(Circulation. 1995;92:2306-2317.)
© 1995 American Heart Association, Inc.
Articles |
The Cellular Basis of Pacing-Induced Dilated Cardiomyopathy
Myocyte Cell Loss and Myocyte Cellular Reactive Hypertrophy
From the Departments of Medicine and Physiology, New York Medical College, Valhalla, NY.
Correspondence to Piero Anversa, MD, Department of Medicine, Vosburgh Pavilion, Room 302, New York Medical College, Valhalla, NY 10595.
Background Rapid ventricular pacing leads to a cardiac myopathy consisting of an increase in chamber dimension, mural thinning, elevation in ventricular wall stress, and congestive heart failure, mimicking dilated cardiomyopathy in humans. However, contrasting results have been obtained concerning the mechanisms of ventricular dilation and the existence of myocardial hypertrophy. Moreover, questions have been raised regarding the occurrence of myocardial damage and cell loss in the development of the experimental myopathy.
Methods and Results The functional and structural characteristics of the heart were studied in conscious dogs subjected to left ventricular pacing at 210 beats per minute for 3 weeks and 240 beats per minute for an additional week. At the time the animals were killed, measurements of myocardial structural integrity and myocyte shape, size, and number were determined by morphometric analysis of the myocardium in situ and enzymatically dissociated cells. The experimental protocol used was associated with overt cardiac failure documented by an increase in left ventricular end-diastolic pressure and a decrease in left ventricular systolic pressure and +dP/dt in combination with tachycardia, ascites, and pulmonary congestion. Although cardiac weights were not altered, cavitary diameter was increased and wall thickness was decreased from the base to the apex of the heart. Multiple foci of replacement fibrosis, comprising 6% of the myocardium, were detected across the left ventricular wall. Measurements of myocyte size and number documented a 39% loss of cells in the entire ventricle and a 61% increase in volume of the remaining viable myocytes. Myocyte hypertrophy was characterized by a 33% increase in cell length and a 23% increase in transverse area, resulting in a 23% increase in the cell length–to–cell diameter ratio. Pacing did not alter the relative proportion of mononucleated, binucleated, and multinucleated myocytes in the myocardium.
Conclusions Myocyte cell loss and myocyte reactive hypertrophy are the major components of ventricular remodeling in pacing-induced dilated cardiomyopathy.
Key Words: ventricles • myocytes • myocardium • pacing
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