Undersea Hyperbar M
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Undersea Hyperbar M · Dec 1995
Ascent rate, post-dive exercise, and decompression sickness in the rat.
The effects of ascent rate and post-dive exercise on the incidence of decompression sickness (DCS) were investigated in six groups of 20 rats exposed for 2 h at a pressure equivalent to 240 feet of sea water (fsw; 735 kPa). Ascent rates were 30, 45, and 60 fsw/min (92, 138, 184 kPa/min), and the rats either rested after the exposure or exercised by walking for 30 min on a treadmill at 1.6 m/min. Post-dive signs included respiratory distress, difficulty walking, paralysis, and death. ⋯ Analysis by ordinal logistic regression indicated more DCS with post-dive exercise (P = 0.0112) and at 45 (P = 0.0011) and 60 fsw/min (P = 0.0001) compared to 30 fsw/min. Survival analysis suggested earlier death at 60 fsw/min compared to 30 fsw/min (P = 0.0006). Similar effects have been reported for the less severe DCS that occurs in humans.
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Undersea Hyperbar M · Jun 1993
Case ReportsAir embolism with bilateral pneumothorax after a five-meter dive.
After an emergency ascent from very shallow depth, a diver suffered a triad of symptoms after bilateral barotrauma of the lungs: air embolism with subsequent paraparesis, pneumomediastinum, and bilateral pneumothorax. This is the first case of its kind in 20 yr of experience in the hyperbaric center at Graz. The patient was successfully treated by recompression with HBO.