Document Detail


The Valsalva maneuver as an indirect, non-invasive indicator of central blood volume shift.
MedLine Citation:
PMID:  3390099     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Our objective was to determine whether the Valsalva maneuver may be used as an indicator of fluid shift during spaceflights. The subjects, 21 healthy young men, conducted the maneuver against expiratory pressures of 20, 30, and 40 mm Hg, each lasting 30 s, at body positions of vertical, horizontal, and 6 degrees head down tilt (HDT). Heart rate was continuously recorded on a beat by beat basis together with the expiratory pressure. The increase in heart rate at equal intrathoracic pressures was maximal in the vertical position, significantly lower (p less than 0.001) in the horizontal position and lowest (p less than 0.05) in the 6 degrees HDT position. Obviously, the blood volume shift in the horizontal and 6 degrees HDT position partly compensated the impaired venous return during the Valsalva maneuver. This simple and non-invasive technique might be used to indicate the time course of blood volume shift during the initial stage of an orbital flight.
Authors:
J Stegemann; F M Baer; U Hoffman
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  59     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  1988 May 
Date Detail:
Created Date:  1988-07-29     Completed Date:  1988-07-29     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  422-7     Citation Subset:  IM; S    
Affiliation:
Physiologisches Institut der Deutschen Sporthochschule, Köln, Federal Republic of Germany.
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Volume*
Cardiac Output*
Heart Rate*
Humans
Male
Posture
Respiration
Space Flight*
Valsalva Maneuver*

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


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