CALM1 and catecholaminergic polymorphic ventricular tachycardia: Alternatively, CPVT can be diagnosed by conducting genetic testing or by identifying heterozygous disease-causing mutations in RyR2, CALM1-3, KCNJ2, or bi-allelic pathogenic variants in CASQ2, trans-2,3-enoyl-CoA reductase like (TECRL); or TRDN is pathognomonic [29-31].