SCN5A and catecholaminergic polymorphic ventricular tachycardia: The chief answerable for each ailment: SQTS (KCNH2 20% and KCNQ1 30%), CPVT (RyR2 50%), BrS (SCN5A 25%), and LQTS (SCN5A 15%, KCNH2 30% and KCNQ1 40%) (25).