Clinical features of headache at altitude: a prospective study.
BACKGROUND: Headache is the most common nervous system complication at altitude; however, there have been few attempts to characterize clinical features of high-altitude headaches (HAH). OBJECTIVE: To measure prospectively the incidence of HAH and to determine its risk factors and characteristics. METHODS: Members of an expedition to Kanchenjunga base camp in Nepal (5,100 m) were prospectively studied. Subjects were interviewed prior to the trip and while trekking recorded headaches experienc...Expand abstract
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