factors which adversely affected the surgical outcome were : ( 1 ) a critically ill infant , ( 2 ) small left atrium and left ventricle , ( 3 ) a patent foramen ovale rather than atrial septal defect , ( 4 ) systemic arterial oxygen saturation less than 70 per cent , and ( 5 ) pulmonary arterial pressure in excess of systemic arterial pressure .
C0016522
patent foramen ovale
C0018817
atrial septal defect