TRDN and catecholaminergic polymorphic ventricular tachycardia: CPVT is caused by autosomal dominant mutations in the cardiac ryanodine receptor gene (RyR2) [1], the calmodulin gene (CALM1, CALM2) [2, 3] and the inward rectifying potassium channel gene (KCNJ2) [4] and autosomal recessive mutations in the cardiac calsequestrin gene (CASQ2) [5] and the triadin gene (TRDN) [6].