Document Detail


Cardiovascular effects of whole-body heating in spontaneously hypertensive rats.
MedLine Citation:
PMID:  711567     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The cardiovascular response to severe whole-body heating was examined in anesthetized spontaneously hypertensive (SH) (mean BP = 140 Torr) and normotensive (N) rats (mean BP = 96 Torr). Elevation of colonic temperature to 44 degrees C resulted in an initial increase in arterial pressure (mean BP: SH = 199 Torr, N = 124 Torr) with a subsequent severe hypotension. There was little evidence to suggest that this collapse in systemic pressure was related to a direct heat impairment of cardiac function. It was more likely the result of a progressive venodilation which produced venous pooling and decreased venous return. The arterial blood pressure response to exogenous catecholamine challenge decreased at elevated temperatures. This suggests that there was a deterioration of the vasoconstrictor response and indicated a possible effect of heat at the receptor or effector level. There were significant differences between the responses of normotensive and hypertensive rats to whole-body heating suggesting an enhanced cardiovascular sensitivity in hypertensive rats that may partially explain earlier reports of inferior thermoregulation and heat intolerance in these animals.
Authors:
G Wright; E Knecht; M Toraason
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of applied physiology: respiratory, environmental and exercise physiology     Volume:  45     ISSN:  0161-7567     ISO Abbreviation:  J Appl Physiol Respir Environ Exerc Physiol     Publication Date:  1978 Oct 
Date Detail:
Created Date:  1979-01-24     Completed Date:  1979-01-24     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:  521-7     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure* / drug effects
Body Temperature Regulation
Epinephrine / pharmacology
Hot Temperature*
Hypertension / genetics,  physiopathology*
Lung / physiology
Male
Norepinephrine / pharmacology
Rats
Tidal Volume
Chemical
Reg. No./Substance:
51-41-2/Norepinephrine; 51-43-4/Epinephrine

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


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