echocardiography: systolic time-velocity integral (TVI) of distal left pulmonary vein
echocardiography: systolic time-velocity integral (tvi) of distal left pulmonary vein
echocardiography: systolic time-velocity integral (TVI) of distal left pulmonary vein
echocardiography: systolic time-velocity integral (tvi) of distal left pulmonary vein