Decompression from a Deep Nitrogen/Oxygen Saturation Dive. A Case Report,
DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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Ten divers participated in a 4.5 day nitrogenoxygen saturation dive to 165 fsw. There were daily 2 hour excursions to 200 fsw. The divers breathed air during the excursions and 0.5 ATM oxygen in nitrogen at 165 fsw. The final decompression began 6 hours after the last excursion. The oxygen partial pressure was 0.5 ATM from 165 to 45 fsw, and air was used from 45fsw to the surface. By 20 fsu, 4 divers had developed decompression sickness. A fifth diver developed decompression sickness during a commercial air flight 68 hours after surfacing. Comparison of ascent rates for this dive and for air or nitrogenoxygen saturation dives reported in the literature suggests that deeper dives require slower rates of ascent. Dives shallower than 100 fsw had a mean ascent rate of 3.2 fswhr and 14 decompression incidents in 107 man-exposures. Dives deeper than 100 fsw had a mean rate of 2.5 fswhr and 14 incidents in 45 man-exposures.
- Stress Physiology