Demographics and preoperative anatomy
| Data | Study cohort (n=345), no (%) |
| Male | 229 (66.4) |
| Age at 1st assessment, median (range) | 1.9 (range 0.04–31.5) years |
| Age at last follow-up, median (range) | 12.2 (range 1.0–39.0) years |
| Morphological TGA subtype | |
| TGA-IVS | 230 (66.7) |
| TGA-VSD | 89 (25.8) |
| DORV-SP-VSD | 26 (7.5) |
| Coexisting findings | |
| Arch abnormality | 24 (7.0) |
| Bicuspid pulmonary valve | 21 (6.1) |
| Left ventricular OTO | 12 (3.5) |
| Coronary anatomy* | |
| Usual (1LCx-2R, 1L-2CxR) | 275 (79.7) |
| Other | 60 (17.4) |
| Intramural course of LAD | 4 (1.2) |
| Unknown | 6 (1.7) |
| Preoperative procedures | |
| Balloon atrial septostomy | 182 (52.8) |
| Previous PAB | 18 (5.2) |
| Arterial switch operation | |
| One-stage | 319 (92.5) |
| Median age (range) | 8 days (0 days – 0.6 years) |
| Two stage | 26 (7.5) |
| Median age (range) | 143 days (36 days–5.1 years) |
| Coronary artery transfer technique | |
| Double button | 197 (57.1) |
| Single trapdoor, single button | 96 (27.9) |
| Double trapdoor | 31 (9.0) |
| Aortic sinus pouch technique | 4 (1.2) |
| Unknown | 17 (4.9) |
| Lecompte manoeuvre | 320 (92.8) |
*Coronary anatomy description according to the Leiden Convention.
Cx, circumflex artery; DORV-SP-VSD, double outlet right ventricle with subpulmonary ventricular septal defect; IVS, intact ventricular septum; L or LAD, left anterior descending coronary artery; OTO, outflow tract obstruction; PAB, pulmonary artery banding; R, right coronary artery; TGA, transposition of the great arteries; VSD, ventricular septal defect.