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[Acute high-altitude illnesses - Definition, Prophylaxis, Therapy].

Dinah Hertig1,2, Mona Lichtblau1,2, Michael Furian1

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Summary

Preventing and treating acute altitude illnesses like Acute Mountain Sickness (AMS), High Altitude Cerebral Edema (HACE), and High Altitude Pulmonary Edema (HAPE) is crucial for unacclimatized individuals ascending above 2,500 meters. Early recognition and prompt intervention significantly improve outcomes.

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AMSHACEHAPEaltitude medicine

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Area of Science:

  • Altitude Medicine
  • Hypobaric Physiology
  • Travel Health

Background:

  • Acute altitude illnesses, including Acute Mountain Sickness (AMS), High Altitude Cerebral Edema (HACE), and High Altitude Pulmonary Edema (HAPE), affect unacclimatized individuals above 2,500 meters.
  • These conditions stem from hypobaric hypoxia, with risk influenced by ascent rate, destination altitude, and individual factors.
  • AMS is common, presenting with headache and nausea, while HACE and HAPE are severe, potentially fatal complications.

Purpose of the Study:

  • To outline the clinical presentations of AMS, HACE, and HAPE.
  • To describe the pathophysiology and risk factors associated with these altitude-related illnesses.
  • To emphasize the importance of prevention, early recognition, and prompt treatment strategies.

Main Methods:

  • Review of clinical manifestations and pathophysiological mechanisms of acute altitude illnesses.
  • Analysis of risk factors including ascent profile and individual susceptibility.
  • Summary of current prevention and treatment guidelines for AMS, HACE, and HAPE.

Main Results:

  • AMS presents with headache, dizziness, and fatigue; HACE involves neurological deficits; HAPE causes dyspnea and cough.
  • Pathophysiology involves vasogenic edema (HACE) and hypoxic pulmonary vasoconstriction (HAPE).
  • Prevention strategies include gradual ascent and acclimatization; treatment involves descent, oxygen, and medications like acetazolamide, dexamethasone, or nifedipine.

Conclusions:

  • Acute altitude illnesses are serious conditions requiring vigilant management.
  • Effective prevention and timely treatment, including descent and medical support, are critical for survival.
  • Understanding risk factors and early symptom recognition are paramount for managing these potentially life-threatening conditions.