Doppler echocardiographic demonstration of the differential effects of right ventricular pressure and volume overload on left ventricular geometry and filling

Section of Cardiology, Loyola University Medical Center, Maywood, Illinois 60153.

To compare the effects of isolated right ventricular pressure and volume overload on left ventricular diastolic geometry and filling, 11 patients with primary pulmonary hypertension, 11 patients with severe tricuspid regurgitation due to tricuspid valve resection and 11 normal subjects were studied with use of Doppler echocardiographic techniques. Right ventricular systolic overload in primary pulmonary hypertension resulted in substantial leftward ventricular septal shift that was most marked at end-systole and early diastole and decreased substantially by end-diastole. Right ventricular diastolic overload after tricuspid valve resection resulted in maximal leftward ventricular septal shift at end-diastole sparing end-systole and early diastole. The early diastolic distortion of left ventricular geometry associated with right ventricular pressure overload resulted in prolongation of isovolumetric relaxation of the left ventricle (129 +/- 39 ms) and a reduction in early diastolic filling compared with values in normal subjects. Late diastolic distortion of left ventricular geometry associated with right ventricular volume overload had no influence on the duration of left ventricular isovolumetric relaxation (52 +/- 32 ms) but caused a reduction in the atrial systolic contribution to late diastolic filling of the left ventricle compared with values in normal subjects. In patients with right ventricular pressure overload, 52 +/- 16% of left ventricular filling occurred in early diastole compared with 78 +/- 11% in patients with right ventricular volume overload (p less than 0.001). The differential effects of systolic and diastolic right ventricular overload on the pattern of left ventricular filling appear to be related to the timing of leftward ventricular septal displacement.

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