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[1] [2] Chronic mountain sickness may occur after long-term exposure to high altitude. [2] Altitude sickness typically occurs only above 2,500 metres (8,000 ft), though some people are affected at lower altitudes. [2] [4] Risk factors include a prior episode of altitude sickness, a high degree of activity, and a rapid increase in elevation. [2]
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 atmospheric air over the range in which humans can survive. [1]
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. Cases have also been reported between 1,500–2,500 metres or 4,900–8,200 feet in people who ...
By contrast, the women of long-resident, high-altitude populations are known to give birth to heavier-weight infants than women of the lowland. This is particularly true among Tibetan babies, whose average birth weight is 294–650g (~470) g heavier than the surrounding Chinese population , and their blood-oxygen level is considerably higher.
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)).
Failure to acclimatize may result in altitude sickness, including high-altitude pulmonary edema or cerebral edema . [ 11 ] [ 12 ] Humans have survived for 2 years at 5,950 m (19,520 ft) [475 millibars (14.0 inHg; 6.89 psi) of atmospheric pressure], which appears to be near the limit of the permanently tolerable highest altitude. [ 13 ]
High-altitude cerebral edema (HACE) is a medical condition in which the brain swells with fluid because of the physiological effects of traveling to a high altitude. It generally appears in patients who have acute mountain sickness and involves disorientation, lethargy, and nausea among other symptoms.
Used as coca tea or chewed, traditionally as a stimulant to overcome fatigue, hunger, thirst, and altitude sickness. [64] Also used as an anesthetic and analgesic. [65] Eschscholzia californica: Californian poppy Used as a herbal remedy: an aqueous extract of the plant has sedative and anxiolytic actions. [66] Eucalyptus globulus: Eucalyptus
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