After obesity adjustment multivariate logistic regression showed that the apelin to NT-proBNP ratio < 0.82 × 10−2 units remained the only independent predictor for HFpEF (OR = 1.44; 95% CI: 1.18–2.77; p = 0.001) HFpEF in T2DM patients. The gene discussed is APLN; the disease is type 2 diabetes mellitus.