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Bubble formation and decompression sickness on direct ascent from shallow air saturation diving
T Ikeda1, Y Okamoto, A Hashimoto
1Maritime Self-Defense Force, Undersea Medical Center, Yokosuka, Japan.
Aviation, Space, and Environmental Medicine
|February 1, 1993
Summary
Shallow air dives revealed that detectable bubble formation occurs around 6 meters. Direct ascent from 8 meters saturation poses a significant risk for decompression sickness (DCS).
Area of Science:
- Physiology
- Diving Medicine
- Biomedical Engineering
Background:
- Investigating the threshold for bubble formation and decompression sickness (DCS) is crucial for diver safety.
- Shallow air saturation dives were conducted to determine the minimum supersaturation pressure for detectable bubble formation and DCS onset.
- The ultrasonic M-mode method was employed for sensitive bubble detection.
Observation:
- Three dives were performed at 6m, 7m, and 8m with 3-day saturation periods.
- Bubble formation was observed in 6m (one streak), 7m (four subjects), and 8m (all subjects) dives.
- Decompression sickness (DCS) occurred in four subjects at 8m, necessitating recompression.
Findings:
- The minimum depth for detectable bubble formation was determined to be approximately 6 meters.
- Direct ascent from 8 meters after saturation diving presents a high risk of developing DCS.
- Bubble formation does not always correlate with symptomatic DCS at shallower depths.
Implications:
- Findings suggest that 6 meters is a critical depth for bubble formation in shallow saturation dives.
- Divers ascending directly from 8 meters saturation are at increased risk of DCS.
- This research informs safer decompression protocols for shallow diving operations.