Safety evaluations will be performed at specified intervals throughout the study and will consist of laboratory tests, vital signs (such as blood pressure), physical examinations and the occurrence and severity of adverse events as well as other study specific procedures. Patients will receive either Abciximab: 0.25 mg/kg bolus (to a maximum of 30 mg) followed by a 0.125 µg/kg/min infusion (to a maximum of 10 µg/min) for 12 hours or a bolus of placebo followed by infusion for 12 hours