Background: In flight medical events (IMEs) and aircrew health issues pose distinctive
challenges in commercial aviation. We aimed to synthesize contemporary evidence on
IME epidemiology, onboard interventions and outcomes, and aircrew physiology and
fitness with implications for safety policy. Methods: PRISMA aligned review of
MEDLINE, Embase, Web of Science, Scopus, and CENTRAL plus regulator sources to
2025. Two reviewers screened and extracted data. SWiM guided structured narrative
synthesis reporting. Results: Fifteen studies met criteria: IMEs, onboard interventions (n
6) and aircrew physiology, performance (n 9). IME incidence ranged from one per 604
flights to 16 per million passengers; syncope predominated. Diversion occurred in 7%,
admission in 9%, and death in 0.3%. Automated external defibrillators enabled accurate
rhythm decisions and 40% survival for ventricular fibrillation. First aid kits were opened
in 15% of events; oxygen and telemedical support were common. Among pilots, annual
medical incapacitation was 0.25%, increasing with age; psychiatric diagnoses had the
longest suspensions. Fatigue exposure covered 10% of flying hours at elevated modeled
risk, and about one quarter of duties followed less than 6 hours of sleep. Hypoxia
experiments showed delayed symptom recognition and identified EEG, oxygen
saturation, and heart rate markers linked to performance. Conclusions: Most IMEs are
nonfatal and manageable on board with trained crews, standardized kits, AEDs, and
telemedicine. Critical arrests benefit from rapid defibrillation. Aircrew safety improves
with fatigue mitigation, hypoxia focused training, physiologic monitoring, and age
aware fitness oversight.
Keywords: In flight medical events; aviation medicine; aircrew health; pilot
incapacitation; hypoxia; telemedicine; PRISMA; systematic review
