Fig. 1From: Left ventricular outflow tract velocity time integral outperforms ejection fraction and Doppler-derived cardiac output for predicting outcomes in a select advanced heart failure cohortLeft ventricular outflow tract stroke distance measured by pulsed wave Doppler echocardiography. Legend: Doppler signal from the apical view is directed parallel to flow through the left ventricular outflow tract and velocity time integral measured by hand planimetryBack to article page