Genetic testing is recommended for CPVT-susceptibility genes—RyR2, CASQ2, CALM1-3, TRDN and TECRL—in all probands with a definitive clinical diagnosis of CPVT and may be considered in individuals with idiopathic ventricular fibrillation (VF) upon identification of an adrenergic trigger. Here, CALM1 is linked to paroxysmal familial ventricular fibrillation.