Document Detail

Physiological considerations concerning positive pressure breathing (PBG) during +Gz.
MedLine Citation:
PMID:  11538504     Owner:  NASA     Status:  MEDLINE    
The ability to tolerate +Gz radial acceleration depends primarily on the maintenance of sufficient head level arterial pressure and cerebral blood flow to prevent the occurrence of blackout and G-induced loss of consciousness (G-LOC). Because of the hydrostatic effect on the heart-to-head blood column during +Gz acceleration, if exposures to higher +Gz levels are to be tolerated, either the column must be shortened or arterial pressure at heart level must be elevated. This paper is an overview of the effect and concomitant side effects of positive pressure breathing (PBG) as a means to increase arterial pressure at the heart, and, indirectly, at the cerebral level. However, before doing that, it is necessary to summarise the different ways for increasing arterial pressure to obtain tolerance to increasing +Gz loads.
J M Clere; G Ossard; F Melchior
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  The Physiologist     Volume:  36     ISSN:  0031-9376     ISO Abbreviation:  Physiologist     Publication Date:  1993 Feb 
Date Detail:
Created Date:  1996-05-28     Completed Date:  1996-05-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401143     Medline TA:  Physiologist     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  S102-5     Citation Subset:  S    
Laboratoire de Medecine Aerospatiale, Centre D'Essais en Vol, Bretigny-sur-Orge, France.
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MeSH Terms
Aerospace Medicine
Aviation / instrumentation
Blood Pressure / physiology
Gravity Suits*
Human Engineering
Hypergravity / adverse effects*
Positive-Pressure Respiration*
Syncope / etiology,  prevention & control*
Unconsciousness / etiology,  prevention & control

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