echocardiography: systolic time-velocity integral (TVI) of superior vena cava at end of inspiration
echocardiography: systolic time-velocity integral (tvi) of superior vena cava at end of inspiration
echocardiography: systolic time-velocity integral (TVI) of superior vena cava at end of inspiration
echocardiography: systolic time-velocity integral (tvi) of superior vena cava at end of inspiration