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A pedigree and clinical characteristics of the family. AT, atrial tachycardia; AVB, atrioventricular block; CPA, cardiopulmonary arrest; ICD, implantable cardioverter defibrillator; PPM, permanent pacemaker; Prominent U, Prominent U‐waves at rest; SB, sinus bradycardia; SD, sudden death. Carriers of an exon3 deletion of RYR2 (RYR2‐exon3 deletion) and a KCNJ2 E118D variant are shown as the graphic symbols in the bottom
