Ticagrelor is an oral, reversibly-binding, direct-acting P2Y12 receptor antagonist used clinically for the prevention of atherothrombotic events in patients with acute coronary syndromes (ACS). Guideline recommendations on the use of dual antiplatelet therapy (DAPT) have been formulated that ticagrelor 90 mg twice daily plus aspirin in preference to clopidogrel 75mg daily plus aspirin for patients who have an ACS with or without ST-segment elevation. However, few East Asian patients (or those of East Asian descent) have been included in these trials to assess the use of these drugs. In Korea and Japan, it has been reported that low doses of ticagrelor might have a more potent inhibition of platelet aggregation (IPA) than clopidogrel (75 mg once daily) in healthy subjects and patients with stable coronary artery disease, respectively. But it is still not clear whether a low dose of ticagrelor is superior to clopidogrel in a large population of Chinese ACS patients. A recent study on pharmacokinetics and tolerability of ticagrelor has found that maximum plasma concentration and area under the plasma concentration-time curve of ticagrelor (90 mg twice daily) and its active metabolite (AR-C124910XX) tended to be approximately 40% higher in healthy Chinese volunteers compared with Caucasian subjects. This data also suggested that a low dose of ticagrelor might be more appropriate for Chinese ACS patients. In view of a large diurnal variation with a single daily dose, a lower dose twice daily may be a better choice for Chinese patients. Therefore, the investigators performed this randomized, single-blind, crossover clinical trial to observe the efficacy and safety of low-dose ticagrelor (22.5 mg twice daily) in comparison to clopidogrel (75mg once daily) in Chinese patients with stable coronary artery disease.

Ticagrelor is an oral, reversibly-binding, direct-acting P2Y12 receptor antagonist used clinically for the prevention of atherothrombotic events in patients with acute coronary syndromes (ACS). Guideline recommendations on the use of dual antiplatelet therapy (DAPT) have been formulated that ticagrelor 90 mg twice daily plus aspirin in preference to clopidogrel 75mg daily plus aspirin for patients who have an ACS with or without ST-segment elevation. However, few East Asian patients (or those of East Asian descent) have been included in these trials to assess the use of these drugs. In addition, a growing body of data supported that East Asian might have different adverse event profiles (thrombophilia and bleeding) and "therapeutic window" compared with white subjects. Furthermore, "East Asian paradox" phenomenon has been also described that East Asian patients have a higher prevalence of platelet reactivity during DAPT, but an ischaemic event rate following percutaneous coronary intervention (PCI) or ACS is similar or even lower than white patients. In Korea and Japan, it has been reported that low doses of ticagrelor might have a more potent inhibition of platelet aggregation (IPA) than clopidogrel (75 mg once daily) in healthy subjects and patients with stable coronary artery disease, respectively. But it is still not clear whether a low dose of ticagrelor is superior to clopidogrel in a large population of Chinese ACS patients. A recent study on pharmacokinetics and tolerability of ticagrelor has found that maximum plasma concentration and area under the plasma concentration-time curve of ticagrelor (90 mg twice daily) and its active metabolite (AR-C124910XX) tended to be approximately 40% higher in healthy Chinese volunteers compared with Caucasian subjects. This data also suggested that a low dose of ticagrelor might be more appropriate for Chinese ACS patients. In view of a large diurnal variation with a single daily dose, a lower dose twice daily may be a better choice for Chinese patients. Therefore, the investigators performed this randomized, single-blind, crossover clinical trial to observe the efficacy and safety of low-dose ticagrelor (22.5 mg twice daily) in comparison to clopidogrel (75mg once daily) in Chinese patients with stable coronary artery disease.

Inclusion Criteria:

• Stable Coronary Artery Disease

  1. stable angina
  2. low-risk unstable angina
  3. variant angina
  4. patients with asymptomatic with appropriate therapy（including percutaneous coronary intervention）.

Exclusion Criteria:

1. ACS
2. planned use of glycoprotein IIb/IIIa receptor inhibitors, adenosine diphosphate (ADP) receptor antagonists, or anticoagulant therapy during the study period
3. platelet count <100g/L
4. creatinine clearance rate < 30ml/min
5. diagnosed as respiratory or circulatory instability (cardiac shock, severe congestive heart failure NYHA II-IV or left ventricular ejection fraction < 40%)
6. a history of bleeding tendency
7. aspirin, ticagrelor or clopidogrel allergies
8. diabetes.