Document Detail


Arteriolar changes in developing and chronic stages of two-kidney, one clip hypertension.
MedLine Citation:
PMID:  2737736     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Arteriolar internal and external diameters in the cremaster muscle of two-kidney, one clip hypertensive rats (2K1C) were measured in vivo with video microscopy, both before and after the topical application of adenosine (10(-4) M). Arteriolar density was determined by stereologic techniques. Mean arterial blood pressure was significantly elevated in the 2K1C rats, rising to 186 +/- 6 mm Hg by 8 weeks compared with 113 +/- 4 mm Hg in controls. Lumens of larger arterioles showed a structural reduction at 2 weeks of hypertension and remained at the same level through 8 weeks, while arterioles of control rats showed a progressive increase in diameter with age (101 +/- 6 microns in 2K1C vs. 158 +/- 8 microns in controls at 8 weeks after operation). Wall-to-lumen ratios of larger arterioles were significantly increased at 2, 4, and 8 weeks of hypertension, but cross-sectional wall area was significantly reduced at 8 weeks. Medial hypertrophy was not evident at any stage of hypertension. Arteriolar rarefaction of smaller arterioles was functional at 2 weeks and structural at 8 weeks of hypertension. Vascular tone of the smaller arterioles was elevated in the developing and chronic stages of hypertension. At 2 weeks of hypertension when the structural reduction in diameters of larger arterioles was progressing, the increased vasoconstriction and functional rarefaction may have contributed to the elevated resistance. At 8 weeks, the marked diameter reductions of larger arterioles (36% in first-order arterioles and 25% in second-order arterioles) account for most of the increased resistance to flow.
Authors:
Z Ono; R L Prewitt; D L Stacy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Hypertension     Volume:  14     ISSN:  0194-911X     ISO Abbreviation:  Hypertension     Publication Date:  1989 Jul 
Date Detail:
Created Date:  1989-08-10     Completed Date:  1989-08-10     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7906255     Medline TA:  Hypertension     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  36-43     Citation Subset:  IM    
Affiliation:
Department of Physiology, Eastern Virginia Medical School, Norfolk 23501.
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MeSH Terms
Descriptor/Qualifier:
Abdomen / blood supply
Animals
Arteries / physiopathology*
Arterioles / physiopathology*
Chronic Disease
Hypertension, Renovascular / etiology,  physiopathology*
Male
Muscle Tonus
Muscle, Smooth, Vascular / physiopathology
Rats
Rats, Inbred Strains
Time Factors
Grant Support
ID/Acronym/Agency:
HL-36448/HL/NHLBI NIH HHS; HL-36551/HL/NHLBI NIH HHS

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


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