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A 35-year-old man on a trek to the Mount Everest region of Nepal presented with a sudden, acute confusional state at an altitude of about 5000 m. Although described at higher altitudes, delirium presenting alone has not been documented at 5000 m or at lower high altitudes. The differential diagnosis which includes acute mountain sickness and high altitude cerebral edema is discussed. Finally, the importance of travelling with a reliable partner and using proper insurance is emphasized in treks to the Himalayas.

Original publication




Journal article


High Alt Med Biol

Publication Date





69 - 71


Adult, Altitude, Altitude Sickness, Brain Edema, Delirium, Diagnosis, Differential, Humans, Hypoxia, Male, Mountaineering