Direct Thrombin Inhibitors

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Abstract
Direct thrombin inhibitors (DTIs) are a new class of anticoagulants that bind directly to thrombin and block its interaction with its substrates. Some DTIs — such as recombinant hirudins, bivalirudin, and ximelagatran, either alone or in combination with melagatran — have undergone extensive evaluation in phase 3 trials for the prevention and treatment of arterial and venous thrombosis. The evidence concerning the clinical applicability of other DTIs, such as argatroban and dabigatran, is limited to phase 2 studies. Four parenteral DTIs have been approved by the Food and Drug Administration (FDA) in North America: hirudin and argatroban for the treatment of heparin-induced thrombocytopenia, bivalirudin as an alternative to heparin in percutaneous coronary intervention, and desirudin as prophylaxis against venous thromboembolism in hip replacement. This review discusses FDA-approved DTIs as well as those under evaluation in phase 2 or 3 clinical trials.

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