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Accurate noninvasive estimation of pulmonary vascular resistance by Doppler echocardiography in patients with chronic heart failure

^a Division of Cardiology, "Salvatore Maugeri" Foundation, IRCCS, Medical Center of Rehabilitation, Veruno (NO), Italy

View larger version (44K): [in a new window]   Figure 1 Continuous-wave Doppler recording of tricuspid regurgitant flow (top) and pulsed-wave recording of pulmonary flow (bottom) in the same patient. AcT = acceleration time; EjT = ejection time; PEP = pre-ejection period.

View larger version (16K): [in a new window]   Figure 2 Scatterplot of linear correlation between measured and Doppler-determined pulmonary vascular resistance (PVR). Vertical dashed line marks the value of 2.6 in Doppler-determined PVR that predicts a value of 2.5 Wood in measured PVR (horizontal dashed line), above which PVR is commonly considered to be increased. AcT = acceleration time; PEP = pre-ejection period; TT = total systolic time, all of them on Doppler pulmonary flow.

View larger version (13K): [in a new window]   Figure 3 Scatterplots of Doppler-determined versus measured pulmonary vascular resistance (PVR) values both before (top) and after (bottom) unloading manipulations (nitroprusside infusion) in a group of patients (n = 15) with baseline elevated PVR. AcT = acceleration time; PEP = pre-ejection period; TT = total systolic time.