Document Detail


Age-related changes of the mechanical properties of the carotid artery in spontaneously hypertensive rats.
MedLine Citation:
PMID:  9431847     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: We had previously demonstrated that the distensibility of the carotid artery in spontaneously hypertensive rats (SHR) aged 18 weeks does not differ from that of the carotid artery in normotensive animals for common pressure levels, despite vascular hypertrophy in SHR. OBJECTIVE: To examine the time-course effects of hypertension on the geometry and the mechanical properties of the carotid artery in SHR. METHODS: The mechanical behavior of the carotid arteries of anesthetized SHR, stroke-prone SHR (SHRSP), and Wistar-Kyoto (WKY) rats aged 4, 8, 12, 16, and 32 weeks was examined by simultaneously measuring the internal diameter with an A-mode ultrasonic echo-tracking device and the intra-arterial pressure with a computerized data-acquisition system. Histometric measurements of the carotid artery were performed after death of rats. RESULTS: Blood pressure increased with time in rats of the two genetic hypertensive models. However, it rose earlier and to higher levels in the SHRSP. Cardiac hypertrophy was comparable in the two hypertensive groups whereas vascular hypertrophy was less pronounced in the SHRSP than it was in the SHR. There was an age-related decrease in arterial distensibility in rats of all groups that was more pronounced in the SHRSP than it was in the SHR compared with that in WKY rats (decreases of 57 and 36%, respectively, versus WKY rats aged 32 weeks; P < 0.05). For rats of all ages studied, although aging affected differently the vascular properties of the distinct animal strains, arterial distensibility was increased in the SHR and SHRSP compared with that in control animals for similar blood pressure levels, implying a rightward shift of the distensibility-pressure curves in the two hypertensive models. However, there was a significant reduction in arterial distensibility in rats of the two hypertensive strains at their respective mean blood pressures, compared with that in control animals.
Authors:
A Zanchi; H R Brunner; D Hayoz
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of hypertension     Volume:  15     ISSN:  0263-6352     ISO Abbreviation:  J. Hypertens.     Publication Date:  1997 Dec 
Date Detail:
Created Date:  1998-02-20     Completed Date:  1998-02-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8306882     Medline TA:  J Hypertens     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1415-22     Citation Subset:  IM    
Affiliation:
Division of Hypertension and Vascular Medicine, University Hospital, Lausanne, Switzerland.
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MeSH Terms
Descriptor/Qualifier:
Aging / physiology*
Animals
Blood Pressure / physiology
Carotid Arteries / pathology,  physiopathology*
Cerebrovascular Disorders / genetics
Compliance
Genetic Predisposition to Disease
Hypertension / pathology,  physiopathology*
Rats
Rats, Inbred SHR / genetics,  physiology*
Rats, Inbred WKY
Reference Values

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


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