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Altitude sickness, the mildest form being acute mountain sickness (AMS), is a harmful effect of high altitude, caused by rapid exposure to low amounts of oxygen at high elevation. [ 1 ] [ 2 ] [ 3 ] People's bodies can respond to high altitude in different ways.
Chronic mountain sickness (CMS) is a disease in which the proportion of blood volume that is occupied by red blood cells increases (polycythaemia) and there is an abnormally low level of oxygen in the blood . CMS typically develops after extended time living at high altitude (over 2,500 metres (8,200 ft)).
All 14 summits in the death zone above 8000 m, called eight-thousanders, are located in the Himalaya and Karakoram mountain ranges. Many deaths in high-altitude mountaineering have been caused by the effects of the death zone, either directly by loss of vital functions or indirectly through wrong decisions made under stress or physical ...
[1] [4] [5] Scientists at the High Altitude Pathology Institute in Bolivia dispute the existence of a death zone, based on observation of extreme tolerance to hypoxia in patients with chronic mountain sickness and normal fetuses in-utero, both of which present pO 2 levels similar to those at the summit of Mount Everest. [16]
The suggested rate of ascent is the same that applies to the prevention of acute mountain sickness and high-altitude cerebral edema. The Wilderness Medical Society (WMS) recommends that, above 3,000 metres (9,800 ft), climbers not increase the sleeping elevation by more than 500 metres (1,600 ft) a day, and
They show a sustained increase in cerebral blood flow, lower hemoglobin concentration, and less susceptibility to chronic mountain sickness than other populations due to their longer history of high-altitude habitation. [33] [34] With the proper physical preparation, individuals can develop short-term tolerance to high-altitude conditions.
Durango is served by U.S. Highway 160 (the Old Spanish Trail), running east–west, and U.S. Highway 550, running north–south. Part of U.S. 550 offers high-speed access (primarily a 4-lane, divided highway) to Albuquerque, New Mexico. North of Durango, 550 is nicknamed the Million Dollar Highway, and is part of the scenic San Juan Skyway.
Mountain sickness can refer to: Altitude sickness or acute mountain sickness, a pathological condition that is caused by acute exposure to low air pressure;