Ad Hoc Percutaneous Coronary Intervention Study in Acute Coronary Syndrome Patients

Inclusion Criteria: * Provision of signed and dated informed consent before initiation of any study-related procedures * Male or female patients aged 18 years or older * Documented acute coronary syndrome and troponin negative and undergoing Ad Hoc percutaneous coronary intervention (PCI) * Females must be post menopausal or surgically sterile * Taking aspirin as an anti-platelet medication Exclusion Criteria: * Use of any thienopyridine or ticagrelor within 7 days prior to randomization * Any indication for oral anticoagulant (e.g., atrial fibrillation, mitral stenosis or prosthetic heart valve) * Contraindication that ticagrelor or clopidogrel should not be administered Patient requires dialysis * History of intolerance or allergy to aspirin