Altitude decompression sickness between 6858 and 9144 m following a 1-h prebreathe.

摘要: Abstract : The zero prebreathe altitude threshold for developing 5% decompression sickness (DCS) symptoms in men has been reported to be 6248 meters (20,500 ft). However, such an when 1 hour of oxygen is used not well-documented and was the primary purpose this study. 51 male subjects were exposed 9144 (30,000 ft), 8382 (27,500 7620 (25,000 and/or 6858 (22,500 ft) 8 hours. They monitored DCS venous gas emboli (VGE). results showed that symptom incidence after 4 hours exposure decreased with from 87% at 26% meters. VGE lower during 4-hour, 6858-meter exposures (32%) than higher altitudes (76%-85%). incidences first following a 1-hour as compared analogous zero-prebreathe exposures. There no differences between or any four vs. exposure. overall show below prebreathe. 7620-meter exposures, highly beneficial reducing delaying onset DCS, keeping less 6% 90 minutes Use 4-hour versus 8-hour does appear underestimate risk above data study also provided possible insight regarding effects exercise on incidence. other same duration, mild prebreathe, perhaps because exercises experiment involved more stress body most authors' experiments. 7