Table 2.
Clinical characteristics of the cohort. Data are n (%) or median (IQR), unless otherwise specified. Percentages are column-wise for totals and row-wise for subgroups
| Variable | Total (n=70) |
| Sex | |
| Female | 33 (47%) |
| Male | 37 (53%) |
| Delivery method | |
| Normal vaginal delivery | 27 (39%) |
| Forceps vaginal delivery | 6 (9%) |
| Ventouse vaginal delivery | 6 (9%) |
| Emergency caesarean | 19 (27%) |
| Elective caesarean | 12 (17%) |
| Induction of labour | 41 (59%) |
| Prenatal diagnosis | 68 (97%) |
| Outborn | 2 (3%) |
| Gestational age at birth (weeks) | 38.3 (37.4–38.7) |
| Gestational age at preoperative MRI (weeks) | 39.0 (38.4–39.7) |
| Age at scan (days) | 5 (2–7) |
| Birth weight (kg) (mean, SD)* | 2.94 (0.57) |
| Head circumference (cm) | 33.5 (32.2–34.5) |
| Apgar score | |
| 1 min | 9 (7–9) |
| 5 min | 9 (9–10) |
| Cord arterial pH (mean, SD)* | 7.29 (0.082) |
| Prostaglandin E2 | 31 (44%) |
| Cardiac arrest | 0 (0%) |
| Days mechanical ventilation | 0 (0–1) |
| Balloon atrial septostomy | 13 (19%) |
| Umbilical | 6 (46%) |
| Femoral | 7 (54%) |
| Heart lesion | |
| Transposition of the great arteries | 28 (40%) |
| Tetralogy of Fallot | 13 (19%) |
| Coarctation of the aorta | 11 (16%) |
| Pulmonary atresia | 5 (7%) |
| Hypoplastic left heart syndrome | 4 (6%) |
| Pulmonary stenosis | 3 (4%) |
| Truncus arteriosus | 3 (4%) |
| Tricuspid atresia | 2 (3%) |
| Large VSD | 1 (1%) |
*Normally distributed variables, summarised by mean and SD.