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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effect of platelet glycoprotein IIb/IIIa integrin blockade on activated clotting time during percutaneous transluminal coronary angioplasty or directional atherectomy (the EPIC trial). Evaluation of c7E3 Fab in the Prevention of Ischemic Complications trial.

The activated clotting time (ACT) has been used during percutaneous transluminal coronary angioplasty (PTCA) to monitor the extent of thrombin inhibition and anti-coagulation from heparin in an attempt to minimize untoward thrombotic events and hemorrhagic complications. With the introduction of potent platelet inhibitors, such as the chimeric monoclonal antibody c7E3, to interventional cardiology, the utility of measuring and regulating procedural ACT has not been examined. To investigate the possible influence of platelet IIb/IIIa antagonism on procedural ACT, we reviewed data from the Evaluation of c7E3 Fab in the Prevention of Ischemic Complications (EPIC) trial. In the EPIC trial, 2,099 patients undergoing PTCA with a high risk of abrupt vessel closure were randomized to receive placebo (n = 696) or the IIb/IIIa platelet receptor antagonist c7E3 Fab (n = 1,403). Despite receiving less procedural heparin, and fewer patients receiving very high heparin doses (> 14,000 U) than the placebo group, those receiving c7E3 had a higher mean (401 vs 367 seconds, p < 0.001) ACT when corrected for body weight. The ACT is increased approximately 35 seconds by the platelet IIb/IIIa receptor antagonist c7E3 Fab. This has important implications for dosing conjunctive heparin therapy and performing PTCA or directional coronary atherectomy in the setting of IIb/IIIa-directed therapy.[1]


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