After statin treatment, in patients with DCM and co-existing AF, higher values of NT-proBNP and IL-6 were observed compared to non-AF patients (1530 ± 1054 vs 1006 ± 1195, p = 0.04 and (14.16 ± 13.40 vs 6.74 ± 5.45, p = 0.02, respectively). This evidence concerns the gene NPPB and familial dilated cardiomyopathy.