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Argatroban during percutaneous transluminal coronary angioplasty: Results of a dose-verification study

  • Clinical Investigation and Epidemiology
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Abstract

Background. Thrombin is a key enzyme in thrombogenesis. In animals, specific antithrombotic therapy at the time of coronary angioplasty reduced the incidence of subacute occlusion and inhibited the restenosis response. Argatroban is a highly selective synthetic thrombin antagonist that binds in a competitive manner. This is a report of a dose-verification study, assessing the safety and feasibility of intravenous Argatroban administration in patients undergoing percutaneous transluminal coronary angioplasty. Methods. Before angioplasty an intravenous bolus of 30 μg/kg argatroban was administered, followed by a continuous infusion of 3.5 μg/kg/min for 72 hours. Bolus injection was repeated, and the infusion rate was increased in order to achieve an activated coagulation time (ACT) of over 300 seconds. Following interim analysis, the bolus and initial infusion rate for the subsequent treatment groups was determined. Study endpoints were the occurrence of adverse events, coagulation tests, and qualitative angiogram reading. Patients were monitored by continuous 12-lead electrocardiographic recording over 24 hours, and underwent control angiography 18–24 hours following angioplasty. Results. Four treatment groups, comprised of 2, 8, 9, and 11 patients, respectively, were studied. The first two patients were excluded from analysis, since the initial dose was ineffective to attain an ACT-authorizing coronary angioplasty. The group with the highest dosage received a 250 μg/kg intravenous bolus of argatroban, followed by a 4 hour infusion of 15 μg/kg/min. At 4 hours the infusion rate was lowered to 3.8 μg/kg/min and was continued for 68 hours without adjustment for catheter removal. The adverse event profile included myocardial infarction, aortocoronary bypass graft, bailout procedures, and repeat coronary angioplasty. Thrombin-time (TT), activated partial thromboplastin time (APTT), and prothrombin time (PT) were significantly related to argatroban plasma concentration, as demonstrated by regression analyses (R-square 0.64, 0.71, and 0.84, respectively). Prothrombin fragments 1 and 2 and thrombin-antithrombin III complex did not fit into a mathematical model, but showed slightly increased levels after reduction or cessation of the infusion rate. Conclusions. This dose-verification study, including 30 patients at four dose levels, indicated that argatroban infusion in coronary angioplasty patients can be administered safely, and results in an adequate and predictable level of anticoagulation.

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Herrman, JP.R., Suryapranata, H., den Heijer, P. et al. Argatroban during percutaneous transluminal coronary angioplasty: Results of a dose-verification study. J Thromb Thrombol 3, 367–375 (1996). https://doi.org/10.1007/BF00133080

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