Antiplatelet Effects of Tirofiban vs. Cangrelor N-STEMI Patients Undergoing Percutaneous Coronary Intervention

Inclusion Criteria: 1\. NSTEMI meeting the following criteria: 1. Patients 18 years of age or older with one or more of the following symptoms: * new ST-segment depression or transient elevation of at least 1 mm * elevations in troponin I, troponin T, or creatine kinase MB levels above ULN 2. Eligible for ticagrelor, cangrelor, aspirin, UFH, and GP IIb/IIIa inhibitor treatment. 3. Admitted at cardiac catheterization laboratory hospital or associated facility. 4. Competent mental condition to provide informed consent. Exclusion Criteria: 1. Unstable angina, STEMI 2. Cardiogenic shock 3. Refractory ventricular arrhythmias 4. New York Heart Association class IV congestive heart failure 5. Cardiac arrest within 1 week of study entry 6. History of hemorrhagic or ischemic stroke, TIA, sub-arachnoid hemorrhage or intracranial neoplasm, arteriovenous malformation, or aneurysm 7. Fibrinolytic therapy within 48 hours of study entry 8. Active pathological bleeding or history of bleeding diathesis 9. Severe hepatic insufficiency 10. Current peptic ulceration 11. Increased bleeding risk, per investigator judgment 12. Known anemia (hematocrit\<25%)/thrombocytopenia (platelet count \< 100,000mm3) 13. Surgery within 4 weeks before study entry or planned surgery within 2 months after study entry 14. Any P2Y12 receptor inhibitor or GP IIb/IIIa inhibitor within 7 days of study entry 15. Receiving warfarin or other coumadin derivatives or NOACs within the last 10 days with an INR \>1.5 secs or planned use during the hospitalization period 16. Contraindication to the use of ticagrelor and/or aspirin 17. Receiving or will receive oral anticoagulation or other oral antiplatelet therapy (except aspirin) that cannot be safely discontinued within the next 3 months 18. Receiving daily NSAIDs or COX2 inhibitors that cannot be discontinued or anticipated to require \>2 weeks of daily NSAIDs or COX2 inhibitors during study 19. Investigational drug in last 30 days or presently enrolled in drug/device study 20. Women of childbearing potential (post-menopausal women can be enrolled if at least 1 year of amenorrhea or surgically sterile) 21. Condition associated with poor treatment compliance (e.g., alcoholism, mental illness, or drug dependence) 22. Inability to provide written informed consent and to understand the full meaning of the informed consent