Outdoor high-altitude

      High-altitude pulmonary edema is an acute disease triggered by severe oxygen deficiency in high-altitude areas and is common at elevations above 3,000 meters. It frequently affects individuals who rapidly ascend to high altitudes for the first time, move from high-altitude regions to even higher elevations, or return to high altitudes after residing on the plains for a while. The primary conditions leading to high-altitude pulmonary edema are altitude, cold, and individual differences. The first two are external factors, while the latter relates to internal factors — specifically, a poor ability to adapt to low oxygen levels.
High-altitude pulmonary edema is characterized by rapid onset, swift progression of symptoms, and a prognosis that depends on early diagnosis and timely treatment. With prompt diagnosis and care, most patients recover within 3–6 days. However, delayed diagnosis and lack of treatment can be fatal. If complicated by high-altitude coma or severe infection, the prognosis is very poor. Patients who quickly ascend to high altitudes should be alert to the onset of the illness if, on top of acute high-altitude reactions, they experience severe headaches, extreme fatigue, difficulty breathing, persistent dry cough, bluish or grayish lips and tongue, pale or ashen complexion. If coughing produces light yellow or pink frothy sputum, or if wet rales are heard in the lungs after coughing, along with supportive diagnostic findings such as chest fluoroscopy or X-rays, a diagnosis of high-altitude pulmonary edema can be confirmed.

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