The formula for calculating the risk score is as follows: 0.4215 ∗ (apelin) − 0.3589 ∗ (apelin change rate) + 0.4587 ∗ (age) − 0.7173 ∗ I (pathological Q wave) − 0.6211 ∗ I (myocardial infarction history) − 0.6143 ∗ I (anterior wall myocardial infarction) + 0.5037 ∗ I (Killip's classification > I) − 0.3868 ∗ (uric acid) + 0.4065 ∗ (total cholesterol) + 1.2534 ∗ (cTnI) + 0.7149 ∗(left atrial diameter). Here, APLN is linked to myocardial infarction.