echocardiography: atrial reversal time-velocity integral (TVI) of superior vena cava at rest
echocardiography: atrial reversal time-velocity integral (tvi) of superior vena cava at rest
echocardiography: atrial reversal time-velocity integral (TVI) of superior vena cava at rest (procedure)
echocardiography: atrial reversal time-velocity integral (tvi) of superior vena cava at rest (procedure)