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Circulation, Vol 54, 83-91, Copyright © 1976 by American Heart Association

ARTICLES

Determinants of ventricular septal motion. Influence of relative right and left ventricular size

AS Pearlman, CE Clark, WL Henry, J Morganroth, SB Itscoitz and SE Epstein

To test the hypothesis that the ventricular septum moves during systole toward the center of the ventricular mass (so that the end-diastolic position of the septum within the heart should determine both the direction and the magnitude of septal motion during systole), echocardiograms from patients with several different hemodynamic burdens were analyzed. A linear relation was noted between the end- diastolic intracardiac position of the ventricular septum and the direction and magnitude of systolic septal motion in 1) forty three patients with an atrial septal defect )regression coefficient r = 0.80), 2) fourteen patients with other causes of right ventricular volume overload (r = 0.82), 3) nineteen patients with left ventricular volume overload (r = 0.74), 4) ten patients with right ventricular pressure overload (r = 0.93), 5) ten patients with left ventricular pressure overload (r = 0.80), 6) twenty-eight normal subjects (r = 0.82). We conclude that, in the presence of normal ventricular activation and contraction, the direction and magnitude of sepatal motion during systole is determined by the intracardiac position of the septum at enddiastole.

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