[abstract] OXYGEN'S ROLE IN HUMAN DCS AFTER NITROGEN-OXYGEN DIVING.

Rubicon Research Repository/Manakin Repository

[abstract] OXYGEN'S ROLE IN HUMAN DCS AFTER NITROGEN-OXYGEN DIVING.

Show full item record


Title: [abstract] OXYGEN'S ROLE IN HUMAN DCS AFTER NITROGEN-OXYGEN DIVING.
Author: Weathersby, PK; Hart, BL; Flynn, ET; Walker, WF
Abstract: In the calculation of decompression schedules, it is commonly assumed that only the inert gas needs to be considered: all inspired oxygen is ignored. Animal experiments have shown that high 02 can increase the risk of serious cases of decompression sickness (DCS). A trial was performed to assess the relative risks of oxygen and nitrogen in human no-decompression dives. 477 controlled wet working dives were performed with subjects breathing mixtures with low' (near .21 ATA) or high (1.0-1.5 ATA) oxygen partial pressures. Dives were 30, 60, or 240 minute in duration to various depths chosen by a sequential dose-response format. Only 11 cases of DCS and 17 cases of marginal symptoms ("niggles") were recorded despite exceeding the present no-decompression limits'by more than 20%. Analysis by maximum likelihood showed a shallow dose-response curve for increasing depth rather than a threshold separating safe and unsafe dives. Oxygen was less than 25% as potent as nitrogen in producing a risk of DCS, thus supporting the assumption of no 02 effect used in the Equivalent Air Depth calculations. Supported by Naval Medical Research and Development Command Task 637l3N-M00990lA.005. (UHMS Spon: AL Harabin)
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held May 26-30, 1987. The Hyatt Regency Hotel, Baltimore, Maryland (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/5587
Date: 1987

Files in this item

Files Size Format View
abstract.txt 259bytes Text file View/Open

This item appears in the following Collection(s)

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

Show full item record

Browse

My Account