PARIS, September 8 /PRNewswire-FirstCall/ -- The New England Journal of Medicine publishes the international STEEPLE trial (Safety and Efficacy of Enoxaparin in Percutaneous Coronary Intervention (PCI): An International Randomized Evaluation), which showed that a single intravenous bolus of enoxaparin of 0.5 mg/kg is associated with significantly less bleeding, and both studied doses were associated with more predictable anticoagulation levels and similar efficacy than the current standard, unfractionated heparin (UFH), in patients undergoing elective PCI or coronary angioplasty.