This study is a randomized, double-blind, placebo-controlled, parallel clinical trial in a Chinese population with heart failure after myocardial infarction. The objective is to observe the efficacy and safety of Wenyang huoxue fang in the treatment of heart failure after myocardial infarction.

Currently, there is a lack of high-quality evidence-based support for TCM treatment of heart failure after myocardial infarction. In addition, previous studies have found that the method of warming Yang and activating blood circulation is effective in treating coronary heart disease, and the core pathogenesis of heart failure after myocardial infarction is also Yang deficiency and blood stasis. Therefore, this project aims to evaluate the clinical value of warming Yang and activating blood circulation in the treatment of heart failure after myocardial infarction. Through pharmacological research and detection, the efficacy of Wenyang huoxue prescription in heart failure rats after intervention of myocardial infarction was evaluated, mir-233-ISO signaling pathway was detected before and after treatment, and its mechanism of action was further clarified from the perspective of epigenetics and classical pathway of heart failure.

Objective To investigate the efficacy and safety of Wenyang Huoxue fang in the treatment of heart failure after myocardial infarction.

Inclusion Criteria:

• 18-75 years old;
• A history of acute myocardial infarction;
• Cardiac function grade II-IV;
• LVEF 40% or less; NT-proBNP level ≥ 450 pg/mL; -All men and women can sign the informed consent form.-

Exclusion Criteria:

• Coronary artery bypass grafting was performed within 12 weeks.
• Undergo or possibly undergo cardiac resynchronization therapy;
• Primary valvular disease, left ventricular outflow tract obstruction, myocarditis, aneurysm, uncontrolled severe arrhythmia, cardiogenic shock, unstable angina pectoris, or acute myocardial infarction;
• Having a serious primary liver, kidney or blood system disease or having a serious mental illness or a systemic disease that is out of control;
• Serum creatinine > 194.5 mol/L or serum potassium > 5.5mmol /L;
• The level of alanine aminotransferase or alkaline phosphatase is 1.5 times of the normal upper limit ;
• Abnormal blood pressure control, systolic blood pressure exceeding 180mmHg or diastolic blood pressure exceeding 110mmHg;
• Pregnancy or lactation;
• Known or suspected allergy to research drugs;
• To receive another investigational drug within 30 days of randomization or to be unwilling or unable to provide written consent.