A Study of Low and Standard-dose Ticagrelor After Intervention for ACS Patients

Inclusion Criteria:

1. Subject must be at least 18 years of age
2. Patients should have undergone successful percutaneous coronary intervention withdrug-eluting stent for acute coronary syndrome
3. Subject understand the study requirements and the treatment procedures and providedinformed consent before the procedure

Exclusion Criteria:

1. Female of childbearing potential, unless a recent pregnancy test is negative, whopossibly plan to become pregnant any time after enrollment into this study
2. Active bleeding
3. Known hypersensitivity or contraindication to study medications
4. Non-cardiac co-morbid conditions are present with life expectancy <2 year or that mayresult in protocol non-compliance (per site investigator's medical judgment).
5. Subjects with Cerebral hemorrhage history
6. Subjects with stroke history in half a year
7. subjects with malignant tumor
8. subjects with whom oral anticoagulants are needed