Yangxinshi Tablet Intervention for Exercise Capacity in Patients With Chronic Coronary Syndrome

Inclusion Criteria: 1. age 18-75 years; 2. CCS patients in stable condition and clearly diagnosed by coronary artery imaging (at least one vessel stenosis ≥ 50%): stable angina, ischaemic cardiomyopathy, asymptomatic or stable symptoms, occult coronary heart disease, acute coronary syndrome (ACS), or \>3 months after coronary revascularization; 3. moderately to severely limited exercise tolerance: the maximum 6MWD is \< 450 m, or the metabolic equivalent (MET) as measured by treadmill cardiopulmonary exercise testing is \< 5 METs; 4. voluntary participation and signing of informed consent. Exclusion Criteria: 1. absolute or relative contraindications for the treadmill cardiopulmonary exercise test or 6-minute walk test (6MWT); 2. serious primary diseases, mental diseases, or malignant tumours that affect lifespan; 3. pregnancy, intended or suspected pregnancy, miscarriage, breastfeeding, or delivery in the last 6 months; 4. subjects not suitable for this study in the opinion of the researchers, such as subjects who are participating in other drug clinical trials or intervention studies.