echocardiography: congenital defect shunt flow left ventricle to right atrium bidirectional
echocardiography: congenital defect shunt flow left ventricle to right atrium bidirectional
echocardiography: congenital defect shunt flow left ventricle to right atrium bidirectional (procedure)
echocardiography: congenital defect shunt flow left ventricle to right atrium bidirectional (procedure)