[abstract] DCS RISK AND NO-STOP AIR DIVING.

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[abstract] DCS RISK AND NO-STOP AIR DIVING.

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Title: [abstract] DCS RISK AND NO-STOP AIR DIVING.
Author: Vann, RD
Abstract: The results of 2,020 air and N2-02 no-stop dives (158 DCS cases) were found in the literature. An empirical decompression "dose" and a DCS risk were calculated for each dive with Hempleman's "root-t" rule (Spencer, JAP 40(2): 229, 1976) and a dose-response curve. The best agreement between predicted and observed DCS risk was determined by the maximum likelihood method (Weathersby et al., JAP 57(3): 815, 1984). DCS risks were estimated for USN no-stop dive limits and Huggins' shorter limits. For for any depth (see Table), DCS risk decreased slowly as bottom time was reduced. For a 1% risk, bottom times were about half Huggins' limits. The appropriate question is not "What are the safe no-stop limits?" but "What DCS risk is acceptable?" A small DCS incidence appears unavoidable. For example, in 4 years of Navy diving (22 DCS cases in 242,778 no-stop dives), 17 DCS cases occurred well within the USN limits. An organization such as the Divers Alert Network can play an important role in handling these unexpected events. Depth (Navy) Time Risk (Huggins) Time Risk; 35' 310 11.9% 165 4.0%; 40 200 8.8 135 4.4; 50 100 5.6 75 3.4; 60 60 4.3 50 3.1; 70 50 5.3 40 3.5; 80 40 5.7 30 3.4; 90 30 5.1 25 3.7; 100 25 5.3 20 3.6; 110 20 5.0 15 3.0; 120 15 4.1 10 1.9; 130 10 2.6 5 0.7; 140 10 3.4 - -; 150 5 1.2 - -; 160 5 1.5 - -; 170 5 1.9 - -; 180 5 2.3 - -; 190 5 2.8 - -.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held 11-14 June 1985. The Hyatt Regency Hotel, Long Beach, California (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/5439
Date: 1985

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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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