Static cardiomyoplasty with synthetic elastic net suppresses ventricular dilatation and dysfunction after myocardial infarction in the rat: a chronic study.

Abstract

Although static cardiomyoplasty prevents the left ventricle (LV) from dilatation, it may interfere with diastolic relaxation, or cause restriction. We developed a synthetic net with dual elasticity and tested its effect late after myocardial infarction in the rat. LV pressure-volume relationships (PVR) were successively analyzed before, after intravenous volume load, and 10 minutes after occlusion of the left anterior descending artery. Rats were then randomized into groups receiving synthetic net wrapping around the heart (NET+, n = 8) and only partially behind LV (NET-, n = 9), and they underwent the same PVR studies 6 weeks later. End-diastolic and end-systolic PVR were defined, and LV size and function were compared under standardized loading conditions. Although there was no difference in Day 0, increase in LV end-diastolic and end-systolic volumes were significantly attenuated in NET+ rats 6 weeks later when there was a significant correlation between LV volumes by PVR estimation and actual measurements, with significant differences in both measures between the groups: NET+ < NET-. The presence or absence of net did not show restrictive hemodynamics under acute volume load. Static cardiomyoplasty using a synthetic elastic net significantly attenuated LV dilatation and dysfunction without restriction late after myocardial infarction in the rat.

• Authors: Nobusuke Kato, Akira T Kawaguchi, Akio Kishida, Tetsuji Yamaoka
• Journal: Artificial organs (Artif Organs) Vol. 37 Issue 7 Pg. 593-9 (Jul 2013) ISSN: 1525-1594 [Electronic] United States
• PMID: 23461677 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Video-Audio Media)
• Copyright: © 2013, Copyright the Authors. Artificial Organs © 2013, International Center for Artificial Organs and Transplantation and Wiley Periodicals, Inc.

Topics

• Animals
• Cardiomyoplasty (instrumentation, methods)
• Dilatation, Pathologic
• Disease Models, Animal
• Elasticity
• Equipment Design
• Hemodynamics
• Hypertrophy, Left Ventricular (etiology, pathology, physiopathology, prevention & control)
• Male
• Myocardial Infarction (complications, pathology, physiopathology, surgery)
• Rats
• Rats, Sprague-Dawley
• Surgical Equipment
• Time Factors
• Ventricular Dysfunction, Left (etiology, pathology, physiopathology, prevention & control)
• Ventricular Function, Left
• Ventricular Pressure
• Ventricular Remodeling