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Objectives: This study was designed to assess the feasibility and safety of enoxaparin in combination with glycoprotein (GP) IIb/IIIa inhibitors during percutaneous coronary intervention (PCI) as part of an early invasive strategy in patients presenting with acute coronary syndromes (ACS)., Background: Trials in patients with ACS have evaluated the utility of enoxaparin, adjuvant GP IIb/IIIa inhibitors with PCI, and an early invasive approach. Information about the combination of all three of these approaches, however, is limited., Methods: Forty-nine patients with ACS underwent cardiac catheterization, of whom 23 underwent PCI with enoxaparin and GP IIb/IIIa inhibitors., Results: The primary endpoint of the study, a composite of death, myocardial infarction or urgent revascularization at 30 days, occurred in 8% of patients undergoing PCI. There were no deaths. One patient received a blood transfusion. No other adverse events occurred. These event rates were comparable to those from the pooled EPILOG/EPISTENT database, in which intravenous unfractionated heparin was used in conjunction with GP IIb/IIIa receptor blockade. The mean anti-Xa level in patients undergoing PCI was 0.74 0.48 U/ml. The majority of patients who underwent PCI within eight hours of their last dose of enoxaparin had therapeutic anti-Xa levels., Conclusion: In patients with ACS, enoxaparin in combination with GP IIb/IIIa inhibitors and an early invasive approach resulted in comparable clinical complication and bleeding rates versus historical references utilizing unfractionated heparin.