Ginkgo biloba does--and does not--prevent acute mountain sickness

Wilderness Environ Med. Spring 2009;20(1):66-71. doi: 10.1580/08-WEME-BR-247.1.

Abstract

Objective: To determine the efficacy of 2 different sources of Ginkgo biloba extract (GBE) in reducing the incidence and severity of acute mountain sickness (AMS) following rapid ascent to high altitude.

Methods: Two randomized, double-blind, placebo-controlled cohort studies were conducted in which participants were treated with GBE (240 mg x d(-1)) or placebo prior to and including the day of ascent from 1600 m to 4300 m (ascent in 2 hours by car). Acute mountain sickness was diagnosed if the Environmental Symptom Questionnaire III acute mountain sickness-cerebral (AMS-C) score was > or =0.7 and the Lake Louise Symptom (LLS) score was > or =3 and the participant reported a headache. Symptom severity was also determined by these scores.

Results: Results were conflicting: Ginkgo biloba reduced the incidence and severity of AMS compared to placebo in the first but not the second study. In the first study, GBE reduced AMS incidence (7/21) vs placebo (13/19) (P = .027, number needed to treat = 3), and it also reduced severity (AMS-C = 0.77 +/- 0.26 vs 1.59 +/- 0.27, P = .029). In the second study, GBE did not reduce incidence or severity of AMS (GBE 4/15 vs placebo 10/22, P = .247; AMS-C = 0.48 +/- 0.13 vs 0.58 +/- 0.11, P = .272). The primary difference between the 2 studies was the source of GBE.

Conclusions: The source and composition of GBE products may determine the effectiveness of GBE for prophylaxis of AMS.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Altitude Sickness / epidemiology
  • Altitude Sickness / pathology
  • Altitude Sickness / prevention & control*
  • Dose-Response Relationship, Drug
  • Double-Blind Method
  • Female
  • Ginkgo biloba / chemistry*
  • Humans
  • Male
  • Middle Aged
  • Mountaineering
  • Phytotherapy
  • Plant Extracts / analysis
  • Plant Extracts / pharmacology*
  • Severity of Illness Index
  • Treatment Outcome
  • Young Adult

Substances

  • Plant Extracts