Wilderness medicine at high altitude: recent developments in the field

Area of Science:

• Altitude Medicine
• Travel Health
• Physiology

Background:

• Increasing popularity of high-altitude travel necessitates improved strategies for preventing and diagnosing altitude illnesses.
• Current diagnostic tools, like the Lake Louise Score for acute mountain sickness (AMS), face scrutiny regarding their validity and the monolithic view of AMS.
• Emerging biomarkers and evolving understanding of exercise's role highlight the need for updated clinical guidance.

Purpose of the Study:

• To summarize recent advancements in the prevention and diagnosis of high-altitude illnesses relevant to medical practitioners advising travelers.
• To critically evaluate current diagnostic criteria and explore novel biomarkers for altitude illness.
• To review established and potential pharmacological interventions and the impact of exercise and preacclimatization.

Main Methods:

• Literature review of recent studies on high-altitude illness, diagnostics, biomarkers, and therapeutics.
• Analysis of evidence questioning the Lake Louise Score and the concept of acute mountain sickness as a single entity.
• Examination of research on biomarkers (e.g., brain natriuretic peptide), drug treatments (acetazolamide, nifedipine, dexamethasone, nitrates, iron), exercise intensity, and preacclimatization protocols.

Main Results:

• The validity of the Lake Louise Score for diagnosing acute mountain sickness is increasingly questioned.
• Biomarkers like brain natriuretic peptide show potential for monitoring altitude illness development.
• Established treatments include acetazolamide, nifedipine, and dexamethasone; potential preventative drugs include nitrates and iron supplements. Exercise intensity, not just exercise, influences altitude illness.
• An optimal preacclimatization protocol remains undetermined despite proven benefits.

Conclusions:

• Current diagnostic and treatment strategies for altitude illness require re-evaluation based on emerging evidence.
• Further research into novel biomarkers and personalized preacclimatization protocols is crucial for optimizing traveler health.
• Practitioners need updated guidance to effectively manage the risks associated with high-altitude travel.