SCN5A and catecholaminergic polymorphic ventricular tachycardia: Till now, numerous rare variants in the SCN5a gene have been reported in association with inherited atrial or ventricular arrhythmias, such as long QT syndrome (LQTS), Brugada syndrome (BrS), and catecholaminergic polymorphic ventricular tachycardia (CPVT) [7].