Acute mountain sickness: pathophysiology, prevention, and treatment

Area of Science:

• Altitude Medicine
• Environmental Physiology
• Hypobaric Physiology

Background:

• Reduced barometric pressure at altitude lowers oxygen partial pressure, creating a hypoxic environment.
• Hypoxic stress can overwhelm acclimatization, leading to a spectrum of altitude illnesses.
• Acute altitude illnesses include acute mountain sickness (AMS), high-altitude cerebral edema (HACE), and high-altitude pulmonary edema (HAPE).

Purpose of the Study:

• To describe the clinical features and pathophysiology of AMS and HACE.
• To review current prevention and treatment strategies for acute altitude illnesses.
• To explore the evidence base for interventions against altitude-related disorders.

Main Methods:

• Review of existing literature on altitude illness pathophysiology, prevention, and treatment.
• Clinical description of AMS and HACE based on established medical knowledge.
• Analysis of contemporary practices and evidence for interventions.

Main Results:

• Rapid ascent above 3000 m without acclimatization is a common precipitant of acute altitude illness.
• Individual susceptibility to altitude syndromes is variable but generally reproducible.
• Effective prevention involves gradual ascent; immediate treatment for severe illness includes oxygen and descent.

Conclusions:

• Altitude illnesses result from inadequate acclimatization to reduced oxygen availability at higher elevations.
• Prevention through slow ascent is ideal, though not always feasible.
• Prompt recognition and management, including descent, are crucial for severe altitude-related conditions.