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Circulation, Vol 52, 642-650, Copyright © 1975 by American Heart Association

ARTICLES

The echocardiographic assessment of pulmonary artery pressure and pulmonary vascular resistance

S Hirschfeld, R Meyer, DC Schwartz, J Kofhagen and S Kaplan

Serial assessment of the status of the pulmonary vascular bed requires bed requires cardiac catheterization. We have demonstrated the right ventricular systolic time intervals (RVSTI) may be measured from the pulmonary valve echo. The right ventricular ejection time (RVET) and right pre-ejection period (RPEP) were measured in 45 normal patients. The RVET and RPEP decreased with increasing heart rate but increased with age. The RPEP/RVET, however, was uninfluenced by either age or heart rate. The RPEP/RVET was, therefore, determined from the pulmonary valve echo in 64 patients with congenital heart disease who underwent cardiac catheterization. Increased pulmonary artery diastolic pressure (PADP), pulmonary vascular resistance (PADP), pulmonary vascular resistance (PVR) and mean pulmonary artery pressure (MPAP) resulted inan increased RPEP/RVET. The use of the RPEP/RVET permitted the serial echographic evaluation of the pulmonary vascular bed in selected patients; marked elevation of the ratio indicated the presence of pulmonary hypertension.

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