echocardiography: diastolic time-velocity integral (TVI) of superior vena cava with stress
echocardiography: diastolic time-velocity integral (tvi) of superior vena cava with stress
echocardiography: diastolic time-velocity integral (TVI) of superior vena cava with stress (procedure)
echocardiography: diastolic time-velocity integral (tvi) of superior vena cava with stress (procedure)