At what altitudes is pulmonary edema likely to occur?

• A. 5000-7000 ft
• B. 9000-10000 ft
• C. 11000-13000 ft
• D. 15000 ft and above

Answer: (B)

Pulmonary edema, specifically high-altitude pulmonary edema (HAPE), primarily occurs at altitudes above 8,000 feet. However, the risk of developing this condition increases significantly as one ascends to higher altitudes. Typically, symptoms can start to manifest around 9,000 to 10,000 feet. This range is where many individuals, especially those who ascend too quickly without acclimatization, may experience the initial signs of altitude sickness, including pulmonary edema.

Though higher altitudes (such as significantly above 10,000 feet) increase the risk, the range of 9,000 to 10,000 feet is particularly crucial as it is often considered a transitional altitude where less acclimatized individuals may begin to struggle. It's essential to understand these altitudes to implement preventive measures for those engaging in mountaineering or other high-altitude activities.