Study design

1. Patients with congenital heart defects of any age group who were hospitalised on or after 1 October 2011 and on whom one of the following interventions was carried out*:    

• heart surgery and/or a heart catheter procedure

• pacemaker implantation and/or defibrillator implantation including change of device/probe

• ablation/rhythm surgery

2. Patients with acquired heart disease (0 up to <18 years) who were hospitalised on or after 1 October 2011 and on whom one of the following interventions was carried out*:    

• heart surgery and a heart catheter procedure

• pacemaker implantation and defibrillator implantation including change of device/probe

• ablation/rhythm surgery

3. Declaration of consent of the patient or parent/guardian

*The intention to carry out an intervention is decisive, not whether it was successful, i.e. an intervention during which, for example, an occlusion device was unable to be placed and is thus removed again is to be included as an intervention.