Document Detail

Effects of beta-blocker on left ventricular remodeling in rats with volume overload cardiac failure.
MedLine Citation:
PMID:  19057143     Owner:  NLM     Status:  MEDLINE    
The beneficial effects of beta-blockers on left ventricular (LV) remodeling have been reported in association with several conditions that cause heart failure, but their effects on the volume overloaded heart failure have not been well defined. Fifty Wistar rats that survived aortocaval (AC) shunt creation were randomly allotted into the following two groups: untreated animals (ACS; n=26) and animals treated with 100 mg/kg/day metoprolol (MP; ACS+MP; n=24). The effects of MP were evaluated at 1, 4 and 12 weeks post-surgery through echocardiographic, hemodynamic and pathologic studies. At 12 weeks post-surgery, LV wall thinning associated with chamber dilatation was observed in ACS but not in ACS+MP. LV end-diastolic pressure and diastolic wall stress were lower in ACS+MP than in ACS. The increase in LV weight was similar in both ACS and ACS+MP at 1 and 4 weeks post-surgery, but at 12 weeks post-surgery, it was significantly greater in ACS+MP than in ACS. At the cellular level, although the cardiac myocyte length progressively increased to a similar extent in both groups, the mean cross-sectional diameter of these cells in ACS+MP was greater than in ACS. In conclusion, MP did not prevent early eccentric hypertrophy in response to volume overload. However, in the late phase of volume overload-induced heart failure, MP appears to allow for myocyte cross-sectional growth and thus prevents LV wall thinning, resulting in a net increase in LV mass. In this manner, MP might contribute to reduction of diastolic wall stress and thereby delay progression of heart failure.
Masayuki Kobayashi; Noboru Machida; Ryou Tanaka; Yoshihisa Yamane
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of veterinary medical science / the Japanese Society of Veterinary Science     Volume:  70     ISSN:  0916-7250     ISO Abbreviation:  J. Vet. Med. Sci.     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-12-05     Completed Date:  2008-12-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9105360     Medline TA:  J Vet Med Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  1231-7     Citation Subset:  IM    
Department of Veterinary Clinical Oncology, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo, Japan.
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MeSH Terms
Adrenergic beta-Antagonists / therapeutic use*
Echocardiography, Transesophageal
Heart Bypass, Right
Heart Failure / prevention & control*,  surgery
Heart Ventricles / drug effects*
Hemodynamics / drug effects,  physiology
Metoprolol / therapeutic use
Muscle Cells / drug effects,  physiology
Ventricular Dysfunction, Left / prevention & control,  surgery
Ventricular Function, Left / drug effects,  physiology
Reg. No./Substance:
0/Adrenergic beta-Antagonists; 37350-58-6/Metoprolol

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