【Bon appétit !】 Mount Everest Deaths Result from Brain Swelling
Adventurers who dare to scale(登る)Mount Everest, the highest mountain peak in the world, face many dangers including extreme cold, strong winds, treacherous(安定しない、危険な)climbs, and avalanches. Since 1921, more than 200 people have died attempting to summit the 29,000-ft (8,850-m) peak. Researchers investigating these deaths had expected to find that many resulted from pulmonary(肺の)issues, however, they instead found that high-altitude cerebral edema(浮腫、水腫)was largely to blame. The low oxygen levels found at such high altitudes cause cerebral blood vessels to leak fluid into surrounding brain tissue, triggering swelling that results in confusion and loss of coordination.