Influence of collagen network on left ventricular systolic and diastolic function in aortic valve disease

Détails

ID Serval
serval:BIB_BDABAAF61B52
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Influence of collagen network on left ventricular systolic and diastolic function in aortic valve disease
Périodique
Journal of the American College of Cardiology
Auteur(s)
Villari  B., Campbell  S. E., Hess  O. M., Mall  G., Vassalli  G., Weber  K. T., Krayenbuehl  H. P.
ISSN
0735-1097 (Print)
Statut éditorial
Publié
Date de publication
11/1993
Volume
22
Numéro
5
Pages
1477-84
Notes
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Nov 1
Résumé
OBJECTIVES. The purpose of this study was to evaluate left ventricular structure-function interplay in aortic valve disease. BACKGROUND. An increase in myocardial fibrosis has been demonstrated in aortic valve disease, but changes in the collagen network and their effect on ventricular function have not been defined. METHODS. Left ventricular structure was assessed from left ventricular endomyocardial biopsy specimens obtained in 32 patients with aortic valve disease (aortic stenosis in 25, aortic regurgitation in 7). Total collagen volume fraction, orthogonal collagen fiber meshwork (cross-hatching), endocardial fibrosis, muscle fiber diameter and volume fraction of myofibrils were determined by morphologic-morphometric evaluation. Control biopsy data were obtained from six donor hearts before transplantation. Eleven other patients with normal left ventricular function served as hemodynamic status control subjects. Left ventricular biplane cineangiography and high fidelity pressure measurements were carried out in all patients. Systolic function was assessed from ejection fraction. Diastolic function was evaluated by the time constant of relaxation, early and late peak filling rates and the constant of passive myocardial stiffness. Patients were assigned to three groups according to increasing severity of nonmyocyte tissue alterations. Group 1 comprised 10 patients with elevated total collagen volume fraction. Group 2 comprised 6 patients with normal total collagen volume fraction and the presence of increased cross-hatching or endocardial fibrosis, or both. Group 3 comprised 16 patients with elevated total collagen volume fraction and the presence of cross-hatching or endocardial fibrosis, or both. RESULTS. Muscle fiber diameter was increased in the three groups with aortic valve disease, whereas the volume fraction of myofibrils was comparable in all four study groups. Ejection fraction was depressed in groups 2 and 3 compared with the control group. The time constant of relaxation was prolonged in the three groups with aortic valve disease. No differences in early and late peak filling rate were observed in the four study groups, but the constant of myocardial stiffness increased in groups 2 and 3. CONCLUSIONS. In aortic valve disease, changes in collagen architecture are associated with altered systolic function and passive diastolic properties. The sole increase in total collagen volume fraction without a change in architecture leaves systolic and passive diastolic function unaltered.
Mots-clé
Adult Aged Aortic Valve Insufficiency/complications/pathology/*physiopathology Aortic Valve Stenosis/complications/pathology/*physiopathology Biopsy Cineangiography Collagen/*analysis Endocardial Fibroelastosis/complications/pathology/*physiopathology Heart Catheterization Humans Hypertrophy, Left Ventricular/complications/pathology/*physiopathology Middle Aged *Myocardial Contraction Myofibrils/*chemistry Severity of Illness Index Stress, Mechanical Stroke Volume Time Factors Ventricular Function, Left/*physiology
Pubmed
Web of science
Open Access
Oui
Création de la notice
28/01/2008 11:32
Dernière modification de la notice
09/05/2019 0:34
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