| Cyanosis? | Ductal-dependent? |
Left-sided obstructive lesions |
Hypoplastic left heart syndrome | Yes | Yes |
Valvar AS |
| Cyanosis or differential cyanosis* | Yes |
| No | No |
COA |
| Differential cyanosis* | Yes |
| No | No |
Interrupted aortic arch | Differential cyanosis* (pattern of cyanosis varies based upon type) | Yes |
Right-sided obstructive lesions |
Tetralogy of Fallot | Variable | Possibly¶ |
Tetralogy of Fallot with pulmonary atresia | Yes | Yes (unless multiple or large aortopulmonary collaterals are present) |
Pulmonary atresia with intact interventricular septum | Yes | Yes |
PS |
| Yes | Yes |
| No | No |
Tricuspid atresia | Yes | Possibly¶ |
Severe neonatal Ebstein anomaly | Yes | PossiblyΔ |
Parallel circulations |
Transposition of the great arteries | Yes◊ | Yes |
Other |
TAPVC | Yes | No§ |
Large VSD | No | No |
AV canal defect | No | No |
Truncus arteriosus | Yes | No |