Mutations in the triadin (TRDN; CPVT5), calmodulin-1 (CALM1; CPVT4) and the inward rectifying potassium channel gene KCNJ2 have also been associated with autosomal dominant forms of CPVT [13], [14]. Here, TRDN is linked to catecholaminergic polymorphic ventricular tachycardia.