CASQ2 and catecholaminergic polymorphic ventricular tachycardia: There are two types of genes that have been found to be associated with the occurrence of CPVT: one is related to the gene mutations of cardiomyocyte ryanodine receptor (RyR2), which is CPVT1, accounts for about 50–60%; the other is related to the gene mutations of cardiomyocyte calcium collecting protein (CASQ2), which is CPVT2, accounts for about 3–5%.