Considering imbalances in important baseline characteristics, multivariable logistic regression was used to evaluate the independent relationship between hemoglobin and MACEs after adjustment for a wide range of covariates, including age; gender; past history: hypertension, diabetes, hyperlipidemia, CAD, smoking history; the type of current AMI: STE or NSTE; heart rate; diastolic pressure; pulse pressure; LVEF; albumin; creatinine; CK-MB; TC; TG; LDL-C; HDL-C; index medications: aspirin, β-blocker, CCB, nitrates, ACE inhibitor, ARB, statin, thrombolysis, anticoagulation and PCI. The gene discussed is ACE; the disease is Hypertension.