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Mountaineering brings many health risks, one of which is mountain sickness. Its mildest form - acute mountain sickness - is mainly characterized by subjective symptoms (headache, loss of appetite, insomnia, weakness, nausea and rarely also vomiting). Advanced and life-threatening forms are
As the number of international, adventure, and wilderness travelers increase, physicians in all locations and types of practices may be asked to counsel and provide prophylaxis or self-treatment for a variety of travel-related illnesses. At higher altitudes, the decreased partial pressure of oxygen
Acute mountain sickness is a pathologic reaction as a result of bad adaptation to high altitudes (greater than 2.500 meters). The main symptoms are headache, nausea, vomits, and insomnia. When severe it can produce oliguria, retinal hemorrhage, ataxia and sometimes coma. Its etiology is not well
Physical exertion is thought to exacerbate acute mountain sickness (AMS). In this prospective, randomized, crossover trial, we investigated whether moderate exercise worsens AMS in normobaric hypoxia (12% oxygen, equivalent to 4,500 m). Sixteen subjects were exposed to altitude twice: once with
BACKGROUND
Hypoxemia is the immediate consequence of hyobaric hypoxia, which is the crucial starting mechanism of acute mountain sickness (AMS). The AMS is generally a benign and self-limiting condition which can be prevented by gradual ascent. However, ascent rates recommended for prophylaxis of
Traditionally, scientists and clinicians have explored peripheral physiological responses to acute hypoxia to explain the pathophysiological processes that lead to acute mountain sickness (AMS) and high-altitude cerebral edema (HACE). After more than 100 years of investigation, little is yet known
BACKGROUND
Chronic mountain sickness (CMS) is characterized by a combination of excessive erythrocytosis,severe hypoxemia, and pulmonary hypertension, all of which affect exercise capacity.
METHODS
Thirteen patients with CMS and 15 healthy highlander and 15 newcomer lowlander control subjects were
In a normal subject, exposure to high altitude is accompanied by a diminution in performance that is proportional to the hypoxia. In order to advise a cardiac patient who is contemplating undertaking a physical activity in the mountains and wishes to avoid taking any unnecessary risks in an
This study examined the hypothesis that prevention of hypocapnia and alkalosis would ameliorate the symptoms of acute mountain sickness (AMS). Five subjects were exposed to simulated high altitude for 4 d with 3.8% CO2 added to the chamber to maintain normocapnia. Four other subjects were exposed
Enhanced sympathoadrenal activity has been implicated in the pathogenesis of acute mountain sickness (AMS). This study was designed to examine the time course of circulating catecholamines in individuals with and without AMS.
METHODS
Subjects were low-altitude residents (10 men, 8 women) who had not
Hypoxemia is usually associated with acute mountain sickness (AMS), but most studies have varied in time and magnitude of altitude exposure, exercise, diet, environmental conditions, and severity of pulmonary edema. We wished to determine whether hypoxemia occurred early in subjects who developed
Chronic mountain sickness is a syndrome of severe symptomatic polycythemia and hypoxemia occurring in natives or long-term high altitude sojourners. The condition may be complicated by pulmonary hypertension in proportion to decreased oxygenation, indicating hypoxic vasoconstriction and remodeling.