British military personnel are frequently exposed to high altitude (HA) (>1500m). Operations in Afghanistan have occurred at altitudes of up to 3000m and there remains the possibility of rapid deployment of non-acclimatised troops to HA areas. British military personnel also deploy to HA frequently on Adventurous Training (AT) and there are numerous expeditions every year to the Greater Ranges. As such, there remains a reasonable likelihood of the development of high altitude illness (HAI) with potentially life-threatening consequences. This article aims to provide an overview of the adaptive (acclimatisation) and pathological (acute HAI) responses to HA exposure, with particular reference to military deployments.
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