Document Detail


Regional coronary blood flow at rest and during high sustained +Gz in a miniature swine with subclinical, ischemic, coronary heart disease due to coronary stenosis.
MedLine Citation:
PMID:  718574     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
New-generation high-performance aircraft can produce levels of high sustained +Gz which may exceed man's physiological capacity to withstand such stress. The severity of this stress has led to concern that sudden incapacitation due to coronary heart disease could occur during sustained +Gz. This report presents results obtained from an apparently asymptomatic miniature swine with a severe stenosis of the left anterior descending branch of the left coronary artery. Regional coronary blood flow was measured with the radiolabeled microsphere technique using 9 +/- 0.8 microgram diameter microspheres. Under resting conditions, myocardial blood flow was marginally depressed in the areas distal to the coronary stenosis. When the animal was exposed to +7 Gz, a large portion of the heart became acutely ischemic due to a redistribution of coronary blood flow. After 49 x of exposure to +7 Gz, the animal developed fatal ventricular fibrillation. Histologically, the areas of myocardium supplied by the stenosed vessel showed a variety of ischemia-induced lesions, including infarction and patchy myocardial fibrosis.
Authors:
M H Laughlin; W M Witt; J W Burns; J T Young
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  49     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  1978 Nov 
Date Detail:
Created Date:  1979-01-26     Completed Date:  1979-01-26     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1308-13     Citation Subset:  IM; S    
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MeSH Terms
Descriptor/Qualifier:
Animals
Constriction, Pathologic / pathology,  physiopathology
Coronary Circulation*
Coronary Disease / pathology,  physiopathology*
Female
Gravitation*
Hemodynamics
Myocardium / pathology
Rest
Swine

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


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