Flight Stressors: Pathophysiological Principles Guiding Safe Fixed-Wing Aeromedical Transport of Critically Ill...

Area of Science:

• Aerospace Medicine
• Critical Care Medicine
• Physiology

Background:

• International travel poses risks for patients needing aeromedical evacuation due to medical emergencies.
• While specialized teams manage critically ill patients, general medics also handle those requiring air transfer post-stabilization.
• High-altitude flight presents unique environmental stressors that can negatively impact patient health.

Purpose of the Study:

• To identify and explain in-flight factors that can adversely affect patient well-being during aeromedical evacuation.
• To provide essential information for all medical personnel managing patients during air transport.
• To enhance the safety of aeromedical evacuations by increasing awareness of flight-related risks.

Main Methods:

• A comprehensive literature search was performed on PubMed and Google Scholar up to March 2025.
• A multimethod approach was employed to identify relevant studies for this narrative review.
• Basic physics principles were applied to clinical scenarios to understand physiological effects at altitude.

Main Results:

• Flight stressors include hypobaric environment, thermal stress, altered gravity, vibration, and noise.
• In-flight hypoxia is a primary risk, alongside increased thromboembolic events and gas expansion/embolism.
• Pneumatically operated medical devices may malfunction due to pressure changes, and trapped gas can cause serious complications.

Conclusions:

• Physicians must be aware of and anticipate in-flight stressors for safe aeromedical evacuation.
• Understanding the interplay of pressure, volume, and temperature is vital for managing patients in flight.
• Proactive management of flight-related risks is essential for improving outcomes in aeromedical transport.