[abstract] NO-STOP REPETITIVE N2/O2 DIVING WITH SURFACE INTERVAL O2 (SIO2): CALCULATION OF SCHEDULES.

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[abstract] NO-STOP REPETITIVE N2/O2 DIVING WITH SURFACE INTERVAL O2 (SIO2): CALCULATION OF SCHEDULES.

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Title: [abstract] NO-STOP REPETITIVE N2/O2 DIVING WITH SURFACE INTERVAL O2 (SIO2): CALCULATION OF SCHEDULES.
Author: Gerth, WA; Vann, RD; Southerland, DG
Abstract: The risk of decompression sickness (DCS) in repetitive diving inevitably limits the safely allowable depths and bottom times, or requires prolongation of surface intervals between dives. Longer bottom times and shorter surface intervals are theoretically afforded by breathing oxygen-enriched air, or nitrox, at depth and 100% oxygen at surface. The former reduces N2 uptake at pressure while the latter accelerates N2 elimination between dives. Repetitive dive schedules for chamber and field trials of these concepts were computed through a modeling effort based on maximum likelihood. The model was founded on the assumption that DCS is caused by tissular gas bubble formation that is governed in turn by the kinetics of gas exchange between blood and tissue and between tissue and bubbles. Diver susceptibility to the bubbles and the corresponding probability of DCS was postulated to increase with bubble volume according to a log-normal statistical distribution. Maximum likelihood techniques were used to optimize model parameter values about actual DCS incidence data for a wide variety of dive profiles. The parameterized model was then used to estimate the bottom time maxima in repetitive dive profiles with nitrox breathing at depth and 100% oxygen breathing during surface intervals of specific duration. Resultant schedules, tests of which are presented in separate reports, incorporate substantially longer bottom times and more frequent repetitive dives, with no increases in attendant risks of DCS, than those allowable with air breathing alone. Supported by NOAA/NURP at UNC-W, NA88AA-D-UR004.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held June 23-27, 1992. Hyatt Regency Bethesda Hotel, Bethesda, Maryland (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/7030
Date: 1992

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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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