Inclusion Criteria:

In order to be eligible to participate in this study, a subject must meet all of the following criteria:

• Patients with d-TGA post ASO, ToF or TA
• ≥8 years

Exclusion Criteria:

One or more of the following inclusion criteria:

• All class IIa indications for a branch PA intervention:

• Persistent decreased RV function (based on gold standard CMR)

  • <18 years RVEF ≤55% (28)
  • ≥18 years RVEF<50% (29)

• Progressive tricuspid regurgitation (TR) (≥moderate)

• Isolated bifurcation stenosis:

  • Significant unilateral stenosis (≥50%)
  • Borderline bilateral PA stenosis (40-70%)

• Unbalanced perfusion (≤35/65%)

• RV/LV pressure ratio > 2/3 based on echocardiography

• Reduced lung perfusion or decreased objective exercise capacity (based of gold standard VO2 max during CPET)

  • <18 years VO2 peak <35 mL∙kg-1∙min-1 (boys) VO2 peak <30 mL∙kg-1∙min-1 (girls) (30)
  • ≥18 years VO2 peak <27 mL∙kg-1∙min-1 (men) VO2 peak <19 mL∙kg-1∙min-1 (women) (31)