echocardiography: systolic time-velocity integral (TVI) of right ventricular outflow tract
echocardiography: systolic time-velocity integral (tvi) of right ventricular outflow tract
echocardiography: systolic time-velocity integral (TVI) of right ventricular outflow tract (procedure)
echocardiography: systolic time-velocity integral (tvi) of right ventricular outflow tract (procedure)