VENTILATORY DYNAMICS UNDER HYPERBARIC STATES

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Title: VENTILATORY DYNAMICS UNDER HYPERBARIC STATES
Author: Wood, WB; Leve, LH; Workman, RD
Abstract: Eleven U. S. Navy divers performed comparative dynamic pulmonary function tests under conditions of increasing density of the respiratory media. Variations in density and viscosity were produced by having the subjects breath air and heliumoxygen mixes in alternate studies while being subjected successively to 1 through 15 atmospheres absolute pressure. Substitution of 95% helium-5% oxygen at 15 atm. abs. produced significantly less variation from normal in all parameters measured. Mean figures were 76.8% of predicted MBC, 70.9% first second TVC, and an MEF of 281 LPM. The increased work of breathing accompanying increased density of the respiratory media probably accounts for the relative decrease in RMV previously observed in underwater swimmers. Helium-oxygen mixtures provide a more ideal respiratory media than nitrogen-oxygen mixtures for marked hyperbaric conditions, especially under circumstances requiring high flow rates and large respiratory minute volumes. (Author)
Description: Citation Status: Active; Citation Classification: Unclassified; Title Classification: Unclassified; Report Classification: Unclassified; Identifier Classification: Unclassified; Abstract Classification: Unclassified; Distribution Limitation(s): 01 - APPROVED FOR PUBLIC RELEASE; Information provided by the Department of Defense and the Defense Technical Information Center (http://www.dtic.mil/) is considered public information and may be distributed or copied unless otherwise specified. Use of appropriate byline/photo/image credits is requested. ST-A NEDU LTR, 28 JAN 66
URI: http://archive.rubicon-foundation.org/3856
Date: 1962

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