echocardiography: congenital defect shunt flow at atrial level velocity at end of expiration
echocardiography: congenital defect shunt flow at atrial level velocity at end of expiration
echocardiography: congenital defect shunt flow at atrial level velocity at end of expiration (procedure)
echocardiography: congenital defect shunt flow at atrial level velocity at end of expiration (procedure)