NPPB and type 2 diabetes mellitus: We found that in the entire T2DM HF patient population the levels of adropin were found to be negatively correlated with LVEF (r = −0.58, p = 0.001), NYHA class (r = −0.30, p = 0.012), BMI (r = −0.29, p = 0.012), hs-CRP (r = −0.28, p = 0.001), triglycerides (r = −0.23; p = 0.044), fasting plasma glucose (r = −0.22; p = 0.042), HOMA-IR (r = −0.27; p = 0.001), and HbA1c (r = −0.24; p = 0.010), while positively correlated with NT-proBNP levels (r = 0.36; p = 0.001), LAVI (r = 0.32; p = 0.001), high-density lipoprotein cholesterol (r = 0.26; p = 0.001), and eGFR (r = 0.30; p = 0.001).