Nobori And Uncoated Stent In Coronary Attack

Inclusion Criteria: * age more than 20 years old * chest pain lasting more than 20 min * symptoms beginning within 12 hours before characterization * electrocardiogram showing ST-segment elevation or new appearance of left bundle branch block * increase in cardiac enzymes to more than 5-fold the normal laboratory values * infarct-related vessel are anatomically suitable for percutaneous revascularization * patients gave their signed, informed consent Exclusion Criteria: * previous stent implantation within 30 days * allergy to any of the followings : aspirin, heparin, clopidogrel, biolimus A9 or its derivatives, stainless steel 316L, PLA (Poly-Lactic Acid) Polymer or its derivatives, and contrast media * elective surgery scheduled within 6 months * renal insufficiency with creatinine level of more than 2.5 mg/dL * patients associated with bleeding and/or clotting disorders, and those refusing blood transfusion * history of massive gastrointestinal or urinary tract bleeding within 6 months * patients currently enrolled in other clinical trials * pregnancy