P2RX7 and cardiomyopathy: Among these six genes, the P2RX7 gene showed two complementary variants (rs208294 and rs3751143) whose union, having one or no copies of variant yielded a reduced risk of cardiomyopathy in CCS (OR = 0.10; 95% CI: 0.04–0.27; p = 2.19 × 10−6).