Although it is heterogeneous, the genetic basis of SCD has been widely studied in children and adults, and mutations have been found in the KCNQ1, KCNH2 and SCN5A genes (LQTS) and in RyR2 and CASQ2 (CPVT) [8,9]. This evidence concerns the gene RYR2 and catecholaminergic polymorphic ventricular tachycardia.