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J Korean Med Assoc > Volume 50(11); 2007 > Article
Kim and Lee: Treatment and Prevention of High Altitude Illness and Mountain Sickness

Abstract

High-altitude illness is used to describe various symptoms that can develop in unacclimatized persons on ascent to high altitude. Symptoms usually include headache, anorexia, nausea, vomiting, fatigue, dizziness, and sleep disturbance. In fact, high-altitude illness comprises of acute mountain sickness (AMS) and its life-threatening complications, high-altitude cerebral edema (HACE) and high-altitude pulmonary edema (HAPE). Since there are many travelers who visit high-altitude locations these days, high-altitude illness has become a public health problem. Therefore, physicians need to be familiar with the condition and be able to advise those who are going to reach high altitude how to prevent or minimize the illness and treat patients who suffer from it.

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Figure 1
The relationship of altitude, barometric pressure, and oxygen saturation. As altitude increases and barometric pressure decreases inspired (PIO2) and arterial partial pressure of oxygen (Pao2) including oxygen saturation (Sao2) all decrease. Oxygen saturation is maintained till about 3000m. Although it can occur earlier, this is also the approximate altitude where altitude sickness starts being more obvious with rapid ascents. With ascent hyperventilation narrows the initial difference between PIO2 and Pao2 to help maintain saturation of oxygen (1, 2).
jkma-50-1005-g001-l.jpg
Figure 2
At high altitudes hypoxemia can lead to overperfusion, elevated capillary pressure, and leakage from the cerebral microcirculation. Increased sympathetic activity has a central role in this process, and increased permeability of capillaries as a result of endothelial activation (inflammation) may also have a role. AMS and HACE seem to be a continuum (BBB: blood brain barrier, VEGF: vascular endothelial growth factor, Pcap: capillary pressure, iNOS: inducible nitric oxide synthase, HVR: hypoxic ventilatory response)(29).
jkma-50-1005-g002-l.jpg
Figure 3
Pathophysiology of high altitude pulmonary edema and the role the proposed agents sildenafil and theophylline may play (69).
jkma-50-1005-g003-l.jpg
Table 1
Differential diagnosis of high altitude illness(29)
jkma-50-1005-i001-l.jpg


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