Is increased time at altitude associated with an increased risk of DCS?

Is increased time at altitude associated with an increased risk of DCS?

• A. True
• B. False
• C. Only during rapid ascent
• D. Only at extreme temperatures.

Answer: (A)

Exposure duration at altitude under reduced ambient pressure raises the risk of decompression sickness because nitrogen dissolved in body tissues can become supersaturated and form gas bubbles as the pressure stays low. The longer you remain at altitude, the more opportunity nitrogen has to offgas and potentially coalesce into bubbles that can disrupt tissues or the circulation. While rapid ascent adds to the risk, extended exposure alone increases the chance of DCS. Temperature effects exist but are not the primary driver; the key factor is the combination of lower pressure and longer time at that pressure.

Exposure duration at altitude under reduced ambient pressure raises the risk of decompression sickness because nitrogen dissolved in body tissues can become supersaturated and form gas bubbles as the pressure stays low. The longer you remain at altitude, the more opportunity nitrogen has to offgas and potentially coalesce into bubbles that can disrupt tissues or the circulation. While rapid ascent adds to the risk, extended exposure alone increases the chance of DCS. Temperature effects exist but are not the primary driver; the key factor is the combination of lower pressure and longer time at that pressure.