Figure 1. The occurrence of heart failure in different congenital heart disease severities. Patients are assigned to the types of heart defect in a mutually exclusive way.

When >1 defect was present in patients, the patient was assigned to the defect of highest complexity or with the biggest functional impact. ASD indicates atrial septal defect; CHD, congenital heart disease; CCTGA, congenitally corrected transposition of great arteries; HF, heart failure; PDA, patent ductus arteriosus; RVOTO, right ventricle outflow track obstruction; and VSD, ventricular septal defect.