[abstract] A COMPARISON OF RECENT FLYING AFTER DIVING EXPERIMENTS WITH PUBLISHED FLYING AFTER DIVING GUIDELINES

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[abstract] A COMPARISON OF RECENT FLYING AFTER DIVING EXPERIMENTS WITH PUBLISHED FLYING AFTER DIVING GUIDELINES

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Title: [abstract] A COMPARISON OF RECENT FLYING AFTER DIVING EXPERIMENTS WITH PUBLISHED FLYING AFTER DIVING GUIDELINES
Author: Vann, RD; Gerth, WA; DeNoble, PJ; Sitzes, CR; Smith, LR
Abstract: BACKGROUND: Few empirical data address the decompression sickness (DCS) that occurs with flying at airline cabin altitudes (less than 8,000 feet) after air diving. This may explain why published flying after diving guidelines vary widely. We compare various guidelines with recent flying after diving trials. METHODS: 283 trials were conducted under IRB-approved Acceptance and Rejection Rules (Accept: 0 DCS/23 trials, 1 DCS/35 trials, 2 DCS/46 trials. Reject: any neuro-DCS, 2 DCS-pain/10 trials, 3 DCS-pain). Preflight surface intervals (SI) were tested for 1 dive (60'/55 min), 2 dives (60'/55 min - 60 min SI-60'/20 min) and 3 dives (60'/55 min-60 min SI-60'/20 min-60 min SI-60'/20 min). Subjects were dry and resting. Preflight SIs were followed by 4 hr flights at 8,000 ft. INSERT FIGURE RESULTS: 6 of 8 DCS incidents were neurological. DCS-free SIs did not differ for 2 and 3 dives but were longer than for 1 dive (see Fig.). USN and DAN guidelines for 1 no-stop dive are 2 and 12 hr preflight SIs. The USAF guideline is 24 hrs after any diving. A 12 hr guideline is consistent with the 1 dive results. A 2 hr guideline seems short. A 24 hr guideline appears conservative. For repet, decompression, or multi-day dives, the USN guideline is 12 hrs, and the DAN guideline greater than 12 hrs. The results suggest that greater than 12 hrs are needed after repetitive dives. The NOAA "Group D" rule (Repet Group D before flying) requires a 2:45 SI for 1 dive and is inconsistent with the results. The 39th UHMS Workshop guideline is 12 hrs after total no-stop times of less than 2 hrs in 48 hrs. This is consistent with the 1 dive results but not with the 2 or 3 dive results. CONCLUSION: Current DAN guidelines are consistent with experimental results. Further trials are in progress to find if this applies to other dive profiles and to wet, working dives. (Supported by DAN and PADI).
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: http://archive.rubicon-foundation.org/494
Date: 1996

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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