Document Detail


Renal hypertensive hypertrophy in the rat: a substrate for arrhythmogenicity.
MedLine Citation:
PMID:  3718425     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We investigated the ability of ouabain to produce lethal arrhythmias in rats with myocardial hypertrophy resulting from chronic renal hypertension. A gradual pressure overload was produced in female Wistar rats by left renal artery stenosis (two kidney, one clip, Goldblatt hypertension). Hypertension (systolic blood pressure greater than 150 mm Hg) developed within three weeks after clipping of the left renal artery and blood pressure continued to increase for the next five weeks. At ten weeks after the onset of hypertension animals were anesthetized with sodium pentobarbital (40 mg/kg) and artificially ventilated with room air while ECG was continually monitored and recorded. Continuous infusion of ouabain was maintained (0.7 mg/kg/min) through the inferior vena cava. Body weight and heart rate of control animals (C) was not significantly different from hypertensive (H) values, while systolic blood pressure in animals hypertensive for ten weeks was considerably greater (187 +/- 8.4 mm Hg) than their age-matched normotensive counterparts (123 +/- 6.0 mm Hg). Heart weight in hypertensive animals was elevated by 69% +/- 2.5 by time of study. Serological evaluation of both groups of animals revealed no significant differences in electrolytes and blood gases while significant differences were noted in glucose, BUN and creatinine. The average time to the first premature ventricular contraction was significantly shorter in H animals (3.5 +/- 0.2 min) when compared to C rats (6.0 +/- 0.2 min). The average time to ventricular tachycardia, ventricular fibrillation and death were also significantly shorter in H rats when compared to C animals (7.5 +/- 0.6 vs. 13.5 +/- 0.3; 13.5 +/- 0.5 vs. 21.0 +/- 0.5; 15.6 +/- 0.4 vs. 24.0 +/- 0.6 min). Thus, the hypertensive hypertrophied myocardium displays an increased propensity for lethal cardiac arrhythmias due to ouabain.
Authors:
J M Capasso; D Tepper; P Reichman; E H Sonnenblick
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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:  Basic research in cardiology     Volume:  81     ISSN:  0300-8428     ISO Abbreviation:  Basic Res. Cardiol.     Publication Date:    1986 Jan-Feb
Date Detail:
Created Date:  1986-06-27     Completed Date:  1986-06-27     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0360342     Medline TA:  Basic Res Cardiol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  10-9     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Arrhythmias, Cardiac / chemically induced,  physiopathology*
Blood Urea Nitrogen
Cardiomyopathy, Hypertrophic / physiopathology*
Electrocardiography
Electrolytes / blood
Female
Heart Ventricles / physiopathology
Hemodynamics / drug effects
Hypertension, Renovascular / physiopathology*
Ouabain / pharmacology
Rats
Rats, Inbred Strains
Grant Support
ID/Acronym/Agency:
HL 029884-9/HL/NHLBI NIH HHS; HL 19903-5/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Electrolytes; 630-60-4/Ouabain

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


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