NPPB and familial dilated cardiomyopathy: Interestingly, plasma NT-proBNP (14,932.09 ± 1655.47 vs. 5024.36 ± 863.16 pg/ml, P = 0.04) and hs-CRP (7.075 ± 3.187 vs. 3.049 ± 2.939 mg/L, P = 0.01) levels in patients with DCM who were positive for β1-AR autoantibodies were significantly higher than those in patients negative for β1-AR autoantibodies (Fig. 6).