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June 23, 1989, Vol 261, No. 24 >
ARTICLE | June 23, 1989

Incidence of Acute Mountain Sickness at Intermediate Altitudes

Charles S. Houston, MD
JAMA. 1989;261(24):3551-3552. doi:10.1001/jama.1989.03420240065022.
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To the Editor. —  As more and more people flock to mountain resorts, it is evident that acute mountain sickness exacts a significant human and economic toll at even moderate altitude. Singh et al,1 describing 1905 cases among Indian troops, found incidences ranging from 0.8% to 8.0% between companies. Hackett et al2 reported that 52.5% of 278 trekkers at 4200 m in Nepal had one of several forms of altitude sickness, while Larsen et al,3 in a double-blind study on 4200-m Mt Rainier, found that 25% of untreated subjects experienced acute mountain sickness. R. Yip (personal communication, 1989) questioned 101 epidemiologists at a meeting at 2940 m in Colorado; of these, 42% had typical acute mountain sickness. In 1982, a survey4 of 3906 visitors at six Colorado resorts between 2400 and 2850 m in elevation showed that 12% had three or more of the five classic

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