[abstract] PULMONARY FUNCTIONS DURING HYDROGEN-OXYGEN BREATHING AT PRESSURE EQUIVALENT TO 200 FEET OF SEA WATER.

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[abstract] PULMONARY FUNCTIONS DURING HYDROGEN-OXYGEN BREATHING AT PRESSURE EQUIVALENT TO 200 FEET OF SEA WATER.

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Title: [abstract] PULMONARY FUNCTIONS DURING HYDROGEN-OXYGEN BREATHING AT PRESSURE EQUIVALENT TO 200 FEET OF SEA WATER.
Author: Dougherty Jr, JH
Abstract: Forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1),forced expiratory volume in 2 seconds (FEV1), maximal expiratory flow rate (MEFR), maximal inspiratory flow rate (MIFR), and maximum voluntary ventilation (MVV) were mea-sured on four subjects breathing 97% hydrogen - 3% oxygen (H202) 200 feet, on two subjects breathing 97% helium - 3% at oxygen (He-02), and on two dives using 97% nitrogen -3% oxygen (N2-02). MVV on H2-O2 at 200 feet was 16% better than on air at the surface and was improved 32% compared with He-O2 and 152% when compared with N2-O2 at 200 feet. Similar findings were obtained for the following functions: FEVl, FEV2, MEFR, and MIFR. H2-O2 has only rarely been used by man as a breathing medium; pulmonary function tests have never previously been performed while breathing this mixture. The 97% - 3% H2-O2 is much lighter than any other gas mixture used as a "breathing medium by man. This decreased density reduces the work of breathing and the respiratory limitations on moderate work at these 200 foot depths, and the limitation on even light work at much greater depths between 1000-5000 feet on He-02. The literature contains conflicting views on just where the respiratory limit for work and/or survival lies. In any case, one must conclude that ultimately there is a respiratory limit at some depth and some work load and that for a given depth a greater ventilation is possible with a less dense gas during extreme exertion and/or emergency situations.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held May 10-11, 1974. Hilton Hotel, Washington, D.C. (http:www.uhms.org)
URI: http://archive.rubicon-foundation.org/50
Date: 1974

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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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