altitude sickness

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Related to Acute mountain sickness: acetazolamide, chronic mountain sickness

altitude sickness:

see decompression sicknessdecompression sickness,
physiological disorder caused by a rapid decrease in atmospheric pressure, resulting in the release of nitrogen bubbles into the body tissues. It is also known as caisson disease, altitude sickness, and the bends.
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Altitude Sickness

 

a pathological condition that arises upon ascent to great heights (above 3,000 m) resulting from lowered partial pressure of oxygen in inhaled air. The development of altitude sickness is associated with a disturbance of the function of certain organs and systems, chiefly of the cells of the higher sections of the central nervous system, resulting from oxygen starvation, or hypoxia. At heights under 3,000 m, a healthy person’s oxygen deficiency is compensated for by an increase in pulmonary ventilation (faster and deeper breathing), in blood circulation, and in hemoglobin and erythrocyte count in the blood. Further ascent brings on hypoxia, since the functions of the organism can no longer provide sufficient compensation. A shortage of oxygen in the surrounding air leads to lowered partial pressure of oxygen in the lungs and to lowered oxygen saturation of arterial blood. The major symptoms of altitude sickness include shortness of breath, heart palpitations, dizziness, noise in the ears, headache, nausea, weakness of the muscles, perspiration, blurred vision, sleepiness, and decreased stamina. The symptoms develop in phases, depending on the speed of ascent and on the functional state of the organism. Alcohol, fatigue, and insomnia lower the tolerance for great heights.

Treatments for altitude sickness include descent to a lower altitude, rest, cardiac medicines, and strong tea or coffee. In severe cases, inhalation of oxygen is called for. Inhalation of oxygen from a special apparatus while ascending to great heights prevents altitude sickness. Sports that increase the organism’s demand for oxygen and thus cause hypoxia develop the organism’s resistance to hypoxia. One variant of altitude sickness is mountain sickness. Along with an oxygen deficiency, other factors in mountain sickness are physical exhaustion, cold, and ultraviolet radiation. With acclimatization to the mountain climate, the symptoms of mountain sickness weaken. Relative stabilization of the physiological indexes begins after approximately a three-week stay in the mountains.

N. A. AGADZHANIAN

altitude sickness

[′al·tə‚tüd ‚sik·nəs]
(medicine)
In general, any sickness brought on by exposure to reduced oxygen tension and barometric pressure.

altitude sickness

In general, any sickness brought on by exposure to reduced partial pressure of oxygen and barometric pressure.
References in periodicals archive ?
[14.] Grissom CK, Roach RC, Sarnquist FH, et al Acetazolamide in the treatment of acute mountain sickness: Clinical efficacy and effect on gas exchange.
Acute mountain sickness: influence of susceptibility, preexposure, and ascent rate.
Tikkanen, "Prevalence of acute mountain sickness among finnish trekkers on Mount Kilimanjaro, Tanzania: an observational study," High Altitude Medicine and Biology, vol.
Nirkko et al., "Hypoxia-induced acute mountain sickness is associated with intracellular cerebral edema: a 3 T magnetic resonance imaging study," Journal of Cerebral Blood Flow and Metabolism, vol.
Smoking is a risk factor for acute mountain sickness.
Abbreviations: AMS = acute mountain sickness, ANCOVA = analysis of covariance, HA = high altitude, HAI = high altitude illness, LLS = Lake Louise Score, MS = multiple sclerosis, NVWSC = National Veterans Winter Sports Clinic, SCI = spinal cord injury, TBI = traumatic brain injury.
Randomised, double blind, placebo controlled comparison of ginkgo biloba and acetazolamide for prevention of acute mountain sickness among Himalayan trekkers: the prevention of high altitude illness trial (PHAIT).
People have different susceptibilities to altitude sickness; for some otherwise healthy people, Acute Mountain Sickness (AMS) can begin to appear at around 2000 metres (6,500 ft) above sea level, such as at many mountain ski resorts.
High-altitude illness refers to acute mountain sickness (AMS), high-altitude cerebral edema (HACE), and high-altitude pulmonary edema (HAPE).
In the evening I still feel woozy and begin to take Diamox - a drug that can help counter the affects of AMS - acute mountain sickness, or altitude sickness.
Regardless of their levels of physical conditioning, Soldiers can experience increased fatigue or even acute mountain sickness in this environment.
The expedition was not a success for everyone taking part and Dr Shakeeb revealed two female climbers had died as a result of cerebral and lung edema (acute mountain sickness), after failing to strictly adhere to their acclimatisation programme.

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