Guidance for assessing operability in pulmonary arterial hypertension associated with congenital heart disease
| Pulmonary vascular resistance index WU·m2 | Pulmonary vascular resistance WU | Correctability/favourable long-term outcome |
| <4 | <2.3 | Yes |
| 4–8 | 2.3–4.6 | Individual patient evaluation in tertiary centres |
| >8 | >4.6 | No |
WU: Wood Units. Special considerations include: age of patient, type of defect, comorbidities, resting or exercise-induced desaturation is a concern and PAH therapy (treat with intent-to-repair approach has not been proven).