Introduction High-altitude mountaineering presents a physiological problem that fitness, determination and technical ability cannot eliminate. As altitude increases, atmospheric pressure falls. Although the proportion of oxygen in the atmosphere remains essentially unchanged, its partial pressure falls with altitude. Less oxygen is therefore available to move from the lungs into the blood. The resulting hypobaric hypoxia … Continue reading Too High, Too Fast: Altitude Sickness, HACE, HAPE and the Case for Proper Acclimatisation