In this episode of Critical Levels, Zach sits down with Dr. Anna-Maria Carvalho, a Royal College–certified emergency physician with a subspecialty in aviation medicine, to unpack what really happens when someone asks, "Is there a medical professional on board?"
From the physiology of flying at 36,000 feet to the realities of managing cardiac arrest in a cramped aircraft cabin, this episode tackles the fears, logistics, and practical considerations of in-flight medical emergencies—especially for paramedics, nurses, and physicians who may be called upon to help.
🫁 The Physiology of Flight
Why cabin altitude means we're all mildly hypoxic (normal sats ~92–93%)
How hypoxia increases heart rate, blood pressure, and sympathetic tone
Why alcohol hits harder in the air
Why tomato juice tastes better at altitude
The risk of DVTs and who's most vulnerable
Barotrauma, ear pain, and when a perforated eardrum can occur
🚨 In-Flight Medical Emergencies
Incidence: ~1 in 600 flights
Most common categories:
Neurologic
Cardiac
Respiratory
Gastrointestinal
The realities of flying with chronic disease
Why more emergencies are happening as more people travel
🧰 What's in the Emergency Medical Kit?
AED (separate from the medical kit)
Oxygen & Ambu bag
Oral airways (intubation equipment varies by airline)
IV supplies (limited fluids, but enough for medication administration)
Medications: epinephrine, steroids, bronchodilators, benzodiazepines, antipsychotics, glucose agents, and more
BP cuff (palpated pressures only—too noisy to auscultate!)
Pulse oximeter (remember: 93% can be normal)
📡 Ground-Based Medical Support
Most airlines consult 24/7 emergency physicians on the ground
Volunteers don't make diversion decisions—the captain does
Diversions involve significant operational and logistical consequences
In-flight volunteers are there to assess, stabilize, and communicate
🫀 Cardiac Arrest at 36,000 Feet
Move to a bulkhead/galley if possible
Call for additional medical volunteers
Early AED use
CPR until ROSC, exhaustion, or medical futility
Diversion decisions are collaborative and situational
⚖️ The Legal Question
Good Samaritan protections apply
Act within scope
No gross negligence or willful misconduct
No one has ever been successfully sued for assisting with an in-flight medical emergency
You are not responsible for diversion decisions
🕊️ When Death Occurs In Flight
Resuscitation attempts may cease when appropriate
Diversion is not automatic
Flight crew are trained to manage these situations professionally and discreetly
You already have the skills.
The environment is different—but the fundamentals are the same.
Recognizing sick vs. not sick is incredibly valuable.
Most in-flight volunteer diagnoses are ultimately confirmed in hospital.
About 60% of passengers improve with basic stabilization.
You are protected when acting in good faith and within scope.
If you've ever hesitated to answer that overhead call, this episode may change your perspective.
