Table 1. Types of congenital heart defects in patients with Down syndrome.
| CHD feature, n (%) | |
| Type of CHD | (n = 186) |
| Atrioventricular septal defect (AVSD) | 54 (29) |
| Complete AVSD | 46/54 (85) |
| • Rastelli type A | 12/54 (26) |
| • Rastelli type B | 0 |
| • Rastelli type C | 34/54 (74) |
| • Balanced | 45/54 (98) |
| • Unbalanced | 1/54 (2) |
| Partial AVSD | 1 (1.9) |
| Intermediate AVSD | 7 (12.9) |
| Ventricular septal defect (VSD) | 40 (21.5) |
| Perimembranous | 28/40 (70) |
| Subpulmonary | 4/40 (10) |
| Muscular | 4/40 (10) |
| Inlet | 4/40 (10) |
| Atrial septal defect (ASD) | 37 (19.9) |
| Ostium secundum | 35/37 (95) |
| Sinus venosus | 2/37 (5) |
| Patent ductus arteriosus (PDA) | 31 (16.7) |
| Tetralogy of Fallot (FT) | 10 (5.4) |
| Valvular disease | 6 (3.2) |
| Mitral valvular insufficiency | 5/6 (83) |
| Aorticvalvular insufficiency | 1/6 (17) |
| Other | 8 (4.3) |
| Left superior vena cava | 3/8 (37) |
| Pulmonary stenosis | 2/8 (25) |
| Coartaction of the aorta | 1/8 (12) |
| PAPVC | 1/8 (12) |
| Double outlet right ventricle | 1/8 (12) |
PAPVC: partial anomalous pulmonary venous connection.