Document Detail


The heart in heart failure. Ventricular and myocardial alterations.
MedLine Citation:
PMID:  1833195     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In heart failure, many alterations occur in the ventricle as a whole, as well as in the myocardial cell. In the first part of this review we report on the macroscopic structure of the left ventricle by analysing the relation between left ventricular dilatation and left ventricular hypertrophy in terms of ventricular wall stress. Peak systolic stress in dilated ventricles of patients with compensated heart failure does not differ from values obtained in normal ventricles, whereas the systolic stress-time integral is increased by more than 40%. The stress-time integral is a major determinant of myocardial oxygen consumption, and its reduction by peripheral vasodilation leads to a proportional decrease in left ventricular oxygen consumption. In contrast, the phosphodiesterase inhibitor, enoximone, decreases the stress-time integral without a proportional decrease in myocardial oxygen consumption, due to the competition between positive inotropic effect with increased oxygen consumption and a vasodilating effect with decreased oxygen consumption. Beta-1 adrenoceptor agonists increase myocardial oxygen consumption. In the second part of this review we report on the functional alterations of the following subcellular and molecular structures in the failing myocardium: (1) adrenoceptors and G-proteins; (2) sarcoplasmic reticulum with an altered force-frequency relationship; (3) the acto-myosin system with decreased velocity of shortening and increased economy of force generation. On the basis of these alterations, a disadvantageous chain of events develops in the failing myocardial cell.
Authors:
C Holubarsch; G Hasenfuss; L Thierfelder; B Pieske; H Just
Related Documents :
3396175 - Failure of epinephrine to improve the balance between myocardial oxygen supply and dema...
20675545 - Roles of nitric oxide, nitrite and myoglobin on myocardial efficiency in trout (oncorhy...
2364535 - Methemoglobinemia from topical benzocaine.
2909305 - Oxygen consumption and coronary reactivity in postischemic myocardium.
1182955 - Correlation between echocardiographically demonstrated segmental dyskinesis and regiona...
15298035 - Spontaneous coronary artery dissection.
Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  European heart journal     Volume:  12 Suppl C     ISSN:  0195-668X     ISO Abbreviation:  Eur. Heart J.     Publication Date:  1991 Aug 
Date Detail:
Created Date:  1991-11-07     Completed Date:  1991-11-07     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8006263     Medline TA:  Eur Heart J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  8-13     Citation Subset:  IM    
Affiliation:
Department of Cardiology, Internal Medicine, Freiburg, Germany.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Cardiomegaly / physiopathology
Heart / physiopathology*
Heart Failure / physiopathology*
Humans
Myocardial Contraction / physiology
Myocardium / metabolism*
Ventricular Function, Left / physiology

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


Previous Document:  Pressure effects on the binding of vanadate to the sarcoplasmic reticulum calcium-transport enzyme.
Next Document:  Effect of mediators on coronary circulation.