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Altitude hypoxia and hypoxemia: pathogenesis and management.

Chunmei Cai1, Guohua Ni2, Lei Chen2

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Summary

High altitude illnesses like AMS, HACE, and HAPE result from poor acclimatization to hypobaric hypoxia. This review explores their mechanisms, risk factors, and treatments, including traditional Tibetan medicines.

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Area of Science:

  • Environmental Physiology
  • Altitude Medicine
  • Pathophysiology

Background:

  • High altitudes (>2500m) affect 80 million residents and 1 million visitors annually.
  • Hypobaric hypoxia at altitude triggers physiological responses, but inadequate or excessive adaptation causes malacclimatization and altitude illnesses.
  • Altitude illnesses range from acute (AMS, HACE, HAPE) to chronic (CMS, HAPH), stemming from acclimatization issues.

Purpose of the Study:

  • To review current knowledge on clinical manifestations, epidemiology, and risk factors of high-altitude diseases.
  • To systematically discuss recent pathophysiological mechanisms, focusing on genetic susceptibility and chronic altitude illnesses (CMS, HAPH).
  • To provide a comprehensive overview of prevention and treatment strategies, highlighting natural and traditional Tibetan medicines.

Main Methods:

  • Literature review of clinical manifestations, epidemiology, risk factors, and pathophysiology.
  • Systematic discussion of recent pathophysiological mechanisms, including genetic factors.
  • Overview of current prevention and treatment strategies, with emphasis on natural medicines.

Main Results:

  • High-altitude illnesses are categorized as acute (AMS, HACE, HAPE) or chronic (CMS, HAPH) based on acclimatization adequacy.
  • Pathophysiological mechanisms, especially for chronic conditions and genetic susceptibility, are under ongoing investigation.
  • Natural medicines, particularly traditional Tibetan remedies, show promise in prevention and treatment.

Conclusions:

  • Mechanisms underlying high-altitude illnesses are not fully understood, and management options remain limited.
  • Further research is needed to elucidate pathogenic mechanisms and improve prevention and treatment strategies.
  • Exploring genetic susceptibility and novel therapeutic approaches, including traditional medicines, is crucial for advancing altitude illness management.