, mechanical CPR, and a medication inventory capable of supporting a remarkable range of critical illness. There were also highly specialized trauma capabilities, including equipment for REBOA, surgical airway intervention, escharotomy, and other procedures reserved for the extraordinarily rare patient whose physiology had crossed into territory where ordinary ambulance medicine was no longer enough. None of that equipment mattered unless we knew when to use it, and perhaps more importantly, when not to use it. A sophisticated resuscitation vehicle is only as useful as the clinical judgment of the people standing beside the patient.

At 6:22 p.m., the tones dropped.

“Attention Station 1: Medic 1, Engine 1 and Fly Car: Please respond to a 25-year-old female, seizure, at the loading dock of warehouse.”

I remember looking at the radio for a moment.

A seizure.

Again.

This was the fourth seizure call of the day.

There are days in EMS when calls seem to arrive according to some strange cosmic sense of humor. You can go months without seeing a particular pathology and then encounter the same complaint repeatedly in a single shift. One seizure call is routine enough. Two makes you start paying attention. Three makes you wonder what the universe is trying to tell you. Four makes you stop thinking of the dispatch category as coincidence and start wondering whether there is something unusual happening in your community, even if the cases ultimately prove unrelated.

The previous three seizure calls had all been significant. None had been the brief, self-limited event followed by a completely lucid patient who could tell us exactly what happened. Each had required meaningful intervention. Each had involved prolonged or recurrent seizure activity and substantial physiologic consequences. Now we were being dispatched to a 25-year-old woman actively seizing at an industrial warehouse.

I grabbed the Fly Car keys and headed outside. Kevin and Mike were already moving toward Medic 1, with Kevin driving. Engine 1 rolled out ahead of them, lights flashing and siren wailing, the Q adding its unmistakable mechanical howl to the evening. I pulled out behind them, heading toward the industrial section of town.

The loading dock was still active when we arrived. Several warehouse employees were standing near the entrance, and one of the supervisors was waving us toward the rear of the building. There was a pallet jack sitting crookedly near the dock and several boxes scattered across the concrete. The patient was on the ground beside the loading platform, actively convulsing.

The scene immediately told us two things.

First, she was genuinely having a generalized convulsive seizure.

Second, she had been there long enough that this was no longer a situation where we could simply wait and see whether it stopped.

The firefighters immediately cleared the area around her. Kevin and Mike moved in, and I joined them. Nobody restrained her. Nobody attempted to put anything in her mouth. Nobody crowded around her. The firefighters created space, brought the stretcher and airway equipment forward, and began obtaining whatever information the witnesses could provide.

She was a young woman, approximately 25 years old, with generalized tonic-clonic activity involving all four extremities. Her jaw was clenched, her eyes were deviated upward, and there was frothy saliva around her mouth. Her clothing suggested she was an employee, and one of her coworkers told us that she had complained of a severe headache earlier in the afternoon but had continued working.

That detail changed my level of concern almost immediately.

A seizure in a 25-year-old has a broad differential. A first seizure can be epilepsy, but epilepsy is a diagnosis of exclusion in the context of an acute presentation. We needed to consider hypoglycemia, electrolyte abnormalities, toxicologic exposure, medication withdrawal, pregnancy-related pathology, infection, traumatic injury, structural intracranial disease, venous sinus thrombosis, hemorrhage, stroke, and a host of other less common possibilities. The preceding severe headache was particularly important because it raised the possibility of an intracranial process.

We began with the primary survey while the seizure continued.

Primary Survey

• Airway: Threatened by active convulsions, jaw clenching, and copious secretions.
• Breathing: Ineffective respiratory pattern during portions of the seizure with intermittent hypoxemia.
• Circulation: Strong central pulse with marked tachycardia.
• Disability: Ongoing generalized tonic-clonic activity with no meaningful neurologic examination possible.
• Exposure: No major external hemorrhage; small scalp abrasion noted over the right temporal region.

Her initial vital signs reflected the physiologic stress of prolonged convulsive activity.

Vital Signs

• HR: 156 beats/min
• BP: 172/98 mmHg
• RR: Irregular, approximately 8–12/min between convulsive movements
• SpO₂: 82% on room air
• Temperature: 101.3°F
• Blood glucose: 97 mg/dL
• ETCO₂: Approximately 54 mmHg when a reliable waveform could be obtained

The oxygen saturation immediately caught everyone’s attention, although I was more concerned about the overall respiratory pattern than the absolute number. During a prolonged generalized seizure, ventilation can become profoundly ineffective because the patient is simultaneously consuming enormous amounts of oxygen and generating large quantities of carbon dioxide while the normal mechanics of ventilation are disrupted by sustained skeletal muscle contraction.

The brain was having an electrical storm, but the rest of the body was paying the metabolic bill.

We administered supplemental oxygen and positioned her to optimize airway patency while suction remained immediately available. Kevin obtained vascular access while Mike worked on monitoring and airway support. I concentrated on seizure termination and simultaneously began reconstructing the events leading up to the call.

The first medication was midazolam 10 mg IM, selected because we needed rapid anticonvulsant treatment and did not want IV access to delay therapy. The patient was not exactly in a cooperative mood, and asking her to hold still for a carefully placed IV while experiencing generalized convulsions would have been an exercise in optimism.

The medication began taking effect, but the seizure continued.

This was the point at which the distinction between a seizure and status epilepticus became clinically important. The brain does not benefit from prolonged generalized electrical activity, and the longer a seizure continues, the more difficult it can become to terminate. Prolonged seizure activity also increases catecholamine release, metabolic demand, temperature, acidosis, carbon dioxide production, and the risk of hypoxemia and aspiration. Our objective was not simply to make the movements stop. It was to terminate the pathophysiologic process while preserving oxygenation, ventilation, and cerebral perfusion.

IV access was established, and lorazepam 4 mg IV was administered. When the seizure persisted, another 4 mg IV was given according to our status epilepticus protocol.

The convulsions finally began to diminish.

Her arms stopped their rhythmic extension. Her legs became still. The jaw relaxed enough for us to suction her airway effectively.

But she did not wake up.

That was not surprising after a prolonged seizure and benzodiazepine administration, but it also meant we could not simply declare the emergency over. Persistent depressed consciousness after seizure activity may represent a normal postictal state, medication effect, ongoing nonconvulsive status epilepticus, hypoxic injury, intracranial pathology, toxicologic disease, or some combination of those processes.

The next phase was therefore just as important as the first.

Secondary Assessment

• HEENT: Pupils equal and reactive; small tongue laceration; no facial deformity; superficial right temporal scalp abrasion.
• Neck: No obvious cervical deformity or significant midline tenderness.
• Cardiovascular: Sinus tachycardia; peripheral pulses present.
• Pulmonary: Initially diminished respiratory effort following seizure termination; bilateral breath sounds present.
• Abdomen: Soft and nondistended.
• Pelvis: Stable without obvious tenderness.
• Extremities: No obvious deformity; no unilateral weakness once spontaneous movement returned.
• Back: No obvious major traumatic injury.
• Neurologic: Initially deeply postictal, withdrawing from painful stimulation symmetrically; progressively increasing spontaneous movement without obvious lateralizing deficit.

The coworker who had witnessed the beginning of the event gave us the history we needed.

The patient had complained of a severe headache approximately 30 minutes before the seizure. She had described it as unusually intense and had apparently told another employee that she had never experienced a headache like it before. She then became nauseated, appeared confused, and collapsed.

That history changed the differential considerably.

A 25-year-old woman with a new seizure preceded by a sudden severe headache raises concern for intracranial hemorrhage, cerebral venous pathology, arterial pathology, or another acute neurologic process. Pregnancy-related disease also needed to be considered, including eclampsia, depending on her pregnancy status. Toxicologic causes remained possible, particularly because we were at an industrial workplace, although there was no obvious exposure history.

We checked her glucose again.

97 mg/dL.

Hypoglycemia was not responsible.

We obtained a 12-lead ECG. It demonstrated sinus tachycardia without a malignant dysrhythmia, significant conduction abnormality, or convincing ischemic pattern. Her blood pressure remained elevated, which could have been a physiologic response to the seizure, but given the preceding headache we did not dismiss it.

Point-of-care laboratory testing gave us additional information.

Diagnostics

• Blood glucose: 97 mg/dL.
• Sodium: 139 mEq/L.
• Potassium: 3.7 mEq/L.
• Calcium: Within the available reference range.
• Lactate: 7.1 mmol/L.
• Venous blood gas: Mixed metabolic and respiratory acidosis immediately following prolonged convulsive activity.
• 12-lead ECG: Sinus tachycardia without malignant dysrhythmia.
• POCUS cardiac examination: Grossly preserved left ventricular systolic function without pericardial effusion.
• Lung ultrasound: No obvious pneumothorax or large pulmonary edema pattern.
• Focused trauma assessment: No evidence of major thoracoabdominal trauma.

The lactate was markedly elevated, but once again, context mattered. A prolonged generalized seizure can generate a substantial lactic acid burden through intense skeletal-muscle activity and altered systemic metabolism. The lactate therefore supported the fact that this had been a significant physiologic event but did not tell us why she had seized.

The question was the cause.

And we did not know.

That was enough for me.

Differential Diagnosis

1. Acute intracranial pathology, including subarachnoid hemorrhage: High concern because of the reported sudden severe headache preceding a first seizure.
2. New-onset epilepsy: Possible, although the preceding headache and circumstances demanded investigation for an acute secondary cause.
3. Cerebral venous sinus thrombosis: Important consideration in a young woman with headache and seizure, particularly if additional risk factors were subsequently identified.
4. Pregnancy-related seizure/eclampsia: Required exclusion based on pregnancy status, even in the absence of an established pregnancy history.
5. Toxicologic exposure: Possible given the industrial environment and incomplete history.
6. Metabolic or electrolyte disturbance: Less likely given normal glucose, sodium, potassium, and calcium on available testing.
7. CNS infection: Considered but less supported in the absence of fever, meningismus, or preceding infectious symptoms.
8. Traumatic seizure: Possible because of the fall, but witnesses indicated that the seizure began before the collapse.
9. Cardiac dysrhythmia with secondary convulsive activity: Considered but less likely given the witnessed prolonged generalized convulsions and sinus rhythm on ECG.

The more I learned, the less comfortable I became with the idea that this was simply an uncomplicated seizure disorder.

The patient had required multiple anticonvulsant interventions. She had experienced hypoxemia and hypoventilation during the event. She had a markedly elevated lactate consistent with prolonged convulsive activity. She had a new neurologic presentation. Most importantly, she had a history of an unusually severe headache immediately before losing consciousness.

This was not a “load and go because she had a seizure” call.

This was a neurologic emergency with an unidentified cause.

Interventions

We continued aggressive airway support, suction, oxygenation, continuous cardiac monitoring, pulse oximetry, and capnography. Her respiratory effort improved after the seizure stopped, but we remained prepared for assisted ventilation because the combination of prolonged seizure activity and benzodiazepines can produce significant respiratory depression.

A second-line antiseizure medication was prepared in accordance with our protocol because of the prolonged seizure duration and recurrence after initial benzodiazepine therapy. Fortunately, the convulsive activity remained controlled before additional escalation became necessary.

We maintained IV access and obtained serial vital signs. Because there was no evidence of hypoglycemia, no dextrose was administered. Because there was no convincing evidence of sepsis or meningitis in the prehospital environment, antibiotics were not administered. We also avoided unnecessary sedating medications that could further obscure the neurologic examination.

Medications

• Midazolam 10 mg IM for rapid termination of ongoing generalized convulsive activity.
• Lorazepam 4 mg IV, followed by an additional 4 mg IV for persistent seizure activity according to protocol.
• Second-line antiseizure therapy prepared because of the prolonged course and risk of recurrence.
• No dextrose, because glucose was normal.
• No empiric antibiotics, because the available history and examination did not support immediate prehospital treatment for CNS infection.
• No opioid analgesia, because the patient was unable to provide a reliable pain history and additional respiratory depression would have complicated neurologic assessment.

The patient’s physiology gradually improved.

Reassessment

• HR: Improved from 156 to approximately 112 beats/min.
• BP: 154/88 mmHg.
• RR: 18/min with improving spontaneous ventilation.
• SpO₂: 96% with supplemental oxygen.
• ETCO₂: 39–42 mmHg with a reliable waveform.
• Temperature: 100.9°F.
• Neurologic status: Deeply postictal but increasingly responsive to voice and painful stimulation.
• Seizure activity: No further generalized convulsions.
• Airway: Maintained independently with suction available.
• Cardiac rhythm: Sinus tachycardia without malignant ectopy.

I had already made the decision that I was going with her.

There really wasn’t much debate.

This was our fourth seizure call of the day, but that wasn’t the reason. The reason was the patient herself. A prolonged first-known seizure in a young adult, requiring multiple interventions, with respiratory compromise and a preceding severe headache, represents a substantially different level of clinical uncertainty from an uncomplicated seizure in a known epileptic patient who returns rapidly to baseline.

There was a lot happening simultaneously, and there were several things that could go wrong during transport.

She could seize again.

She could develop worsening respiratory depression from the medication required to control the seizure.

She could deteriorate neurologically.

She could have an intracranial hemorrhage.

She could have an occult toxicologic problem.

She could become hypotensive.

She could aspirate.

She could simply fail to wake up in a manner consistent with a normal postictal state.

Kevin and Mike were completely capable of managing any of those immediate problems within their paramedic scope, but this was precisely the type of patient for whom having physician-level clinical assessment available throughout transport added meaningful value. My presence wasn’t a reflection of their ability. It was a reflection of the patient’s complexity.

A firefighter from Engine 1 took the Fly Car back to the station while I climbed into Medic 1.

Kevin and Mike continued the transport preparation without any unnecessary fuss. This is another reason I like working with experienced people. Nobody needed a lecture about roles. Nobody needed to announce who was in charge. Kevin continued managing the patient, Mike managed the ambulance environment, and I stayed at the head of the stretcher, watching the neurologic and respiratory trajectory.

During transport, the patient’s eyes eventually opened.

She was confused, frightened, and exhausted. She could follow simple commands but initially could not remember where she was. She repeatedly asked what had happened. Her speech was coherent, but she remained disoriented to the events immediately preceding the seizure.

That was encouraging.

It was also not enough.

A patient can improve after a seizure and still have a very serious underlying cause.

We continued serial neurologic examinations. There was no obvious facial asymmetry, no unilateral weakness, and no aphasia. Her pupils remained equal and reactive. Her respiratory pattern stayed stable, and her oxygen saturation remained in the mid-to-high 90s. There was no recurrence of convulsive activity.

By the time we reached the emergency department, she was awake enough to answer simple questions, although she remained understandably confused about the events surrounding the seizure.

The handoff was deliberately detailed.

We told the emergency department team exactly how long the convulsive activity had lasted as best as could be reconstructed, the medication sequence, the periods of hypoxemia and hypoventilation, her glucose, ECG findings, lactate, neurologic trajectory, the scalp injury, and, most importantly, the report of a sudden severe headache immediately before the seizure.

That last piece of information was not buried somewhere at the bottom of the handoff.

It was central.

The emergency department would need to determine whether she required emergent neuroimaging and further neurologic investigation, including consideration of CT imaging, vascular imaging, lumbar puncture where appropriate, MRI, EEG, toxicology studies, pregnancy testing, and a broader metabolic evaluation depending on the evolving clinical picture.

We transferred her care and stepped back.

As I walked out of the emergency department, I found myself thinking about the strange nature of EMS. We had started the afternoon sitting in a common room watching local news, probably expecting another routine shift. Instead, the day had produced four seizure calls, each of which had forced us to confront a different clinical problem.

And the fourth one was the one that stayed with me.

Not because it was dramatic.

Because it was uncertain.

The most dangerous patients are not always the ones who look the sickest. Sometimes they are the patients who give you just enough information to know that something is wrong without giving you enough information to know exactly what it is. The young woman at the warehouse was one of those patients. The seizure itself was obvious. The reason for the seizure was not.

That distinction is fundamental to medicine.

A seizure is a manifestation, not an explanation.

The work is figuring out what caused it.

As I drove back toward the station in the evening, the town was settling down. The industrial roads were quieter, the traffic lighter, and the last traces of daylight were beginning to disappear. Somewhere behind me, Medic 1 was continuing its shift, and somewhere ahead of me was the station with its open bays, aging coffee, familiar chairs, and the inevitable knowledge that the radio could interrupt all of it again at any moment.

Four seizure calls in one day is enough.

I sincerely hoped the radio agreed with me.

Three Seizures, One Afternoon: A Physician-Paramedic’s Third Call

By 5:12 p.m., the day had acquired a peculiar rhythm that experienced EMS crews learn to recognize but never quite become comfortable with. The station had been relatively quiet between calls, and Kevin, Mike, and I were sitting in the common room watching the local news, drinking coffee and enjoying that small window of time when nobody was asking us to go anywhere in a hurry. I was working my volunteer shift as a physician-paramedic with our rural Fire/EMS department, serving, as I do, in the dual administrative roles of EMS Medical Director and Commander of EMS, while also riding the Fly Car when the clinical situation warrants it. Kevin was the old-school medic from Newark who had retired to our quieter corner of New England but apparently had never received the memo that retirement was supposed to involve sitting around doing nothing. Mike, a master plumber by profession and paramedic because he decided later in life that he wanted to serve his town, was sitting nearby with the expression of a man who had already made several sarcastic observations about the television and was merely waiting for the appropriate moment to make another. Between the two of them there is an extraordinary amount of practical experience, and one of the reasons I enjoy working with them is that neither needs me hovering over his shoulder. They know how to practice medicine. They know their protocols. They know their limitations. My job is to add another layer of clinical capability when the patient’s physiology requires it, not to turn every EMS call into a mobile academic conference.

The Fly Car itself was parked outside, waiting for the next problem. It was, in the most charitable possible description, a slightly ridiculous amount of medical capability packed into one vehicle. It was a climate-controlled resuscitation bay on four wheels, with custom slide-out trays containing low-titer O-positive whole blood and liquid plasma, rapid warming equipment, wireless dual-probe ultrasound connected to rugged tablets, point-of-care laboratory equipment, advanced airway equipment, a turbine-driven transport ventilator, mechanical CPR capability, and a medication inventory capable of supporting resuscitation well beyond what one normally expects from a rural ambulance. The more specialized trauma equipment was there for the very small number of patients whose injuries or physiology justify extraordinary intervention, including REBOA capability, surgical airway equipment, escharotomy supplies, and other tools that I sincerely hope spend most of their existence untouched. The impressive part of such a vehicle, however, isn’t the equipment. It is having clinicians who understand that sophisticated equipment is useful only when the clinical problem actually calls for it. A million-dollar resuscitation bay does not make every patient a million-dollar resuscitation.

At 5:12 p.m., the tones interrupted the television.

“Attention Station 1: Medic 1, Engine 1 and Fly Car: 20-year-old male, seizure in the parking lot of restaurant.”

I remember looking at the clock and thinking that we had already done this twice.

This was our third seizure call of the day.

That alone would not have determined how I responded, because every seizure is its own clinical problem, but the first two had not been trivial events. Both had involved prolonged or recurrent seizure activity and required substantial intervention. Now we were being sent to a third young person actively seizing. Statistically, coincidence happens, but clinically, patterns deserve attention. A 20-year-old with a seizure in a restaurant parking lot could have epilepsy, a first seizure, intoxication, withdrawal, hypoglycemia, electrolyte disturbance, meningitis or encephalitis, toxic ingestion, traumatic brain injury, structural intracranial disease, or a seizure provoked by something much more mundane. The dispatcher’s description gave us almost nothing, which meant we had to be prepared to discover everything.

I grabbed the Fly Car keys and headed outside while Mike and Kevin moved toward Medic 1, Mike taking the driver’s seat. Engine 1 rolled out behind them, lights flashing, siren and Q roaring down the road. I pulled out immediately, and within seconds the familiar combination of emergency lighting, radios, and traffic parting ahead of us had replaced the quiet of the station.

As we approached the restaurant, dispatch updated us that the patient was still having seizure activity.

That changed the character of the call.

A seizure that has already stopped is one problem. A patient who is actively convulsing when EMS arrives is another. The immediate question is not what caused the seizure. The immediate question is whether the patient is ventilating, whether oxygenation is adequate, whether there is circulation, whether glucose is normal, whether there is an immediately reversible cause, and whether the seizure is continuing long enough to threaten the brain and the rest of the body.

Engine 1 arrived first, and the firefighters were already moving toward the patient when I pulled in. The patient was on the asphalt near the entrance to the restaurant, surrounded by several understandably frightened bystanders. He was in generalized tonic-clonic activity, with rhythmic bilateral limb movements and forced jaw activity. There was saliva around his mouth, and one firefighter had already moved nearby objects away from him to prevent additional trauma.

There was no attempt to restrain him, and nobody was trying to force anything into his mouth, which is worth mentioning because those two mistakes have somehow survived generations of medical education despite being spectacularly unhelpful.

Kevin and Mike arrived almost immediately, and we moved into a coordinated primary assessment.

The first thing I noticed was that the seizure had clearly been going on long enough that we could no longer treat it as an event that would simply resolve if we waited patiently. His airway was not reliably protected, his respiratory pattern was ineffective between convulsive movements, and his oxygen saturation was falling despite supplemental oxygen. The distinction between a generalized seizure and status epilepticus is not merely academic. Prolonged seizure activity creates a vicious physiologic cycle in which increased metabolic demand collides with impaired ventilation and oxygenation, producing hypoxemia, hypercapnia, acidosis, hyperthermia, catecholamine excess, and ultimately cellular injury. The longer the seizure continues, the more difficult it can become to terminate pharmacologically, which is why early treatment matters.

Primary Survey

• Airway: Threatened by ongoing generalized convulsive activity and excessive oral secretions.
• Breathing: Irregular and inadequate during the seizure; oxygenation initially impaired.
• Circulation: Strong central pulse with tachycardia; no evidence of cardiac arrest.
• Disability: Generalized tonic-clonic seizure activity; unable to assess meaningful neurologic function during active convulsions.
• Exposure: No obvious major external trauma, although the patient had abrasions over the posterior scalp and right elbow consistent with a fall.

The initial vital signs were concerning but not unexpected for a prolonged generalized seizure.

Vital Signs

• HR: 148 beats/min
• BP: 168/94 mmHg
• RR: Irregular, approximately 10–12/min between convulsive episodes
• SpO₂: 86% on room air, improving only partially with supplemental oxygen
• Temperature: 100.8°F
• Blood glucose: 104 mg/dL
• ETCO₂: 51 mmHg when a reliable waveform could intermittently be obtained

The glucose immediately removed one of the easiest reversible causes from the list. A blood glucose of 104 mg/dL did not explain what we were seeing, and there was no indication for dextrose.

We immediately moved into seizure termination.

The specific medication sequence was determined by our EMS protocol and the patient’s clinical response, but the principle was straightforward: ongoing generalized convulsive status requires rapid administration of an effective benzodiazepine rather than waiting for the seizure to stop spontaneously. Kevin established vascular access while Mike managed airway positioning and suction. I focused on the overall resuscitation and neurologic assessment while simultaneously trying to determine whether this was a primary seizure disorder or a provoked seizure.

We administered midazolam 10 mg IM because obtaining reliable IV access during active generalized convulsions was initially difficult. The medication was chosen because it provides rapid anticonvulsant activity and can be administered without waiting for a perfectly cooperative patient to hold still, which, unsurprisingly, is a difficult request during a generalized seizure.

We continued aggressive airway support with suction, positioning, and high-flow oxygen. We did not attempt to intubate simply because the patient was seizing. Intubation is a means of controlling oxygenation and ventilation when those functions cannot otherwise be maintained, not a reflexive response to the presence of convulsions. At that moment, our priority was to terminate the seizure and restore effective spontaneous ventilation.

The first dose began to take effect, but the seizure did not stop completely.

That was the moment the entire team became even more focused.

The convulsive activity decreased in amplitude, then returned. There was a brief period of reduced movement followed by another generalized episode. This was no longer the sort of seizure that invited patience. We needed definitive control.

An IV was established, and we administered lorazepam 4 mg IV, followed by a repeat dose in accordance with our status epilepticus protocol when seizure activity persisted. The exact choice of benzodiazepine can vary by system, but the underlying principle remains the same: terminate the electrical storm as quickly as possible while simultaneously supporting airway and ventilation.

Within several minutes, the convulsive activity finally stopped.

The patient did not immediately wake up.

That was expected to some degree, but it created another important diagnostic problem. A postictal patient can be profoundly altered, but a persistently unresponsive patient after a prolonged seizure can also have ongoing nonconvulsive status epilepticus, intracranial hemorrhage, toxicologic pathology, hypoxic injury, or another underlying neurologic catastrophe. We therefore could not simply declare victory because the arms and legs had stopped moving.

Secondary Assessment

• HEENT: Pupils approximately 4 mm and reactive bilaterally; tongue trauma with small amount of blood in the mouth; no obvious facial deformity.
• Neck: No obvious cervical deformity; no significant midline tenderness identified during initial assessment.
• Cardiovascular: Tachycardic but regular; peripheral pulses palpable.
• Pulmonary: Initially diminished respiratory effort following benzodiazepine administration, improving with stimulation and assisted ventilation.
• Abdomen: Soft and nondistended without obvious tenderness.
• Pelvis: Stable.
• Extremities: No obvious deformity; superficial abrasion to right elbow.
• Back: No obvious major traumatic injury.
• Neurologic: Initially deeply postictal, withdrawing symmetrically to painful stimulation; no obvious unilateral motor deficit once spontaneous movement returned.

There was something about the patient that bothered me.

The seizure itself was serious, but the circumstances surrounding it did not feel completely explained.

The restaurant employees told us that he had been acting strangely before the seizure. One person described him as “very sweaty and confused.” Another said he had been pacing around the parking lot and repeatedly rubbing his chest. A friend who had been with him said he had complained earlier of feeling “weird” and nauseated. Nobody could provide a reliable medication history.

That was enough to widen the differential considerably.

A 20-year-old with a generalized seizure certainly could have epilepsy, but there was no known seizure history. A first seizure in a young adult deserves an explanation. The absence of known epilepsy made provoked seizure particularly important, and the combination of agitation, diaphoresis, tachycardia, seizure activity, and an incomplete history raised the possibility of toxicologic exposure.

Diagnostics

We obtained repeat point-of-care glucose, ECG, and laboratory testing while continuing neurologic and respiratory monitoring.

• Blood glucose: 104 mg/dL.
• Sodium: 138 mEq/L.
• Potassium: 3.8 mEq/L.
• Calcium: Within the available point-of-care reference range.
• Lactate: 6.2 mmol/L, consistent with substantial metabolic stress from prolonged generalized convulsive activity.
• Venous blood gas: Mild respiratory and metabolic acidosis, improving with restoration of adequate ventilation.
• 12-lead ECG: Sinus tachycardia without STEMI pattern or malignant dysrhythmia.
• POCUS cardiac assessment: Grossly preserved left ventricular systolic function without pericardial effusion.
• Lung ultrasound: No obvious large pneumothorax or diffuse pulmonary edema.
• Focused trauma ultrasound: No obvious free intraperitoneal fluid.

The lactate was elevated enough to look frightening if viewed without context, but this is where clinical reasoning matters. Generalized convulsive seizures can produce significant lactic acidosis because skeletal muscles are consuming enormous amounts of ATP under conditions of intense metabolic demand, while tissue perfusion and ventilation may simultaneously become less efficient. A lactate of 6.2 mmol/L immediately after prolonged convulsions is therefore not, by itself, proof of sepsis, shock, or mesenteric ischemia. What mattered was whether the lactate subsequently cleared as the seizure stopped and perfusion and ventilation normalized.

The more concerning finding was the history.

When the patient’s friend finally produced his backpack, we found several medication containers and an unlabeled plastic bag. We did not need to conduct a forensic investigation in the parking lot, but the contents increased our concern for an ingestion. There was no reliable way to determine exactly what had been taken, and the patient was still unable to provide a history.

That uncertainty was itself a reason to transport him at a higher level of concern.

Differential Diagnosis

1. Provoked generalized seizure due to toxicologic exposure: High on the list because of the behavioral changes, autonomic findings, unclear ingestion history, and lack of known epilepsy.
2. New-onset epilepsy: Possible, particularly given the generalized convulsive pattern, but the surrounding history suggested looking for an acute provoking factor.
3. Metabolic seizure: Glucose was normal, sodium was normal, and no immediately obvious electrolyte catastrophe was identified.
4. Intracranial structural pathology: Must be considered in a first seizure, particularly with head trauma, although there was no obvious focal neurologic deficit.
5. CNS infection: Less likely without fever, meningismus, or preceding infectious symptoms, but not eliminated.
6. Traumatic seizure: Possible if the fall preceded the seizure rather than resulted from it, although witnesses suggested the seizure began before the patient struck the ground.
7. Cardiac dysrhythmia with secondary convulsive activity: Considered, but the rhythm remained sinus tachycardia and the clinical event was strongly consistent with generalized seizure.
8. Psychogenic nonepileptic seizure: Low on the differential given the physiologic abnormalities, hypoxemia, postictal state, and response to anticonvulsant treatment.

Interventions

The treatment priorities remained seizure termination, airway protection, oxygenation, ventilation, circulation, temperature monitoring, glucose assessment, cardiac monitoring, and rapid transport to definitive care. We maintained continuous pulse oximetry and ETCO₂ monitoring, kept suction immediately available, and continued assisted ventilation as needed while the benzodiazepines took effect. IV access was maintained, and we prepared for escalation to advanced airway management if the patient failed to maintain adequate ventilation or developed recurrent refractory seizure activity.

Because the seizure had been prolonged and required multiple medication interventions, we also prepared a second-line antiseizure medication in accordance with our system’s status epilepticus protocol. The patient fortunately did not require escalation to intubation because his spontaneous respiratory effort improved and his oxygenation stabilized with supportive airway management.

Medications

• Midazolam 10 mg IM for immediate termination of ongoing generalized convulsive activity when IV access was initially difficult.
• Lorazepam 4 mg IV, followed by an additional 4 mg IV for persistent seizure activity according to protocol.
• Second-line antiseizure therapy was prepared because of the prolonged and recurrent nature of the seizure, although clinical seizure cessation occurred before it became necessary.
• No dextrose was administered because blood glucose was normal.
• No empiric antibiotics were given because there was no convincing prehospital evidence of CNS infection.
• No thrombolytic therapy was indicated because there was no evidence of acute ischemic stroke.
• No opioid analgesia was administered because it would have added respiratory-depressant effects without addressing the immediate problem.

Once the seizure had stopped, the physiology began to normalize, but his mental status remained significantly depressed. His respiratory rate was improving, his oxygen saturation climbed into the mid-to-high 90s, and his heart rate gradually declined. The lactate was expected to remain elevated immediately following the convulsive event, and its eventual clearance would be something the hospital could follow serially.

Reassessment

• HR: Improved from 148 to approximately 108 beats/min.
• BP: 142/82 mmHg.
• RR: 18/min with improving spontaneous respiratory effort.
• SpO₂: 96–98% with supplemental oxygen.
• ETCO₂: 38–42 mmHg with a more reliable waveform.
• Temperature: 100.6°F.
• Neurologic status: Deeply postictal but increasingly responsive to verbal and painful stimulation, with spontaneous movement of all four extremities.
• Seizure activity: No further generalized convulsions after medication therapy.
• Airway: Maintaining independently with suction available.
• Cardiac rhythm: Sinus tachycardia without malignant ectopy.

At that point, I made the decision that I would accompany the patient to the hospital.

This was not because Kevin and Mike were incapable of managing him. Quite the opposite. Both are extraordinarily capable paramedics, and either one could manage a postictal patient through a conventional transport without difficulty. The decision was about the complexity and uncertainty of the case, not about competence.

This was a 20-year-old with a first known seizure, prolonged convulsive activity, recurrent seizure despite an initial benzodiazepine, altered mental status, possible toxicologic exposure, transient hypoxemia and hypoventilation, metabolic acidosis, head trauma from the fall, and an incomplete history. There was enough uncertainty that I wanted physician-level assessment available throughout transport, particularly because recurrent status epilepticus could require escalation of anticonvulsant therapy and airway management.

This was exactly the sort of call for which the Fly Car existed.

A firefighter from Engine 1 took the Fly Car back to the station for me while I climbed into Medic 1 with Kevin and Mike. There was no need to leave an additional vehicle sitting at the hospital, and the firefighter could return the vehicle to the station so that our system remained operational.

The patient was transferred onto the stretcher and secured. Kevin continued neurologic reassessments while Mike managed the airway equipment and transport environment. I remained at the head of the stretcher, watching the patient’s respiratory pattern and mental status rather than simply staring at the monitor.

One of the peculiar things about status epilepticus is that the seizure can end while the emergency continues.

The electrical storm may stop, but the consequences remain. Benzodiazepines can suppress respiratory drive. Prolonged convulsions generate acidosis and hyperthermia. Hypoxemia can compound neurologic injury. Aspiration is a real risk. And the original cause may still be sitting quietly inside the patient, waiting to reveal itself.

Our patient gradually became more responsive during transport. He opened his eyes when spoken to and eventually followed a simple command. He still could not provide a coherent history, but the trajectory was encouraging. There was no recurrent seizure activity, no hypotension, and no respiratory deterioration.

Transport Decision and Clinical Destination

The patient required transport to an emergency department capable of advanced neurologic and toxicologic evaluation. His first seizure, prolonged seizure duration, medication requirement, altered mental status, possible ingestion, and head injury made a higher-acuity emergency department appropriate. Physician-paramedic presence was justified because of the prolonged seizure course and possibility of recurrent status epilepticus or respiratory deterioration, although no invasive airway procedure became necessary during transport.

The hospital would need to determine the underlying cause through a much broader diagnostic evaluation, potentially including comprehensive metabolic testing, toxicology studies, serum medication levels where appropriate, neuroimaging, and ultimately neurologic evaluation and EEG if his mental status failed to normalize.

The ambulance ride itself was uneventful, which in EMS is often the best possible outcome.

When we arrived, the emergency department team was waiting. We gave a structured handoff describing the seizure duration, medication sequence, respiratory compromise, laboratory findings, possible toxicologic exposure, trauma findings, ECG, glucose, and his neurologic trajectory. We emphasized that the patient had not simply experienced a brief seizure and awakened normally. He had experienced prolonged generalized convulsive activity requiring multiple anticonvulsant interventions and had remained significantly altered afterward.

That distinction mattered.

The patient disappeared behind the emergency department doors, and for the first time since the tones dropped, I felt the tension in my shoulders ease a little.

Three seizure calls in one day is more than enough for any rural EMS crew.

As I headed back toward the station, I found myself thinking about how easily a seizure can become reduced to a single word in a dispatch system. “Seizure” sounds like a diagnosis, but it isn’t. It is a clinical manifestation. The real work begins after the word appears on the dispatch screen. Was it provoked or unprovoked? Was there hypoglycemia, hyponatremia, hypoxia, toxic exposure, infection, trauma, structural disease, withdrawal, or epilepsy? Was the patient actually having ongoing electrical seizure activity after the convulsions stopped? Was the respiratory failure caused by the seizure, the medication, aspiration, or the underlying disease?

Those questions are where prehospital medicine becomes more than simply following a protocol.

Protocols give us a framework, and they are invaluable. But good clinicians still have to recognize the patient inside the algorithm.

By the time I returned to the station, the television was still on in the common room, although nobody seemed particularly interested in whatever local story was being discussed. The station had returned to its normal quiet, and somewhere inside Medic 1, the coffee that Kevin had abandoned earlier was probably still sitting exactly where he left it.

I walked back through the bay and looked at the Fly Car.

It was once again just a vehicle.

For a few hours, however, it had been an extension of an emergency department, carrying the equipment and clinical capability necessary for a young man whose brain had decided, for reasons we did not yet understand, to generate an electrical storm.

And that is really the point of being a physician-paramedic in a rural EMS system. It isn’t about showing up with more equipment than everyone else, and it certainly isn’t about proving that the physician has the final word. It is about recognizing when the ordinary tools and ordinary level of care are enough, and recognizing when the physiology in front of you has crossed a threshold where another level of expertise is useful.

This patient had crossed that threshold.

Kevin and Mike knew it.

I knew it.

And together, without much discussion and without anybody needing to establish who was in charge, we did what good EMS crews are supposed to do: we identified the immediate threats, treated what could be treated, investigated what could be investigated, anticipated what could happen next, and got the patient to the people who could continue the work.

Then we went back to the station and waited for the tones to drop again.

When “Vomiting” Isn’t Just Vomiting: Another Afternoon as a Physician-Paramedic

By late afternoon, the station had settled into that familiar August lull that makes you wonder whether the rest of the world has forgotten about emergency medicine for a few hours. The common room television was on, local news murmuring in the background while Kevin, Mike, and I occupied ourselves with the usual mixture of coffee, conversation, and pretending that we were not watching the clock. I was off from my usual work as a trauma and critical care surgeon, which meant that instead of spending the afternoon worrying about ventilators, hemorrhage, postoperative complications, and whether somebody’s lactate was going in the correct direction, I was volunteering with our rural Fire/EMS department as a physician-paramedic. I serve as both Medical Director and Commander of EMS, but when I am on duty in the Fly Car I am also simply another member of the clinical team, albeit one who happens to have spent an unreasonable portion of his adult life studying what happens when the human body decides to misbehave. Kevin was the old-school medic from Newark who had seen enough medicine to fill several textbooks and enough life to know that most emergencies become much less impressive after the third cup of coffee. Mike was the master plumber who had obtained his paramedic license later in life because he genuinely wanted to serve the town, and whose dry, sarcastic humor could probably be classified as a controlled substance in several states. Between the three of us, there was enough experience in that room to handle a substantial portion of the usual rural EMS workload without much fuss.

The Fly Car was waiting nearby, looking as absurdly overqualified as always. Calling it a department-issued vehicle would have been technically accurate but spiritually misleading. It was essentially a climate-controlled resuscitation bay on four wheels, engineered to make an emergency physician jealous and a hospital administrator nervous. Its custom slide-out trays carried low-titer O-positive whole blood and liquid plasma under controlled conditions, with rapid warming capability for patients experiencing catastrophic hemorrhage. Wireless ultrasound probes were paired with rugged tablets for focused cardiac, pulmonary, and abdominal assessment when the clinical question warranted it. Point-of-care laboratory equipment could rapidly provide glucose, electrolytes, and lactate. The medication inventory supported advanced resuscitation, while the airway compartment contained video laryngoscopy, advanced oxygenation equipment, and a turbine-driven transport ventilator capable of providing sophisticated lung-protective ventilation. Mechanical CPR equipment sat ready for cardiac arrest, and the trauma compartments contained equipment for highly specialized procedures that we hoped to use about as often as a surgeon hopes to perform an emergency thoracotomy in a parking lot. REBOA equipment, surgical airway supplies, escharotomy kits, and other specialized trauma equipment existed for the rare patient whose physiology justified their deployment. The important thing was not that we possessed all of it. The important thing was that we knew when not to use it.

At 4:05 p.m., the tones dropped.

“Attention Station 1: Medic 1, Engine 1 and Fly Car: Please respond to an 80-year-old male, vomiting.”

The dispatch information was almost comically nonspecific, but that is often how EMS begins. “Vomiting” can mean someone ate something disagreeable for lunch, or it can be the first observable manifestation of bowel obstruction, gastrointestinal hemorrhage, myocardial infarction, pancreatitis, intracranial hemorrhage, mesenteric ischemia, sepsis, toxicologic exposure, metabolic derangement, or an abdominal catastrophe that has been quietly developing for hours. In an 80-year-old, I take vomiting seriously because the physiologic reserve is different and the list of potentially dangerous causes is considerably longer than the dispatcher’s two words suggest.

I headed for the Fly Car while Kevin and Mike moved toward Medic 1, with Mike driving. Engine 1 pulled out ahead of them, lights and sirens going, the horn and Q siren making sure the entire neighborhood knew that the people who had been sitting in a common room watching the local news had suddenly become extremely interested in somebody else’s afternoon.

The address was a modest older home in a quiet residential area. When I arrived, the firefighters were already at the door. A family member met us and immediately told us that the patient had been vomiting repeatedly for several hours and “wasn’t acting quite right.” That last phrase is one of those deceptively casual statements that makes experienced clinicians pay closer attention. Families are often unable to describe a neurologic examination, but they are remarkably good at recognizing when somebody they have known for decades is behaving differently.

The patient was sitting upright in a recliner with a basin beside him. He was pale but not profoundly so, visibly uncomfortable, and intermittently retching. He was awake and able to answer questions, although his answers were slow. There was no obvious respiratory distress, no active hematemesis, and no dramatic external evidence of shock. Kevin and Mike were already beginning the primary assessment when I came in, and we worked around the patient rather than around titles. That is one of the things I value most about working with experienced paramedics: nobody needs to announce what they are doing. The assessment simply unfolds.

Primary Survey

• Airway: Patent; patient speaking in complete sentences between episodes of nausea.
• Breathing: Spontaneous and nonlabored; bilateral breath sounds present.
• Circulation: Peripheral pulses palpable; skin cool and mildly pale.
• Disability: Awake but fatigued; initially oriented to person and place, uncertain of the exact date.
• Exposure: No obvious trauma, significant bleeding, or rash.

His initial vital signs gave us the first real clue that this was more than a simple gastrointestinal complaint.

Vital Signs

• Heart rate: 104 beats/min
• Blood pressure: 108/64 mmHg
• Respiratory rate: 20/min
• SpO₂: 96% on room air
• Temperature: 99.1°F
• Blood glucose: 126 mg/dL
• ETCO₂: 33 mmHg

Nothing here screamed catastrophe, but the combination of advanced age, tachycardia, relatively soft blood pressure, cool skin, vomiting, and altered mentation was enough to make us slow down and think. The important question was whether the vomiting was the disease or merely the symptom of something else.

I started with the history, and the family member filled in several important details. The patient had been feeling poorly since the previous evening. He initially complained of vague upper abdominal discomfort and decreased appetite. By late morning he had developed repeated episodes of vomiting. There had been no obvious diarrhea. He had not reported eating anything unusual. The family had become concerned because he seemed increasingly weak and had twice nearly fallen while walking to the bathroom.

He denied chest pain, although that answer was not enough to remove cardiac pathology from the differential. Older patients frequently have atypical presentations of myocardial ischemia, and nausea and vomiting can be prominent manifestations of inferior myocardial infarction. His vague upper abdominal discomfort could easily have been gastrointestinal, but it could also have represented a cardiac equivalent.

We obtained a 12-lead ECG early.

There was sinus tachycardia with nonspecific ST-T changes but no diagnostic ST-segment elevation. There was no obvious STEMI pattern, no malignant dysrhythmia, and no high-grade conduction block. That was reassuring, but it did not close the cardiac chapter.

The abdominal examination was more interesting.

Secondary Assessment

• HEENT: Dry oral mucosa; no facial trauma; pupils equal and reactive.
• Neck: No jugular venous distention; no meningismus.
• Cardiovascular: Mild tachycardia with regular rhythm; peripheral pulses present but somewhat diminished.
• Pulmonary: Clear bilaterally without wheezing, rales, or focal diminished breath sounds.
• Abdomen: Mild upper abdominal distention with epigastric and periumbilical tenderness; no obvious rigidity or rebound; bowel sounds diminished.
• Pelvis: Stable and nontender.
• Extremities: Cool hands and feet; no unilateral edema; no focal extremity tenderness.
• Back: No significant costovertebral-angle tenderness.
• Neurologic: Awake, following commands, mildly disoriented to date, moving all extremities symmetrically without focal weakness or aphasia.

The abdominal findings moved bowel obstruction higher on the list, but the absence of peritoneal signs did not reassure me as much as it might have in a 25-year-old. Elderly patients can have surprisingly unimpressive abdominal examinations despite significant intra-abdominal disease, particularly early in the course or when the inflammatory response is muted.

We asked about bowel movements and flatus. He had not passed stool since the previous day and had passed very little gas. He described his abdomen as feeling “full.” That was useful information.

Now we had an elderly patient with progressive vomiting, abdominal distention, constipation, dehydration, and mild hemodynamic compromise.

Bowel obstruction was becoming a leading diagnosis.

But I was not willing to stop there.

The absence of severe abdominal pain did not eliminate mesenteric ischemia. In fact, one of the classic dangers of mesenteric ischemia is that the patient’s subjective symptoms can initially seem disproportionate to the physical examination. An elderly patient with vascular disease, vomiting, relatively soft blood pressure, and abdominal discomfort deserves consideration for impaired intestinal perfusion. Similarly, pancreatitis, cholecystitis, perforated viscus, gastrointestinal bleeding, and occult sepsis remained on the table.

And then there was the brain.

Vomiting in an elderly patient can be neurologic, particularly when accompanied by altered mentation, headache, or focal deficits. He had no focal neurologic findings and no headache, making intracranial hemorrhage considerably less likely, but again, the purpose of the differential is not to prove your favorite diagnosis. It is to keep dangerous alternatives alive until they can reasonably be excluded.

We obtained point-of-care laboratory testing.

Diagnostics

• Blood glucose: 126 mg/dL, making hypoglycemia an unlikely explanation for the altered mentation.
• Sodium: 136 mEq/L.
• Potassium: 3.5 mEq/L.
• Chloride: 99 mEq/L.
• Bicarbonate: 22 mEq/L.
• Creatinine: 1.3 mg/dL.
• Lactate: 3.1 mmol/L.
• Hemoglobin: 12.8 g/dL.
• Point-of-care cardiac ultrasound: Grossly preserved left ventricular systolic function; no pericardial effusion; no obvious severe right-heart dilation.
• Focused abdominal ultrasound: No obvious free intraperitoneal fluid; gallbladder without obvious large stones or marked wall thickening; abdominal aorta without obvious gross aneurysmal enlargement on the limited field assessment.

The lactate was elevated, and that mattered.

It was not a diagnostic stamp for mesenteric ischemia. Lactate is a marker of altered metabolism and perfusion, not a magical laboratory oracle. Tachycardia, dehydration, catecholamine release, and reduced circulating volume could all contribute. But in an elderly patient with abdominal symptoms and a lactate of 3.1 mmol/L, I wanted the receiving emergency department to know about it.

His creatinine was also mildly elevated relative to what the family believed was his usual baseline, suggesting at least some degree of volume depletion or acute kidney stress.

We started a controlled crystalloid infusion through peripheral IV access. The goal was not to flood an 80-year-old with liters of fluid because his blood pressure looked a little soft. The goal was to restore enough intravascular volume to improve perfusion while avoiding unnecessary volume overload, particularly in an elderly patient whose cardiac reserve was unknown.

Differential Diagnosis

1. Small-bowel or other mechanical intestinal obstruction: Most likely given progressive vomiting, abdominal distention, reduced bowel movements and flatus, and diminished bowel sounds.
2. Dehydration with hypovolemia secondary to gastrointestinal losses: Clearly present and contributing to tachycardia, cool extremities, and mild renal dysfunction.
3. Mesenteric ischemia: Important high-risk alternative because of age, abdominal symptoms, elevated lactate, and relative hemodynamic compromise.
4. Acute pancreatitis: Possible because of upper abdominal discomfort and vomiting, although the examination was not strongly characteristic.
5. Acute coronary syndrome with atypical presentation: Considered because elderly patients may present with nausea, vomiting, weakness, or epigastric discomfort rather than classic chest pain.
6. Biliary disease: Considered but less strongly supported by the examination and limited ultrasound.
7. Perforated viscus: Less likely because there was no peritonitis or free fluid identified, although prehospital ultrasound cannot exclude it.
8. Sepsis or intra-abdominal infection: Possible, particularly if obstruction had progressed to ischemia or bacterial translocation.
9. Intracranial pathology: Considered because of vomiting and mild confusion but substantially less likely without headache, focal neurologic findings, or altered consciousness.
10. Medication or metabolic toxicity: Considered but not strongly supported by the available history or laboratory findings.

Interventions

We established two peripheral IV lines, placed the patient on continuous cardiac monitoring, and maintained frequent blood-pressure measurements. A cautious isotonic crystalloid bolus was started because the clinical picture suggested volume depletion. We kept him upright initially because of the active vomiting and aspiration risk, while positioning the stretcher in a way that allowed rapid adjustment should his airway become compromised. Suction was immediately available. His oxygen saturation was adequate on room air, so supplemental oxygen was not necessary.

The medication treatment was similarly conservative and physiologically driven.

Medications

• Ondansetron 4 mg IV was administered for nausea and to reduce continued vomiting and aspiration risk.
• Normal saline 500 mL IV was administered cautiously for suspected hypovolemia, with reassessment of blood pressure, heart rate, lung examination, and overall perfusion afterward.
• No opioid analgesia was initially required because his discomfort was moderate and the abdominal examination was still evolving; avoiding unnecessary sedation also preserved the reliability of serial examinations.
• No empiric antibiotics were administered in the field because there was not yet convincing evidence of sepsis or a specific intra-abdominal infection requiring immediate prehospital antimicrobial therapy.
• No antiarrhythmic or vasoactive medication was indicated.
• No advanced airway intervention was required because he maintained his airway and had adequate ventilation.

After the fluid bolus, his heart rate decreased modestly and his blood pressure improved.

Reassessment

• Heart rate: 94 beats/min.
• Blood pressure: 118/68 mmHg.
• Respiratory rate: 18/min.
• SpO₂: 97% on room air.
• ETCO₂: 35 mmHg.
• Mental status: More alert and correctly oriented to date.
• Skin: Improved peripheral warmth.
• Abdomen: Persistent mild distention and epigastric/periumbilical tenderness without peritoneal signs.
• Nausea: Improved after ondansetron, with no further vomiting during our reassessment.
• ECG: Sinus rhythm without evolving ischemic changes.

That improvement was reassuring, but it did not change the destination.

He still needed a hospital.

There are certain cases where EMS can identify the problem and essentially finish the medical workup in the field. This was not one of them. An elderly patient with possible bowel obstruction, elevated lactate, dehydration, abdominal distention, and altered mentation requires laboratory testing beyond what we can reasonably perform prehospital, formal abdominal imaging, and potentially surgical consultation. If this was an obstruction, the patient might require nasogastric decompression, CT imaging, electrolyte correction, antibiotics if ischemia or infection emerged, and potentially operative intervention.

If this was mesenteric ischemia, the stakes were considerably higher.

If this was an atypical myocardial infarction, he needed serial troponins and further cardiac evaluation.

The point was that we had narrowed the field, but we had not reached the finish line.

And that was perfectly acceptable.

Transport Decision and Clinical Destination

Medic 1 transported the patient to the emergency department for definitive evaluation of acute vomiting with abdominal distention, dehydration, mild altered mentation, and an elevated lactate. The transport did not require physician-level intervention. He was hemodynamically responsive to a modest fluid challenge, maintained his airway, had no malignant dysrhythmia, no focal neurologic deficit, no severe respiratory compromise, and no evidence of immediate shock requiring advanced resuscitation.

I therefore did not accompany the transport.

Kevin and Mike had this.

They continued the monitoring, maintained IV access, reassessed his abdomen and mental status, and were fully capable of recognizing any deterioration during transport. If the patient had become hypotensive despite fluid resuscitation, developed peritoneal signs, suffered a dysrhythmia, developed altered mental status, or otherwise demonstrated evidence of rapidly progressive intra-abdominal catastrophe, the equation would have changed and I would have gone with them.

But he did not.

The call remained within the capabilities of two experienced paramedics.

That is one of the most satisfying parts of working as a physician-paramedic. My role is not to insert myself into every call simply because I can. My role is to recognize when my additional training changes the level of care required and when it does not. Sometimes the most appropriate thing I can do is perform the initial assessment, contribute to the differential, help establish the treatment strategy, and then step back while two excellent paramedics take the patient where he needs to go.

Before Medic 1 left, I gave Kevin and Mike a concise handoff emphasizing the lactate, mild creatinine elevation, abdominal distention, lack of bowel movement and flatus, initial mild disorientation, ECG findings, response to fluids, and the concern for mechanical obstruction with mesenteric ischemia remaining an important alternative diagnosis. They acknowledged the plan, closed the doors, and headed toward the hospital.

I watched them pull away and found myself thinking about how deceptive the dispatch complaint had been.

“Vomiting.”

Two words.

That’s it.

Yet inside those two words was a differential diagnosis that included intestinal obstruction, dehydration, mesenteric ischemia, pancreatitis, biliary disease, acute coronary syndrome, sepsis, metabolic disease, and neurologic pathology. This is why experienced EMS clinicians do not simply treat the complaint. We investigate the physiology behind it.

By the time I returned to the station, the afternoon had returned to its previous quiet state. The common room television was still on. The local news had moved on to another story. The coffee was still sitting where we had left it, now well past the point at which any reasonable person would describe it as fresh. The chairs were empty for the moment, and the station had that strange post-call stillness that follows an otherwise routine transport.

I sat down and thought about the patient.

There is a tendency to associate sophisticated prehospital medicine with dramatic interventions: intubations, massive transfusion, vasopressors, mechanical CPR, emergency surgery, and all the other things that make a Fly Car look like somebody parked an ICU in a rural fire station. But most of good medicine is considerably less theatrical.

It is noticing that an 80-year-old who is “just vomiting” is tachycardic.

It is recognizing that cool skin and a soft blood pressure may represent early volume depletion.

It is remembering that a lactate of 3.1 mmol/L is a clue rather than a diagnosis.

It is understanding that an elderly patient can have serious abdominal pathology without a textbook peritoneal examination.

It is remembering that nausea can be an anginal equivalent.

It is asking about bowel movements and flatus.

It is obtaining an ECG even when the patient denies chest pain.

It is using ultrasound when it can answer a useful question, rather than simply because an ultrasound probe happens to be sitting in the vehicle.

And it is knowing when the patient needs a hospital, while also knowing when the patient does not need the physician-paramedic sitting beside him for the entire ride.

Kevin and Mike were more than capable of finishing that call.

They had assessed the patient, identified the dangerous possibilities, treated the immediate physiologic problems, and transported him for definitive evaluation. That is exactly what a high-functioning EMS system should look like.

As for me, I had another cup of coffee waiting at the station.

It was terrible.

But after an afternoon of vomiting, lactate, abdominal pathology, and differential diagnosis, even terrible coffee seemed strangely therapeutic

A Head Injury, a Tree Crew, and Knowing When to Let the Paramedics Run the Call: A Physician-Paramedic Afternoon

Late August afternoons at our rural Fire/EMS station have a particular rhythm, and on this particular day that rhythm had been almost hypnotic. The bay doors were open, the apparatus was sitting ready, the coffee was still reasonably fresh, and Kevin, Mike, and I had settled into lawn chairs outside the station with the sort of false confidence that comes from believing you might actually get through an afternoon without the radio interrupting you. Across the street, the town was cutting down several trees, which gave us something to watch and comment upon with the highly specialized expertise possessed by three people sitting in lawn chairs. Kevin had his trademark cigar, Mike had his cigarette, and I was once again pretending not to notice either of them. I have discovered over the years that being the EMS Medical Director and Commander comes with certain responsibilities, but apparently one of those responsibilities is also developing selective visual impairment whenever Mike lights a cigarette ten feet from me. We were drinking coffee, watching the tree crew work, and generally enjoying the kind of quiet that is never quite as relaxing for people in EMS as it is for everybody else.

I was also enjoying being off from my usual work as a trauma and critical care surgeon. My regular life involves a great deal of physiology, hemorrhage, ventilators, operating rooms, intensive care units, and the peculiar ability of a telephone call at 3:00 in the morning to turn a perfectly reasonable night’s sleep into a distant memory. Volunteering with our rural Fire/EMS department is different. I serve as both the medical director and Commander of EMS, and when I am on the Fly Car I am also a licensed paramedic working alongside the rest of the crew. The distinction matters because I do not show up to every call believing that because I am a physician I should automatically take command of the patient’s care. Kevin and Mike are experienced paramedics. They know how to assess patients, recognize deterioration, establish treatment priorities, and transport safely. They also know that if a patient’s physiology crosses into territory requiring physician-level intervention, I am there. The relationship works precisely because there is no competition over who gets to be the smartest person in the ambulance. The patient gets the smartest team available, and everybody else can leave their ego at the station.

The Fly Car sitting inside the bay reflected the same philosophy, albeit in a somewhat ridiculous manner. It was essentially a climate-controlled resuscitation bay on four wheels, equipped far beyond what one normally associates with rural EMS. Custom slide-out trays contained low-titer O-positive whole blood and plasma maintained at controlled temperatures, with rapid warming equipment available for catastrophic hemorrhage. Wireless ultrasound probes could communicate directly with rugged tablets, allowing us to examine the heart, lungs, and selected abdominal structures when the clinical question warranted it. Point-of-care laboratory equipment could provide glucose, electrolytes, and lactate rapidly. The medication inventory was capable of supporting advanced resuscitation, including specialized antidotes and reversal agents, advanced airway medications, and other therapies that would be extraordinary to find in a conventional ambulance. Video laryngoscopy, transport ventilation, mechanical CPR, surgical airway equipment, and specialized trauma capabilities completed the package. There were even resources for highly selected interventions such as REBOA and other procedures that belong firmly in the category of “I hope we never need this.” The equipment was impressive, but the real point was not having a mobile toy chest. It was having the right resource available when the physiology demanded it.

At 2:47 p.m., the tones dropped.

“Attention Station 1: Medic 1, Engine 1 and Fly Car: Please respond to a 20-year-old male, fallen with head injury.”

The afternoon changed immediately.

I grabbed my gear and headed toward the Fly Car while Kevin and Mike moved for Medic 1. Kevin was driving, and Engine 1 pulled out ahead of them, lights flashing, siren running, horn and Q siren announcing our departure to the surrounding neighborhood. I followed behind them, already running through the differential in my head.

A 20-year-old with a fall and head injury could be almost anything. A simple scalp laceration. Concussion. Subdural hematoma. Epidural hematoma. Traumatic subarachnoid hemorrhage. Cerebral contusion. Diffuse axonal injury. Cervical spine injury. Skull fracture. Seizure preceding the fall. Syncope preceding the fall. Intoxication. Hypoglycemia. Dysrhythmia. A cardiac event would be less likely at that age but certainly not impossible. The mechanism mattered, but so did the circumstances surrounding the fall, because a head injury is sometimes the consequence rather than the cause of the patient’s altered state.

When we arrived, Engine 1 was already positioned near the house. The patient was on the ground beside a set of exterior steps, with several people nearby. The firefighters had begun clearing the immediate area and were obtaining the basic history while we brought the stretcher and equipment forward. The patient was awake, which was immediately reassuring, but he was holding the back of his head and looked uncomfortable. There was a small amount of blood in his hair, and the mechanism appeared to have involved a fall down several steps rather than a simple trip on level ground.

I walked over with Kevin and Mike, and we immediately started working the patient together.

Primary Survey

• Airway: Patent; patient speaking clearly without obstruction.
• Breathing: Spontaneous, regular, and without obvious respiratory distress.
• Circulation: Strong radial pulses with normal peripheral perfusion; no evidence of major external hemorrhage.
• Disability: Awake and responsive, GCS 14 initially because of mild confusion regarding the circumstances of the fall.
• Exposure: Small occipital scalp laceration and localized tenderness; no obvious major extremity or torso trauma.

The initial GCS of 14 was not something I intended to ignore. A young person who falls and strikes his head can look remarkably well while still having an intracranial injury developing beneath the skull. The brain is particularly unforgiving of complacency. The absence of dramatic neurologic findings does not exclude hemorrhage, and the fact that someone is talking to you does not grant them immunity from an epidural or subdural hematoma.

I asked him what happened.

He remembered walking down the steps, then losing his footing. He remembered striking the back of his head. He denied losing consciousness, although his recollection around the actual impact was somewhat incomplete. He denied seizure activity, chest pain, palpitations, shortness of breath, and preceding dizziness. He had no obvious alcohol odor, no evidence of significant intoxication, and no witnesses reporting abnormal behavior before the fall.

The story was becoming reassuring, but we were not finished.

Vital Signs

• Heart rate: 88 beats/min
• Blood pressure: 132/78 mmHg
• Respiratory rate: 16/min
• SpO₂: 99% on room air
• Temperature: 98.1°F
• Blood glucose: 101 mg/dL
• ETCO₂: 37 mmHg

His vital signs were entirely reasonable. There was no hypertension suggestive of a major intracranial pressure problem, no bradycardia, no hypoxemia, and no abnormal respiratory pattern. His glucose was normal, which made hypoglycemia as a precipitating cause unlikely.

Then came the examination.

Secondary Assessment

• HEENT: Approximately 2-cm occipital scalp laceration with localized tenderness and mild swelling; no obvious depressed skull defect; pupils equal and reactive.
• Neck: Midline cervical tenderness absent; no deformity; neurologically intact distal to the cervical spine.
• Cardiovascular: Regular rhythm with strong peripheral pulses; no obvious murmur.
• Pulmonary: Clear bilateral breath sounds with symmetric chest excursion.
• Abdomen: Soft and nontender without guarding or rigidity.
• Pelvis: Stable and nontender.
• Extremities: Full active movement of all extremities; no deformity or significant tenderness.
• Back: No significant midline thoracic or lumbar tenderness.
• Neurologic: GCS improved to 15 during reassessment; oriented to person, place, time, and situation; speech clear; facial symmetry intact; no pronator drift; equal grip strength; grossly symmetric sensation; no focal motor deficit.

The scalp wound was not particularly impressive. Scalp lacerations can bleed dramatically because the scalp is richly vascularized, but the amount of external blood tells us very little about what is happening inside the skull. A two-centimeter laceration can produce a mess without producing significant physiologic compromise, while an intracranial hemorrhage can produce almost no external evidence whatsoever.

I palpated the occipital region carefully. There was tenderness and swelling but no palpable step-off or obvious depressed fracture. His pupils were normal. His extraocular movements were intact. He had no facial asymmetry and no lateralizing motor deficit.

We then went through the mechanism again. He had fallen backward down several steps, striking the occipital region against the edge of one of the steps before coming to rest on the ground. There was no report of prolonged loss of consciousness, no seizure, and no anticoagulant use.

That was reassuring.

It was not permission to become complacent.

We moved him onto the stretcher, maintaining appropriate spinal precautions based on the mechanism and examination rather than treating every patient with a head injury as though they had automatically sustained an unstable cervical fracture. Modern trauma care requires judgment. Immobilization itself has consequences, and the decision should be based on mechanism, symptoms, examination, mental status, and applicable clinical criteria.

Once he was settled, we repeated the neurologic examination. He remained GCS 15.

Diagnostics

Because he was stable, there was no indication to turn the scene into a mobile intensive-care unit simply because I happened to have one available. POCUS has tremendous value in the right patient, but it is not a substitute for CT in evaluating intracranial hemorrhage. A normal cardiac ultrasound does not rule out a brain injury, and a normal lung ultrasound tells me nothing meaningful about an epidural hematoma. The appropriate diagnostic tool for suspected intracranial hemorrhage is hospital-based neuroimaging.

We therefore used the tools that actually answered the questions we had in front of us.

• Blood glucose: 101 mg/dL, excluding hypoglycemia as an obvious metabolic precipitant.
• Serial neurologic examinations: Stable GCS 15 with no focal deficit.
• Pupillary examination: Equal and reactive bilaterally.
• POCUS cardiac assessment: Grossly preserved cardiac activity without obvious pericardial effusion, obtained because the history initially left a small question about whether a syncopal event could have preceded the fall.
• POCUS pulmonary assessment: Bilateral lung sliding present without evidence of pneumothorax.
• Continuous ECG monitoring: Sinus rhythm without significant dysrhythmia.
• No prehospital CT: Not available and not clinically necessary at the scene; definitive neuroimaging would occur at the receiving hospital based on the patient’s risk assessment.

The differential diagnosis remained appropriately broad.

Differential Diagnosis

1. Concussion/mild traumatic brain injury: Most likely given the mechanism, transient confusion, headache, and absence of focal neurologic deficits.
2. Intracranial hemorrhage: Must be considered despite a reassuring examination because traumatic subdural, epidural, or subarachnoid bleeding can initially present with relatively subtle findings.
3. Occipital skull fracture: Possible given the direct impact and localized tenderness, although no obvious depressed defect was palpable.
4. Cervical spine injury: Considered because of the fall mechanism but less likely given the absence of midline tenderness, neurologic deficit, or significant neck symptoms.
5. Syncope preceding the fall: Considered because the history surrounding the actual loss of balance was imperfect, although there was no preceding chest pain, palpitations, dyspnea, or documented dysrhythmia.
6. Seizure preceding the fall: Considered but not supported by the history, examination, or witness account.
7. Hypoglycemia or metabolic disturbance: Unlikely with normal glucose and no systemic features suggesting metabolic collapse.
8. Intoxication: Not clinically apparent on examination.
9. Simple mechanical fall with scalp laceration: Possible, but the transient confusion and head impact warranted hospital evaluation regardless.

We controlled the scalp bleeding with direct pressure and dressed the wound. There was no indication for aggressive hemorrhage management, blood products, or any of the more exotic capabilities sitting inside the Fly Car. The whole blood remained exactly where I wanted it: in its temperature-controlled compartment, unused.

Interventions

• Continuous cardiac monitoring.
• Pulse oximetry and serial blood-pressure monitoring.
• Serial neurologic examinations.
• Cervical spine precautions based on mechanism and clinical assessment.
• Direct pressure to scalp wound.
• Sterile dressing applied to occipital laceration.
• IV access established in anticipation of transport and potential hospital treatment.
• Patient positioned comfortably with head and torso appropriately elevated.
• Serial reassessment for deterioration, vomiting, worsening headache, seizure activity, or neurologic change.
• No advanced airway intervention indicated.
• No POCUS-guided invasive procedure indicated.
• No blood products indicated.
• No mechanical ventilation indicated.

The patient complained of a headache that he described as moderate rather than severe. He denied nausea initially but developed mild nausea while we were preparing for transport.

That was enough for us to address his symptoms while avoiding anything that would cloud the neurologic examination.

Medications

• Ondansetron 4 mg IV was administered for nausea.
• Acetaminophen 1,000 mg PO was considered appropriate for headache control given the stable examination and absence of contraindication.
• No opioid analgesia was administered because narcotics could complicate serial neurologic assessment and were unnecessary for his level of discomfort.
• No benzodiazepine was indicated because there was no seizure activity.
• No hypertonic saline or other intracranial-pressure therapy was indicated because there was no evidence of herniation or clinically significant intracranial hypertension.
• No antibiotics were indicated because the scalp wound was uncomplicated and there was no evidence of an open depressed skull fracture or gross contamination requiring prehospital antimicrobial therapy.

The patient’s condition remained stable throughout our reassessment. His GCS stayed at 15, his pupils remained equal and reactive, and his headache did not suddenly worsen. He did not vomit. He did not develop weakness, aphasia, seizure activity, or altered mental status.

Reassessment

• HR: 84 beats/min.
• BP: 128/76 mmHg.
• RR: 16/min.
• SpO₂: 99% on room air.
• ETCO₂: 37 mmHg.
• GCS: 15.
• Pupils: Equal and reactive.
• Motor: Symmetric movement of all extremities.
• Sensation: Grossly intact.
• Headache: Stable to mildly improved.
• Nausea: Improved following ondansetron.
• No recurrent loss of consciousness or seizure activity.

At this point, the decision about whether I would accompany the patient became relatively easy.

He needed transport.

He did not need me.

That distinction is important, particularly when you are a physician-paramedic working inside an EMS system that has deliberately built a culture around paramedic autonomy. There is a peculiar temptation among physicians in prehospital environments to equate their presence with necessity. I have never found that particularly useful. If a patient is stable, if the paramedics are entirely capable of managing the clinical problem, and if there is no reasonable expectation that physician-level intervention will be required during transport, then the physician-paramedic should sometimes step back.

This was one of those calls.

Kevin and Mike had this.

They had performed an appropriate assessment, recognized the potential seriousness of the mechanism, maintained a careful neurologic examination, controlled the obvious injury, monitored the patient, and identified the need for definitive hospital evaluation. Nothing about the case suggested impending airway failure, refractory shock, intracranial herniation, uncontrolled seizure, malignant dysrhythmia, or another condition that would require my presence in the ambulance.

Transport Decision and Clinical Destination

The patient was transported by Medic 1 to the emergency department for definitive evaluation of mild traumatic brain injury and exclusion of clinically significant intracranial injury. Hospital evaluation was appropriate because of the head impact, transient confusion, persistent headache, and mechanism of injury, even though the patient remained neurologically intact. The receiving team would determine the need for CT imaging, wound repair, observation, and additional testing based on the complete history and examination.

I did not accompany the transport.

That was not because the call was unimportant.

It was because the call was appropriately within Kevin and Mike’s capabilities.

There is an important distinction between physician-level medicine being available and physician-level medicine being necessary. Our EMS system is strongest when we can tell the difference.

As Medic 1 prepared to leave, I gave Kevin and Mike the information I wanted carried forward: the mechanism, the initial GCS of 14 with rapid improvement to 15, the absence of focal neurologic findings, the scalp laceration, the stable vital signs, the medication administered, and the need for serial neurologic observation during transport. They acknowledged it, closed the doors, and headed toward the hospital.

Engine 1 returned to quarters.

The Fly Car followed shortly afterward.

And within a few minutes, the entire emergency had disappeared from the road behind us.

When I pulled back into the station, the tree crew was still working across the street. The same trees were being cut down. The same trucks were parked along the road. The afternoon sun was still shining. The coffee cups were still sitting on the table beside our chairs, although the coffee had crossed the invisible line between “strong” and “industrial solvent” while we were gone.

Kevin and Mike would eventually return after completing the hospital transfer and restocking Medic 1.

I sat back down.

That is the odd rhythm of volunteer EMS. One minute you are sitting in a lawn chair watching somebody cut down trees across the street, half-listening to Mike make some sarcastic observation about municipal tree maintenance, and the next minute you are standing over a 20-year-old with a head injury trying to determine whether a seemingly benign fall has produced a potentially lethal intracranial injury.

The physiology does not care what you were doing five minutes earlier.

And that is probably the part of this work I enjoy most.

Being a physician-paramedic means having access to an enormous amount of knowledge and, occasionally, an enormous amount of equipment. It means being able to recognize the patient who needs an airway, blood, ultrasound, vasoactive support, advanced trauma intervention, or some other escalation of care. It also means recognizing the patient who does not need those things.

That second skill is every bit as important.

The young man across the street had suffered a head injury. He deserved a careful examination, appropriate precautions, monitoring, and hospital evaluation. He did not need a physician standing beside him for the entire transport simply because one happened to be available. Kevin and Mike were capable, experienced paramedics, and they demonstrated exactly why.

The Fly Car remained ready.

The blood stayed cold.

The ventilator stayed unused.

The ultrasound probes went back into their compartment.

The surgical equipment remained sealed.

And that was a good afternoon.

Because in emergency medicine, sometimes the most successful call is the one where all of your most extraordinary equipment remains exactly where you left it, while three clinicians quietly do the ordinary things exceptionally well.

The Bus Stop, Chest Pain, and Another Day as a Physician-Paramedic

There is a particular kind of quiet that settles over a fire station in the early afternoon, especially in late August when the heat has taken some of the enthusiasm out of everybody and the open bay doors let the outside world drift into the apparatus floor. It was one of those afternoons. Kevin, Mike, and I were sitting outside the bay in lawn chairs, drinking coffee and doing very little that could be mistaken for productive activity. Kevin had his trademark cigar going, Mike had a cigarette between his fingers, and I was pretending not to notice either of them, although in fairness I was also drifting in and out of sleep. There is a point during a long EMS shift when the body decides that the chair is actually a piece of medical equipment designed specifically for horizontalizing an exhausted physician-paramedic, and I had apparently reached that stage.

The conversation had become vague and pleasantly meaningless. Nobody was discussing anything particularly important. We had already solved most of the world’s problems earlier in the morning, or at least convinced ourselves that we had. The apparatus was checked, the ambulances were stocked, the Fly Car was ready, and for the moment there was nothing demanding our attention. I serve as both the EMS Medical Director and Commander of EMS for our Fire/EMS department, but despite those titles I have never believed that sitting around the station wearing an imaginary crown makes me clinically superior to the people sitting beside me. Kevin and Mike are experienced paramedics. They know their medicine. They know their town. They know their patients. My job when I am working alongside them is to contribute another perspective, not to interfere simply because I happen to have an MD after my name. If a patient needs physician-level intervention, I am there. If the call remains comfortably within the scope of excellent paramedic practice, I am perfectly happy letting excellent paramedics practice medicine.

The Fly Car waiting in the bay was, as usual, a ridiculous monument to the idea that somebody somewhere had decided that rural EMS should occasionally resemble a mobile tertiary-care center. It was a climate-controlled resuscitation bay on four wheels, with temperature-controlled low-titer O-positive whole blood and plasma, rapid blood warming capability, wireless ultrasound, point-of-care laboratory equipment, advanced airway equipment, transport ventilation, mechanical CPR, sophisticated medication capabilities, and specialized equipment for the occasional catastrophic trauma that makes the rest of us question why we ever volunteered for this in the first place. There are capabilities on that vehicle that we might go months without using, and that is exactly how I prefer it. Advanced equipment should sit untouched until the physiology demands it. There is no prize for opening the most expensive drawer.

At 1:09 p.m., the tones dropped.

“Attention Station 1: Medic 1, Engine 1 and Fly Car: Please respond to a 35-year-old male, chest pain. At the bus stop.”

I was awake immediately.

There are certain dispatches that cause every clinician to mentally shift gears. Chest pain is one of them. A 35-year-old is young enough that the probability of an acute coronary occlusion is lower than it would be in a 65-year-old, but “young” is not a synonym for “safe.” Cocaine, amphetamines, myocarditis, spontaneous coronary artery dissection, pulmonary embolism, aortic pathology, dysrhythmia, pericarditis, pneumothorax, and a long list of noncardiac conditions can produce chest discomfort in someone who has not yet accumulated decades of atherosclerotic disease.

And then there was the location.

The bus stop.

Our one and only bus stop has developed something of a reputation. In theory, it is simply a place where people get on and off a bus. In practice, it seems to function as the rural portal through which every conceivable social complication occasionally arrives in town. People come in from elsewhere, people leave town, people wait for connections, people argue, people drink, people use drugs, people become intoxicated, and occasionally somebody manages to combine several of those activities into a single EMS call.

So when dispatch says “35-year-old male, chest pain, bus stop,” there are several possibilities, and acute coronary syndrome is only one of them.

I headed for the Fly Car while Mike drove Medic 1 and Kevin rode with him. Engine 1 was behind us, lights flashing, siren running, horn and Q siren announcing our collective arrival to anyone within earshot.

As we approached the bus stop, the police were already there. They tend to appear whenever the bus stop becomes involved in anything more complicated than somebody quietly reading the schedule. On this occasion, they were standing nearby rather than actively intervening, which was reassuring. There was no fight, no crowd, no obvious weapon, and no immediate safety issue.

The patient was sitting on the bench beneath the shelter, leaning forward with his elbows on his knees. At first glance, he looked uncomfortable rather than critically ill. He was awake and talking. His skin was slightly flushed, his speech had a mild slur, and there was a strong odor of alcohol. He was clutching the center of his chest and telling us that it felt like his heart was “beating all wrong.”

That sentence got my attention more than the word chest pain.

Kevin and Mike were already moving into the initial assessment. I joined them, and we worked the patient together.

Primary Survey

• Airway: Patent; patient speaking spontaneously.
• Breathing: Spontaneous and unlabored, with symmetric chest movement.
• Circulation: Strong peripheral pulses; skin warm with mildly flushed appearance.
• Disability: Awake but mildly intoxicated; oriented to person, place, and situation.
• Exposure: No obvious trauma, diaphoresis, cyanosis, or external bleeding.

His first impression was that of an intoxicated man with chest discomfort and a subjective sense of palpitations. That did not permit us to dismiss the complaint. Alcohol and recreational drugs can coexist with genuine cardiovascular pathology, and intoxication can make the history considerably less reliable.

His vital signs were obtained.

Vital Signs

• Heart rate: 118 beats/min, irregular
• Blood pressure: 146/88 mmHg
• Respiratory rate: 20/min
• SpO₂: 98% on room air
• Temperature: 98.4°F
• Blood glucose: 108 mg/dL
• ETCO₂: 36 mmHg

The irregular tachycardia immediately moved dysrhythmia higher on the list.

We obtained a 12-lead ECG.

It showed a narrow-complex tachyarrhythmia with an irregular ventricular response, consistent with atrial fibrillation with rapid ventricular response. There were no convincing acute ST-segment elevations, no obvious STEMI pattern, and no broad-complex ventricular tachycardia.

That changed the character of the call.

The patient wasn’t simply complaining of vague chest discomfort. He had an objective cardiac rhythm abnormality.

The next question was why.

His history began to fill in some uncomfortable gaps.

He had been drinking heavily. He initially described it as “a couple beers,” which, based on the smell of him and the obvious impairment, was probably one of those mathematically creative measurements of alcohol consumption that occasionally appear in EMS history-taking. Eventually, with some gentle questioning, he admitted to drinking substantially more and using cocaine earlier in the day.

There it was.

Alcohol plus cocaine plus tachyarrhythmia plus chest discomfort.

Suddenly the differential became much more coherent.

Cocaine is a potent sympathomimetic. It increases catecholaminergic activity, produces tachycardia and hypertension, increases myocardial oxygen demand, and can cause coronary vasoconstriction. It can also promote platelet activation and thrombosis. Add alcohol to the equation and the patient may also have impaired judgment, altered autonomic physiology, dehydration, electrolyte abnormalities, and a metabolically complicated picture.

The cocaine did not prove that his chest pain was noncardiac.

If anything, it made me more interested in his heart.

We moved him onto the stretcher and into Medic 1 for a more complete evaluation.

Secondary Assessment

• HEENT: Pupils mildly dilated and reactive; oral mucosa somewhat dry; no facial trauma.
• Neck: No jugular venous distention; trachea midline.
• Cardiovascular: Tachycardic and irregular rhythm; peripheral pulses preserved; no obvious murmur.
• Pulmonary: Clear bilateral breath sounds without wheezing, rales, or asymmetric air entry.
• Abdomen: Soft and nontender; no guarding or rigidity.
• Pelvis: Stable without evidence of trauma.
• Extremities: Warm and perfused; no unilateral swelling or calf tenderness.
• Back: No significant tenderness or evidence of injury.
• Neurologic: Mildly intoxicated but following commands; no focal motor deficit, facial asymmetry, or obvious aphasia.

His neurologic examination was particularly reassuring. There was no evidence of an acute intracranial catastrophe, although cocaine use always makes me pay attention to neurologic findings because severe hypertension and vasoconstriction can contribute to cerebrovascular events.

We obtained another ECG after moving him into the ambulance.

The rhythm remained atrial fibrillation with a ventricular rate around 120.

The temptation in any tachyarrhythmia is to treat the number.

That is not how I approach it.

A heart rate of 120 is not itself a disease. The question is whether the rhythm is producing hemodynamic instability, myocardial ischemia, pulmonary edema, altered mental status, or another manifestation of cardiovascular compromise.

He had none of those.

His blood pressure was preserved. He was breathing normally. His oxygenation was excellent. There was no pulmonary edema. He was awake. His chest discomfort was present but not accompanied by convincing ischemic ECG changes.

That meant there was no indication for immediate synchronized cardioversion.

Diagnostics

• 12-lead ECG: Atrial fibrillation with rapid ventricular response, narrow QRS complexes, no diagnostic ST-segment elevation.
• Repeat ECG: Persistent atrial fibrillation without evolving ischemic changes.
• Blood glucose: 108 mg/dL.
• POC sodium: 139 mEq/L.
• POC potassium: 3.7 mEq/L.
• Ionized calcium: 1.18 mmol/L.
• Creatinine: 0.9 mg/dL.
• POC lactate: 2.4 mmol/L.
• POCUS cardiac assessment: Grossly preserved left ventricular systolic function; no pericardial effusion; no obvious right-ventricular dilation suggesting massive pulmonary embolism.
• POCUS pulmonary assessment: Bilateral lung sliding present with no sonographic evidence of pneumothorax or significant pulmonary edema.

The mildly elevated lactate was not surprising. Tachycardia, catecholamine excess, exertion, dehydration, and sympathomimetic exposure can all contribute. There was no hypotension or evidence of systemic hypoperfusion to suggest that the lactate represented shock.

The potassium was technically within an acceptable range but toward the lower end. In a patient with an atrial arrhythmia and stimulant exposure, it was worth paying attention to, although not low enough to explain the entire presentation.

The ultrasound was also useful, not because it diagnosed the problem, but because it helped exclude several immediately dangerous alternatives. There was no obvious large pericardial effusion, no gross right-heart strain pattern, no pulmonary edema, and no pneumothorax.

Still, the central issue remained the same: chest discomfort in the setting of stimulant exposure and atrial fibrillation.

Differential Diagnosis

1. Cocaine-associated sympathomimetic cardiovascular toxicity: Most likely given the history, tachycardia, atrial fibrillation, and chest discomfort.
2. Cocaine-associated coronary vasospasm or acute coronary syndrome: Clinically important despite the absence of ST elevation because stimulant-associated ischemia can occur through vasospasm, increased oxygen demand, and thrombosis.
3. Alcohol-associated atrial fibrillation: Possible, particularly with significant alcohol consumption and dehydration.
4. Primary paroxysmal atrial fibrillation: Possible, although the temporal relationship with substance use made a secondary trigger more likely.
5. Electrolyte disturbance: Considered but not strongly supported by point-of-care testing.
6. Pulmonary embolism: Considered because of chest pain and tachycardia, but there were no strong historical or examination features suggesting it, and POCUS did not show an obvious massive PE pattern.
7. Pneumothorax: Unlikely given bilateral breath sounds and preserved lung sliding.
8. Acute aortic syndrome: Considered because stimulant exposure can produce severe hypertension and vascular injury, but there was no tearing chest pain, pulse deficit, neurologic deficit, or marked blood-pressure differential to suggest it.
9. Alcohol-related gastritis or esophageal irritation: Possible contributor to discomfort but insufficient to explain the documented dysrhythmia.

The treatment plan was deliberately restrained.

Interventions

• Continuous ECG monitoring.
• Serial 12-lead ECG acquisition.
• Peripheral IV access.
• Pulse oximetry and ETCO₂ monitoring.
• Patient placed in a position of comfort with close observation.
• Point-of-care laboratory assessment.
• Point-of-care cardiac and pulmonary ultrasound.
• Serial blood-pressure measurements.
• Removal from the stimulating environment of the bus stop and placement in a controlled ambulance environment.
• No synchronized cardioversion because he remained hemodynamically stable.
• No aggressive IV fluid administration because there was no hypotension or clear clinically significant volume depletion.
• No empiric anticoagulation in the field without a clearer indication and hospital-level assessment.
• Continued monitoring for development of ischemia, worsening tachyarrhythmia, hypertension, altered mental status, or respiratory deterioration.

The question of medication was more nuanced.

Because the patient had cocaine-associated symptoms, the traditional reflex of reaching immediately for a beta-blocker is not something I would casually do in the field. Acute stimulant toxicity requires attention to the catecholaminergic state, coronary vasoconstriction, blood pressure, rhythm, and overall clinical picture. Treatment should be driven by physiology rather than an isolated heart rate.

He did not require sedation, advanced airway management, vasopressors, antiarrhythmic rescue, or cardioversion.

Medications

• Aspirin 324 mg PO was administered because chest discomfort remained a concern for possible coronary ischemia and there was no known aspirin allergy, active bleeding, or other immediate contraindication.
• No benzodiazepine was required because he was cooperative, not severely agitated, and did not have severe sympathomimetic agitation or uncontrolled hypertension.
• No beta-blocker was administered in the prehospital setting.
• No antiarrhythmic medication was required because he remained stable and the rhythm was likely provoked by an acute reversible toxicologic trigger.
• No nitroglycerin was administered because his blood pressure was adequate and his discomfort was mild and improving, with no clear hypertensive or ischemic indication requiring immediate vasodilator therapy.

As always, the precise treatment of stimulant-associated chest pain and atrial fibrillation depends on the patient’s physiology, local protocols, medical control, contraindications, and available resources. The important point here was that he did not need us to turn a stable patient into an unstable one through unnecessary intervention.

Over the next several minutes, his heart rate began drifting downward.

His chest discomfort improved.

His blood pressure remained stable.

His level of intoxication remained unchanged but he became more conversational, and the previously dramatic description of his heart “beating all wrong” became more accurately described as a sensation of intermittent racing and pounding.

Reassessment

• HR: 104-112 beats/min, still irregular.
• BP: 138/82 mmHg.
• RR: 18/min.
• SpO₂: 98% on room air.
• ETCO₂: 37 mmHg.
• Chest discomfort: Improved substantially.
• Mental status: Awake, cooperative, mildly intoxicated but without deterioration.
• ECG: Persistent atrial fibrillation with improved ventricular rate and no evolving ST-segment elevation.
• Pulmonary examination: Remained clear.
• POCUS: No interval concerning findings.

At that point, the clinical picture had become fairly straightforward.

This was not a STEMI.

This was not cardiogenic shock.

This was not unstable atrial fibrillation.

This was not a massive pulmonary embolism.

This was not an airway emergency.

It was a 35-year-old man who had combined alcohol and cocaine exposure, developed atrial fibrillation with a rapid ventricular response, and experienced chest discomfort in the process.

That still required hospital evaluation.

The word “stable” gets abused in medicine. Stable does not mean harmless. Stable means that the patient’s physiology is not currently failing. A patient can be stable and still require a hospital, and this patient certainly did. He needed formal laboratory testing, serial troponins, continued rhythm monitoring, assessment for evolving myocardial ischemia, and observation until the effects of the intoxicants diminished. Whether the atrial fibrillation would spontaneously convert, persist, or require additional treatment was something best determined with hospital resources.

But the patient did not require me for transport.

That was equally important.

Transport Decision and Clinical Destination

Medic 1 transported the patient to the emergency department for further evaluation of stimulant-associated chest discomfort and new atrial fibrillation with rapid ventricular response. Kevin and Mike were entirely capable of managing the transport, continuing rhythm and hemodynamic monitoring, repeating ECGs if symptoms changed, and escalating treatment if he became unstable.

I did not accompany them.

There was no physician-level intervention required at that point. Had he developed hypotension, worsening ischemic pain, malignant dysrhythmia, severe agitation, hyperthermia, pulmonary edema, altered mental status, or another manifestation of significant toxicologic cardiovascular toxicity, that decision would have changed immediately.

But he didn’t.

Kevin and Mike had this.

And they had done exactly what I expect from experienced paramedics.

They didn’t get distracted by the location.

They didn’t get distracted by the alcohol.

They didn’t decide that because the patient had used cocaine, his chest pain was automatically “just drugs.”

They recognized an abnormal rhythm, evaluated the patient for instability, considered dangerous alternative diagnoses, treated the clinically relevant problem, and transported him for definitive evaluation.

The police remained nearby throughout the encounter. They were there because the bus stop tends to generate enough calls that everybody has learned not to assume anything about what will happen next. In this case, however, there was nothing for them to do medically or operationally. They stood by, watched the situation unfold, and eventually the tension that sometimes accompanies the bus stop simply dissipated.

Nobody fought.

Nobody ran.

Nobody tried to climb onto the ambulance roof.

By bus-stop standards, it was practically a quiet afternoon.

After Medic 1 departed, I returned to the Fly Car. The engine crew had already begun returning to quarters. The police remained for a little while longer, then eventually cleared.

I drove back toward the station thinking about the oddity of EMS. A dispatch had given us “35-year-old male, chest pain,” which could have meant myocardial infarction, pulmonary embolism, aortic catastrophe, pneumothorax, myocarditis, pericarditis, dysrhythmia, or something considerably less dangerous. Instead, the patient turned out to have a toxicologic cardiovascular problem associated with alcohol and cocaine use.

That is why we don’t treat dispatch information.

We treat patients.

The bus stop itself remained behind us, looking completely ordinary again. That is perhaps the strangest thing about places like that. Ten minutes after an ambulance leaves, it is just a bus stop again. A bench. A shelter. A schedule. A patch of pavement beside the road.

Then the bus comes.

Someone gets off.

And occasionally, the radio starts talking about it again.

When I pulled back into the station, Kevin’s chair was still outside. Mike’s was beside it. The coffee pot was where we had left it, although the coffee had reached the stage where calling it coffee was becoming increasingly charitable.

I sat down.

Kevin eventually returned from the hospital and gave us the short version of the patient’s course. Nothing dramatic had happened during transport. His rate remained controlled enough, his pressure stayed normal, and he continued to feel better.

Another call handled.

Another patient transported.

Another afternoon in rural EMS.

And once again, the Fly Car had carried an absurd amount of medicine that we hadn’t needed.

Which, honestly, is exactly how I like it.

Because the goal of all that equipment, all those medications, all those ultrasound probes, all that blood, all those airway devices and specialized trauma capabilities, is not to use them.

The goal is to have them when somebody actually needs them.

On this particular afternoon, nobody did.

A young man arrived at the bus stop with chest discomfort and a heart rhythm that had gone sideways after a chemically complicated afternoon. He received competent assessment, appropriate monitoring, careful treatment, and transport to definitive care.

And I got to go back to my lawn chair.

Which, given how the day had started, was probably the most appropriate advanced intervention available

The First Day of High School and the Longest Seizure: A Physician-Paramedic Call

There are days at the fire station that begin with absolutely no indication of what is coming. This was one of those days. Late August had settled over the town with the peculiar combination of warmth and approaching autumn that makes New England mornings and afternoons feel as though they belong to two different seasons. The bay doors were open, the apparatus was ready, and Kevin, Mike, and I were sitting outside in lawn chairs with coffee, talking about what we were going to eat when we eventually escaped for the evening. We had reached the point in the conversation where dinner had become a surprisingly serious logistical problem, despite the fact that none of us had any idea what time we would actually get home. Kevin was advocating for something uncomplicated, Mike had a completely different opinion delivered with his usual dry sarcasm, and I was trying to determine whether there was any possibility of getting through the afternoon without somebody calling us to ruin our plans.

The answer, as usual, was no.

I serve as both the EMS Medical Director and Commander of EMS for our rural Fire/EMS department, but when I am working the Fly Car I am also simply another clinician on the response. I happen to be a trauma and critical care surgeon who is also a licensed paramedic, which gives me a somewhat unusual perspective on prehospital medicine. The other volunteers know that when I arrive, I am not there to stand over them and micromanage their every decision. Kevin and Mike are experienced paramedics who can assess, treat, reassess, and transport patients without needing a physician hovering over them. My role is to bring another layer of clinical expertise when the patient’s physiology warrants it, particularly when a case begins crossing into the territory where advanced airway management, complex resuscitation, unusual medication decisions, or physician-level clinical judgment may become necessary.

The Fly Car itself is absurdly capable. It is essentially a climate-controlled resuscitation bay on four wheels, engineered to make emergency physicians jealous and hospital administrators nervous. Temperature-controlled low-titer O-positive whole blood and plasma sit alongside rapid fluid-warming capability for hemorrhagic shock. Wireless ultrasound probes communicate with rugged tablets, point-of-care analyzers can rapidly provide glucose, electrolytes, and lactate, and the medication inventory extends well beyond what most conventional ambulances carry. Advanced video laryngoscopy, transport ventilation, mechanical CPR, sophisticated vascular-access equipment, and specialized trauma capabilities are available when the clinical situation actually requires them. There are even capabilities for extraordinarily uncommon procedures such as REBOA in carefully selected catastrophic hemorrhage, along with surgical airway and other rescue equipment.

But none of that matters if the patient does not need it.

That distinction is something I learned very early in trauma surgery. The presence of a piece of equipment does not constitute an indication to use it. The best clinician is not necessarily the one who performs the most procedures. It is the one who understands which intervention will actually alter the patient’s trajectory and which intervention merely satisfies the clinician’s desire to do something.

At 12:10 p.m., the tones dropped.

“Attention Station 1: Medic 1, Engine 1 and Fly Car: Please respond to the high school for a 13-year-old female with an active seizure.”

Everything about the atmosphere changed.

Dinner disappeared from the conversation.

I grabbed my equipment and headed for the Fly Car while Kevin and Mike moved toward Medic 1. Kevin was driving. Engine 1 was already ahead of us, lights flashing, siren running, horn and Q siren making their familiar mechanical announcement as they moved toward the school.

And then I remembered something else.

It was the first day of school.

For a thirteen-year-old, that means something.

It is not simply another day on the calendar. It is the first day of a new academic year, new teachers, new schedules, new classrooms, and, for this particular girl, the first day of high school. There is a strange optimism associated with that day. Kids are nervous about lockers and schedules and whether they will find the right classroom. Parents are taking photographs. Teachers are trying to establish order before the inevitable erosion of order begins. Somebody is probably already complaining about homework.

Instead, this young girl was having a prolonged seizure.

As we approached the school, the information coming over the radio became increasingly concerning. Staff reported that the patient had collapsed during the school day and developed generalized convulsive activity. They had initiated emergency procedures, cleared the area around her, and called 911. The seizure had continued despite initial school-based first aid measures. The exact duration was still being established, but the important point was that she had not returned to baseline and remained actively convulsing.

That immediately raised the possibility of status epilepticus.

Status epilepticus is not simply a seizure that happens to last a long time. It represents a failure of the brain to terminate abnormal electrical activity, and prolonged convulsive activity becomes progressively more dangerous. Continuous muscular contraction produces enormous metabolic demand, increased lactate generation, hyperthermia, catecholamine release, acidosis, hypoxemia from impaired ventilation, and eventually cellular injury. The longer the seizure continues, the more difficult it can become to terminate.

This was therefore not a case where we could arrive, observe, and see what happened.

We needed to stop it.

We arrived at the school and were directed toward a hallway near one of the classrooms. There were teachers and administrators nearby, but the immediate area around the patient had been cleared. She was on the floor, actively convulsing, with generalized tonic-clonic movements. Her jaw was clenched, her extremities were rhythmically contracting, and she was not responding to voice.

There is a particular quality to a prolonged generalized seizure that experienced clinicians recognize immediately. It is not the same as a brief seizure followed by recovery. The patient remains physiologically trapped in the event. The muscles continue consuming oxygen and generating carbon dioxide and lactate, while the brain continues firing abnormally.

We moved quickly.

Primary Survey

• Airway: Not reliably protected during active convulsive activity. No obvious foreign body or major airway obstruction.
• Breathing: Ineffective and irregular during portions of the convulsion, with transient desaturation.
• Circulation: Tachycardic but palpable central and peripheral pulses; no evidence of hemorrhagic shock.
• Disability: Active generalized convulsive seizure with no meaningful response to verbal stimulus.
• Exposure: No major traumatic injury identified. Minor facial and extremity abrasions consistent with the collapse.

Kevin and Mike immediately began establishing monitoring and vascular access while I focused on the airway, seizure characteristics, and potential causes. The school nurse provided the information she had available. There was reportedly a history of seizures, although the staff were uncertain about the details, and there was no indication that this was simply a known brief seizure pattern for her. Her medications and compliance history would require clarification from family.

The patient was not merely having a seizure.

She was having a seizure that was refusing to stop.

Vital Signs

• Heart rate: 146 beats/min
• Blood pressure: 148/88 mmHg
• Respiratory rate: Unable to accurately quantify during active convulsions
• SpO₂: 89% initially, improving with airway positioning and supplemental oxygen
• Temperature: 99.1°F initially
• Blood glucose: 104 mg/dL
• ETCO₂: Initially difficult to obtain reliably during violent movement; subsequently approximately 31 mmHg after partial seizure control

The glucose immediately excluded one of the most important rapidly reversible causes of seizure. There was no reason to administer dextrose. Hypoglycemia can cause neuronal dysfunction and seizures, but a glucose of 104 mg/dL made that explanation essentially irrelevant in this case.

The first priority was termination of the seizure.

Interventions

• Patient moved to a clear floor area with spinal precautions used only as clinically indicated by the mechanism of collapse rather than automatically.
• Continuous ECG, pulse oximetry, noninvasive blood pressure, and ETCO₂ monitoring established.
• High-flow supplemental oxygen initially applied because of transient hypoxemia during active convulsions.
• Suction immediately available.
• Two peripheral IV lines established.
• Blood glucose obtained immediately.
• Airway equipment prepared for escalation.
• Seizure duration continuously tracked.
• Continuous neurologic and respiratory reassessment performed.
• Temperature monitored because prolonged convulsive activity can produce clinically important hyperthermia.
• POCUS and point-of-care laboratory testing performed once movement was sufficiently controlled to obtain useful measurements.

The initial benzodiazepine was administered according to our EMS seizure protocol.

Medications

• Lorazepam 2 mg IV administered for ongoing generalized convulsive seizure activity.
• Because convulsions continued, lorazepam 2 mg IV was repeated, bringing the total administered dose to 4 mg.
• Because the seizure persisted despite adequate benzodiazepine therapy, levetiracetam 60 mg/kg IV, with a protocol-defined maximum dose, was initiated as second-line antiseizure therapy.
• No dextrose administered because blood glucose was 104 mg/dL.
• No calcium or sodium bicarbonate administered because there was no evidence of a corresponding metabolic indication.
• No empiric antibiotic therapy initially because there was no fever, meningismus, or other immediate evidence establishing CNS infection.
• No opioid medication administered because analgesia was not the clinical priority during active status epilepticus.

The benzodiazepine initially reduced the intensity of the convulsions but did not completely terminate them.

That is the point where the clinical environment becomes more complicated.

Persistent seizure activity after an appropriate benzodiazepine dose is concerning because additional benzodiazepine may be necessary, but escalating doses increase the risk of respiratory depression. The solution is not to choose between treating the seizure and protecting the airway. The two problems have to be managed simultaneously.

Kevin was working the vascular access and medication side. Mike was managing monitoring and airway equipment. I was assessing the patient’s respiratory mechanics and neurologic response while we prepared the next medication.

This was not three people doing three unrelated jobs.

It was one resuscitation.

The levetiracetam infusion was started. For a brief period the motor activity decreased substantially, then intensified again.

Her oxygen saturation began to fall.

The seizure had now become a respiratory problem as well.

Reassessment

• HR: 158 beats/min during ongoing convulsions
• BP: 156/92 mmHg
• SpO₂: Fell to 86% despite supplemental oxygen during recurrent convulsive activity
• ETCO₂: Approximately 29-31 mmHg when waveform obtainable
• Mental status: No meaningful response because of ongoing seizure activity
• Airway: Inadequate protective reflexes during recurrent generalized convulsions
• Skin: Warm and increasingly diaphoretic
• Temperature: 100.4°F on repeat measurement

We repositioned her, suctioned the airway, and used assisted ventilation as necessary. The goal was not to rush immediately into intubation simply because the patient was seizing. Intubation is an intervention, not a trophy. If the seizure could be terminated pharmacologically and spontaneous ventilation restored, that would be preferable. But if the patient developed refractory status epilepticus, persistent hypoxemia, or failure to protect the airway, advanced airway management would become necessary.

This was where having a physician-paramedic on scene became clinically useful.

I could look at the entire picture rather than simply the individual numbers. She was young, her blood pressure was preserved, her oxygenation was intermittently compromised by the seizure, and she had already received appropriate first- and second-line antiseizure therapy. The question was whether we were approaching the threshold at which airway control would become necessary.

Before that threshold was reached, the seizure finally broke.

The change was obvious.

The rhythmic movements stopped. Her jaw relaxed. Her respiratory effort became more coordinated. Her oxygen saturation began climbing. The tachycardia remained, but the rate began to fall. She was deeply postictal, as expected.

We did not declare victory.

A patient who has just stopped convulsing after prolonged seizure activity remains critically ill until the trajectory is clearly favorable.

Diagnostics

Point-of-care testing was obtained after seizure control.

• Blood glucose: 104 mg/dL.
• Sodium: 138 mEq/L.
• Potassium: 4.2 mEq/L.
• Ionized calcium: 1.20 mmol/L.
• Creatinine: 0.6 mg/dL.
• Lactate: 6.1 mmol/L.
• ETCO₂: 35 mmHg after recovery of effective spontaneous ventilation.
• POCUS cardiac assessment: Grossly preserved cardiac contractility without pericardial effusion.
• POCUS pulmonary assessment: Bilateral lung sliding present without evidence of pneumothorax; no significant diffuse interstitial pattern.
• Focused trauma examination: No evidence of significant traumatic injury from the collapse.

The lactate was elevated, but the context mattered enormously. A lactate of 6.1 mmol/L immediately after prolonged generalized convulsive activity is entirely compatible with the physiology of the seizure itself. Skeletal muscle activity and catecholamine-driven glycolysis can produce substantial lactate without systemic septic shock or tissue hypoperfusion. It would have been clinically absurd to look at that number in isolation and diagnose sepsis.

The same principle applied to her mild temperature elevation. Prolonged muscular activity generates heat. A temperature of 100.4°F immediately following a significant seizure does not automatically represent infection. Again, context matters.

Differential Diagnosis

1. Status epilepticus: Most likely, given prolonged generalized convulsive activity with failure to return to baseline and incomplete response to initial benzodiazepine therapy.
2. Breakthrough seizure from known epilepsy: Possible if medication nonadherence, illness, sleep deprivation, or another precipitant was identified.
3. Metabolic seizure: Considered, but initial glucose, sodium, potassium, and calcium were reassuring.
4. Toxicologic or medication-related seizure: Considered depending on medication history and possible exposure.
5. Intracranial structural pathology: Important because prolonged or new changes in seizure pattern can reflect hemorrhage, mass lesion, vascular malformation, or other intracranial disease.
6. CNS infection: Considered but less likely in the absence of fever or meningismus at presentation.
7. Psychogenic nonepileptic seizure: Considered in the broad differential of seizure-like activity but substantially less likely given the clinical characteristics and physiologic consequences.
8. Convulsive syncope: Unlikely given the prolonged generalized motor activity and prolonged postictal state.

Once she had stopped seizing, the history became our next diagnostic tool. School staff provided what they knew, and we contacted her family for additional information. The patient had a known seizure disorder, but there had been some uncertainty surrounding her medication adherence and recent sleep. The first day of school had meant an unusually early morning and a disrupted schedule. That information was potentially relevant, but it did not change the immediate transport decision.

A prolonged breakthrough seizure in a 13-year-old is not a “she’s fine now” event.

It is a hospital event.

She needed definitive laboratory testing, medication-level assessment if applicable, comprehensive neurologic evaluation, and consideration of neuroimaging or EEG depending on her subsequent course.

She also needed observation because a prolonged seizure increases the risk of recurrence.

The young girl was now awake enough to make eye contact but remained profoundly tired and confused. She was able to answer simple questions. Her oxygenation normalized. Her heart rate came down into the 120s and continued improving.

Reassessment After Seizure Termination

• HR: 118 beats/min and declining.
• BP: 136/80 mmHg.
• RR: 18/min with adequate spontaneous ventilation.
• SpO₂: 98% on supplemental oxygen, subsequently maintaining 97% on room air.
• ETCO₂: 35 mmHg.
• Mental status: Postictal but progressively more responsive.
• Pupils: Equal and reactive.
• Motor examination: Symmetric movement of all extremities.
• Airway: Self-maintained with adequate protective reflexes.
• No recurrent convulsive activity during serial reassessment.

The decision to transport was straightforward.

She needed the hospital.

The question was whether I needed to accompany her.

In this case, yes.

This was different from the 20-year-old with uncomplicated abdominal pain or the stable patient whose condition remained comfortably within standard paramedic practice. This patient had experienced prolonged generalized convulsive activity requiring multiple antiseizure interventions, transient respiratory compromise, and escalation beyond initial benzodiazepine therapy. There remained a meaningful possibility of recurrent status epilepticus and advanced airway intervention.

That was precisely the kind of patient for whom having a physician-paramedic in the ambulance could add meaningful value.

Transport Decision and Clinical Destination

• Emergent transport to a pediatric-capable hospital with emergency neurologic evaluation and pediatric critical-care resources.
• Physician-paramedic accompanied the patient because of prolonged seizure activity, multiple antiseizure medications, transient hypoxemia, and potential need for advanced airway management.
• Continuous ECG, pulse oximetry, blood pressure, and ETCO₂ monitoring maintained during transport.
• Airway equipment and additional antiseizure medication immediately available.
• Serial neurologic examinations performed during transport.
• Receiving facility notified of prolonged seizure activity and medications administered before arrival.

The ride to the hospital was much quieter than the trip there.

The girl was awake enough to understand where she was but still confused about what had happened. She asked whether she had missed lunch.

Then she asked whether she was going to miss the rest of school.

That question bothered me more than it probably should have.

She was thirteen.

It was her first day of high school.

While other kids were worrying about finding classrooms, meeting teachers, figuring out their schedules, and whether they would make friends, she was lying on a stretcher after a prolonged generalized seizure and wondering whether she was going to miss the school day.

I told her that school could wait.

Her brain could not.

That is one of the privileges of being a physician-paramedic. You occasionally get to see a patient’s illness from two perspectives simultaneously. The paramedic in me was concerned about airway protection, seizure recurrence, medication effects, oxygenation, and transport. The physician in me was thinking about why this seizure happened, whether there was a structural lesion, whether medication levels were appropriate, whether there was an underlying infection or metabolic disturbance, and what the neurologic workup would ultimately show.

But the human being in me was simply thinking that this was a terrible way to begin high school.

At the emergency department, we transferred her to the receiving team with a detailed handoff. We described the witnessed generalized convulsive activity, the prolonged duration, the failure of the initial seizure to terminate promptly, the total benzodiazepine dose, the subsequent levetiracetam administration, the transient hypoxemia, the point-of-care glucose and electrolyte results, the elevated postictal lactate, the subsequent return of spontaneous ventilation, and the trajectory of her neurologic recovery.

The emergency team took over.

We stepped back.

That is where prehospital medicine ends and hospital medicine begins.

The girl was alive, ventilating spontaneously, no longer seizing, and headed toward definitive evaluation. We had accomplished what we could accomplish in the field. We had recognized the severity of the seizure, terminated the abnormal electrical activity, protected her airway, monitored the consequences of the treatment, ruled out several immediately reversible metabolic causes, and delivered her to the appropriate level of care.

But the thing I kept thinking about as we walked back outside was that this had been her first day of high school.

There is something sobering about seeing a child in a situation like that. In trauma, we often become intensely focused on the physiology because the physiology is what determines survival. Blood pressure, oxygenation, ventilation, cerebral perfusion, hemorrhage, intracranial pressure, cardiac output, lactate, temperature, and all the other variables that populate our clinical world are necessary because they tell us what the body is doing.

But patients are not physiology.

They are people.

This particular patient was a thirteen-year-old girl who had probably spent the morning worrying about school, friends, teachers, and whatever ordinary anxieties accompany adolescence. Her parents probably took photographs that morning. She probably had a backpack. She probably had plans for the afternoon.

Instead, her first day of high school ended in an ambulance.

Medicine has a way of intruding upon ordinary life without asking permission.

We eventually returned to the station. Engine 1 was back in quarters, the Fly Car was ready, and Medic 1 would be cleaned, restocked, and placed back in service. The station had returned to its usual rhythm. Somewhere outside the bay, the late-August afternoon continued as though nothing had happened.

Kevin and Mike had done excellent work. They had recognized the severity of the seizure immediately, established access, administered appropriate medications, managed the airway, monitored the patient closely, and communicated effectively throughout the entire encounter. My presence added another layer because this particular seizure had crossed the threshold where physician-level oversight and advanced airway capability were genuinely useful.

That is what I want our EMS system to be.

Not a system where the physician arrives and takes over.

Not a system where paramedics wait for the doctor to tell them what to do.

A system where experienced clinicians recognize what they are looking at, work together without ego, use the equipment they actually need, and escalate care when the physiology demands it.

The Fly Car was once again sitting quietly in the apparatus bay, its whole blood, ultrasound, laboratory equipment, airway gear, ventilator, medications, and specialized trauma equipment waiting for the next patient.

Most of it had not been used.

That was perfectly fine.

The most important equipment we brought to the school that day was a functioning brain, experienced hands, a few appropriate medications, an airway bag, a monitor, and three clinicians who understood what the patient needed.

The rest could wait.

The next morning, this young woman would hopefully wake up in a hospital bed, with neurologists asking questions and nurses checking medications, and perhaps somebody would eventually tell her that missing the first day of high school was not nearly as catastrophic as it had seemed from the back of an ambulance.

And that, in its own way, is one of the reasons I keep volunteering.

Because sometimes being a physician-paramedic means performing advanced medicine in the field.

Sometimes it means knowing exactly when to use the equipment that makes a Fly Car look like a mobile ICU.

And sometimes it simply means being there when a thirteen-year-old girl has had a terrible first day and needs somebody competent beside her while the rest of the world waits.