What's The Risk Of HAPE Or HACE?

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At extreme altitudes, sleeping becomes very difficult, digesting food is near-impossible, and the risk of HAPE or HACE increases greatly. HACE may include profoundly inhibited mental function, hallucinations, loss of muscle coordination, impaired speech, severe headache, nausea or vomiting and coma. HAPE may include extreme difficulty breathing, very rapid breathing rate, exhaustion, lack of motivation, pale complexion, constant coughing and gurgling sounds coming from chest. The death zone, refers to altitudes above a certain point where the amount of oxygen is insufficient to sustain human life. This point is generally tagged as 8,000 m (26,000 ft). Any time that the temperature is below -4°C (25°F), skin's freezing point, people are at risk

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