Keywords: ATP, antitachycardia pacing; Congenital heart disease; Dextrocardia; ICD, implantable cardioverter-defibrillator; Pediatrics; RV, right ventricle; RVOT, right ventricular outflow tract; S-ICD, subcutaneous implantable cardioverter-defibrillator; Subcutaneous implantable cardioverter-defibrillator; Tetralogy of Fallot; VF, ventricular fibrillation.