Document Detail


Lung volumes in man immersed to the neck: dilution and plethysmographic techniques.
MedLine Citation:
PMID:  649469     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Previous studies of lung volumes during immersion have utilized dilution techniques for residual volume. We have compared lung volumes obtained by the use of a dual inert gas dilution technique with those determined by the Boyle's law technique in a plethysmograph designed to allow measurements in air and submersed to the neck in water. Both techniques gave similar results dry, but during immersion the dilution residual volume (RV) was 0.200 liter (16%) lower than the plethysmographic value (P greater than 0.001), which suggests that there is a significant amount of gas trapping during immersion due to breathing at low lung volumes and the central shift of blood. The unchanged RV due to hydrostatic force on the chest wall is balanced by the tendency to increase RV due to vascular congestion, which increases closing volume and stiffens the lung to compression.
Authors:
C H Robertson; C M Engle; M E Bradley
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  44     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1978 May 
Date Detail:
Created Date:  1978-07-15     Completed Date:  1978-07-15     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  7801242     Medline TA:  J Appl Physiol Respir Environ Exerc Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  679-82     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Expiratory Reserve Volume
Functional Residual Capacity
Humans
Immersion*
Inspiratory Reserve Volume
Lung Volume Measurements / methods*
Male
Neck
Plethysmography*
Residual Volume
Tidal Volume
Total Lung Capacity

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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