echocardiography: peak atrial reversal velocity of superior vena cava at end of expiration
echocardiography: peak atrial reversal velocity of superior vena cava at end of expiration
echocardiography: peak atrial reversal velocity of superior vena cava at end of expiration (procedure)
echocardiography: peak atrial reversal velocity of superior vena cava at end of expiration (procedure)