Pulmonary Effects of Six-Hour Dives: In-Water or Dry Chamber Exposure to an Oxygen Partial Pressure of 1.6 ATM
NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL
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Pulmonary effects of exposure to hyperbatic oxygen in the water were compared to those for similar exposure in adry chamber. For six hours, 34 subjects breathed 100 oxygen at 20 feet of seawater, in either the wet pot or a dry chamber of the Navy Experimental Diving Unit Ocean Simulation Facility, with 28 individuals participating in both dives and 12 able to dive only once. Owes were two months apart. Forced flow volume loops, diffusing capacty measurements, and reported respiratory and other symptoms were recorded before and after the dives. A few mild changes in pulmonary function were seen in seven subjects at any time after dry dives and in four any time after wet dfves, with one subject affected after both dives. Dive-related symptoms, mostly mild, were more common than such pulmonary changes in 13 subjects any time duting or after dry dives, in 14 during or after wet dives, and in 9 after both dives. Two subjects reported moderate svmptoms, one after a dry dive and one after a wet dive. One diver left the water after three hours because of nausea. Except for Draeger ear, which may have been more common after wet dives than after dry exposures Six subjects versus two, p 0.078, there were no differences in effects. We conclude that dry exposures can be used to predict in-water pulmonary oxygen toxici at the same oxygen artial ressure.
- Submarine Engineering