echocardiography: systolic time-velocity integral (TVI) of left ventricular outflow tract at end of expiration
echocardiography: systolic time-velocity integral (tvi) of left ventricular outflow tract at end of expiration
echocardiography: systolic time-velocity integral (TVI) of left ventricular outflow tract at end of expiration (procedure)
echocardiography: systolic time-velocity integral (tvi) of left ventricular outflow tract at end of expiration (procedure)