Document Detail

Left ventricular remodeling in preclinical experimental mitral regurgitation of dogs.
MedLine Citation:
PMID:  22386719     Owner:  NLM     Status:  Publisher    
Dogs with experimental mitral regurgitation (MR) provide insights into the left ventricular remodeling in preclinical MR. The early preclinical left ventricular (LV) changes after mitral regurgitation represent progressive dysfunctional remodeling, in that no compensatory response returns the functional stroke volume (SV) to normal even as total SV increases. The gradual disease progression leads to mitral annulus stretch and enlargement of the regurgitant orifice, further increasing the regurgitant volume. Remodeling with loss of collagen weave and extracellular matrix (ECM) is accompanied by stretching and hypertrophy of the cross-sectional area and length of the cardiomyocyte. Isolated ventricular cardiomyocytes demonstrate dysfunction based on decreased cell shortening and reduced intracellular calcium transients before chamber enlargement or decreases in contractility in the whole heart can be clinically appreciated. The genetic response to increased end-diastolic pressure is down-regulation of genes associated with support of the collagen and ECM and up-regulation of genes associated with matrix remodeling. Experiments have not demonstrated any beneficial effects on remodeling from treatments that decrease afterload via blocking the renin-angiotensin system (RAS). Beta-1 receptor blockade and chymase inhibition have altered the progression of the LV remodeling and have supported cardiomyocyte function. The geometry of the LV during the remodeling provides insight into the importance of regional differences in responses to wall stress.
A Ray Dillon; Louis J Dell'italia; Michael Tillson; Cheryl Killingsworth; Thomas Denney; John Hathcock; Logan Botzman
Related Documents :
11530109 - Coronary vasa vasorum neovascularization precedes epicardial endothelial dysfunction in...
20505799 - The effect of insulin on the heart: part 2: effects on function during and post myocard...
16027859 - The course of experimental myocardial infarction under conditions of suppressed and enh...
21954209 - Utility of fractional flow reserve to determine treatment after recent large myocardial...
6460499 - Histoenzymological study of myocardial atpase activity in experimental infarction in th...
25147639 - Primary cardiac sarcoma presenting as acute left-sided heart failure.
10073799 - Left ventricular versus biventricular dysfunction in idiopathic dilated cardiomyopathy.
17532959 - Results of a multicenter clinical trial with the thoratec implantable ventricular assis...
17357969 - Risk factor profile for sudden cardiac death during mountain hiking.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-1
Journal Detail:
Title:  Journal of veterinary cardiology : the official journal of the European Society of Veterinary Cardiology     Volume:  -     ISSN:  1875-0834     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101163270     Medline TA:  J Vet Cardiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier B.V.
College of Veterinary Medicine, Auburn University, Auburn, AL 36849, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

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

Previous Document:  Use of computed tomography and silicon endocasts to identify pulmonary veins with echocardiography.
Next Document:  Hemostatically distinct FFPs equally improve abnormal TEG variables in an in vitro dilutional coagul...