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Platelets and High-Altitude Exposure: A Meta-Analysis.

Yuliang Wang1, Xuewen Huang1, Weibo Yang1

  • 1Department of High Altitude Disease, Xizang Military General Hospital, Xizang Province, Lhasa City, China.

High Altitude Medicine & Biology
|February 23, 2022
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Summary

Chronic high-altitude hypoxia significantly reduces platelet count and increases mean platelet volume. Acute exposure, however, shows no significant impact on platelet indices. This meta-analysis clarifies the effects of altitude on platelet function.

Keywords:
acute high-altitude diseasechronic mountain sicknesshigh altitudehypoxiaplatelet

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Area of Science:

  • Physiology
  • Environmental Medicine
  • Hematology

Background:

  • High-altitude environments present unique physiological challenges, including hypoxia.
  • The influence of high-altitude hypoxia on platelet count and indices remains a subject of debate.
  • Platelets play crucial roles in hemostasis, inflammation, and immune responses.

Purpose of the Study:

  • To quantitatively assess the impact of high-altitude exposure on platelet count (PC) and platelet indices.
  • To differentiate the effects of acute versus chronic high-altitude hypoxia on platelet parameters.
  • To analyze platelet changes in individuals with chronic mountain sickness.

Main Methods:

  • Systematic literature search across multiple electronic databases (PubMed, Embase, Web of Science, etc.).
  • Inclusion of 32 studies reporting associations between platelet parameters (PC, PDW, MPV, PCT) and high-altitude exposure.
  • Meta-analysis using random-effects models to estimate standard mean differences (SMD) and confidence intervals (CI). Statistical analysis performed using Stata 15.3.

Main Results:

  • Acute high-altitude hypoxia (1-14 days) showed no significant effect on platelet count or indices.
  • Chronic high-altitude hypoxia (≥1 month) was associated with a significant decrease in platelet count (SMD = -0.34) and an increase in mean platelet volume (MPV) (SMD = 1.55).
  • Platelet count was significantly lower in individuals with chronic mountain sickness compared to healthy altitude controls (SMD = -1.82). The effects were more pronounced with longer exposure durations (≥1 year).

Conclusions:

  • Chronic exposure to high-altitude hypoxia is linked to a reduction in platelet count and an elevation in mean platelet volume.
  • Acute exposure to high altitude does not appear to significantly alter platelet parameters.
  • These findings highlight the differential impact of altitude exposure duration on hematological parameters, specifically platelets.