echocardiography: peak diastolic velocity (D2) of distal left pulmonary vein
echocardiography: peak diastolic velocity (d2) of distal left pulmonary vein
echocardiography: peak diastolic velocity (D2) of distal left pulmonary vein (procedure)
echocardiography: peak diastolic velocity (d2) of distal left pulmonary vein (procedure)