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