Keywords: Arrhythmias; CMR, cardiac magnetic resonance; CPVT, catecholaminergic polymorphic ventricular tachycardia; Cardiac arrest; ECG, electrocardiogram; Exome sequencing; Genetics; ICD, implantable cardioverter-defibrillator; LQTS, long QT syndrome; MYH6, myosin heavy chain 6 gene; PPM, permanent pacemaker; SNV, single nucleotide variant; Sinus node dysfunction.