sixty-nine children with down syndrome ( mongolism , trisomy 21 ) , with atrial septal defect , patent ductus arteriosus , ventricular septal defect , or endocardial cushion defects , and 315 children with similar cardiac anomalies without this syndrome underwent cardiac catheterization during an 8-year period from 1964 to 1973 .
C0013274
patent ductus arteriosus
C0018798
cardiac anomalies