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The effects of high altitude on humans are mostly the consequences of reduced partial pressure of oxygen in the atmosphere. The medical problems that are direct consequence of high altitude are caused by the low inspired partial pressure of oxygen, which is caused by the reduced atmospheric pressure, and the constant gas fraction of oxygen in ...
High-altitude pulmonary edema (HAPE) is a life-threatening form of non-cardiogenic pulmonary edema that occurs in otherwise healthy people at altitudes typically above 2,500 meters (8,200 ft). [2] HAPE is a severe presentation of altitude sickness .
Hiking in the San Juan Mountains, Colorado A hiker enjoying the view of the Alps. A hike is a long, ... In high mountains a further danger is altitude sickness. This ...
What is high-altitude pulmonary edema? NBC News correspondent Morgan Chesky describes incident that could have led to a cardiac arrest as he was hiking.
Mountain sickness may progress to HACE (high-altitude cerebral edema) and HAPE (high-altitude pulmonary edema), both of which can be fatal within 24 hours. [43] [45] [47] In high mountains, atmospheric pressure is lower and this means that less oxygen is available to breathe. [43] This is the underlying cause of altitude sickness.
At very high altitude, 3,500 to 5,500 metres (11,500 to 18,000 ft), maximum SaO 2 falls below 90% as the arterial PO 2 falls below 60mmHg. Extreme hypoxemia may occur during exercise, during sleep, and in the presence of high altitude pulmonary edema or other acute lung conditions. Severe altitude illness occurs most commonly in this range.
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