Document Detail


Hemodynamic effects of anti-G suit inflation in a 1-G environment.
MedLine Citation:
PMID:  4055594     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study evaluated effects of various anti-G inflation pressures on cardiac volumes and the relationship of these volume changes to mean arterial pressure changes. Ventricular volumes were calculated using two-dimensional echocardiography. An anti-G suit was inflated to 2, 4, and 6 psi in the standing and supine positions for 10 male subjects. In the supine position, mean arterial pressure increased from base line for all three inflation pressures (P = 0.05). The end-diastolic volume increased after 2-psi inflation (P = 0.03). Cardiac output or stroke volume did not change. After standing, mean arterial pressure (P = 0.002), end-diastolic volume (P = 0.002), and stroke volume (P = 0.05) fell after suit deflation. Peripheral vascular resistance fell in the 2- and 4-psi inflation profiles. In the standing protocol, mean arterial pressure, end-diastolic volume, stroke volume, and cardiac output rose with all three inflation pressures (P less than 0.05). After reclining, heart rate increased (P = 0.02) and mean arterial pressure fell (P less than 0.05) in the 4- and 6-psi inflation profiles after suit deflation. Increases in mean arterial pressure are caused by increases in cardiac preload and cardiac output after inflation of the anti-G suit while subjects were standing. Increased cardiac preload was not consistently seen after inflation while subjects were supine. Changes in end-diastolic volume and mean arterial pressure were dependent on the pressure used to inflate the anti-G suit.
Authors:
J F Seaworth; T J Jennings; L L Howell; J W Frazier; C D Goodyear; E D Grassman
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  59     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1985 Oct 
Date Detail:
Created Date:  1985-12-19     Completed Date:  1985-12-19     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1145-51     Citation Subset:  IM; S    
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Pressure*
Cardiac Output*
Cardiac Volume*
Echocardiography / methods
Gravitation*
Gravity Suits*
Heart Rate
Humans
Male
Posture
Stroke Volume
Vascular Resistance

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


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