In the realm of high-altitude medicine, the term high altitude refers to terrestrial elevations
over 1500 m (4921 ft), and is commonly divided into three categories: high altitude, very high …

Mountains and high plateaus cover about one fifth of the Earth's surface and are home to
over 300 million people. 20 At least half of this number live permanently above 2400 meters …

Key Clinical Points Acute High-Altitude Illnesses Acute high-altitude illnesses occur in
persons who are not acclimatized during the first days at an altitude of 2500 m or higher …

Background The concentration of oxygen in air remains constant at 21% regardless of the
altitude. However, the partial pressure of oxygen decreases with increasing altitude …

High-altitude illnesses have profound consequences on the health of many unsuspecting
and otherwise healthy individuals who sojourn to high altitude for recreation and work. The …

In high altitudes, usually above 2500 m, travelers are faced with decreased partial pressure
of oxygen along with decreased barometric pressure. High-altitude illness, a syndrome of …

After ascent to high altitude (≥ 2500 m), the inability of the human body to adapt to the
hypobaric and hypoxia environment can induce tissue hypoxia, then a series of high altitude …

As increasing numbers of people choose to sojourn or retire to the mountains, high-altitude
illness is becoming a pathological phenomenon about which healthcare providers should …

High-altitude illnesses encompass the pulmonary and cerebral syndromes that occur in non-
acclimatized individuals after rapid ascent to high altitude. The most common syndrome is …

The term “high-altitude illness” is used to describe the cerebral and pulmonary syndromes
that can develop in unacclimatized persons shortly after ascent to high altitude. Acute …