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Semin Thromb Hemost 2002; 28(5): 431-438
DOI: 10.1055/s-2002-35283
Copyright © 2002 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA. Tel.: +1(212) 584-4662

Hirudin in Heparin-Induced Thrombocytopenia

Norbert Lubenow, Andreas Greinacher
  • Ernst-Moritz-Arndt University, Greifswald, Germany
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Publication History

Publication Date:
06 November 2002 (online)

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ABSTRACT

Heparin-induced thrombocytopenia (HIT), a serious side effect of heparin treatment, requires alternative anticoagulation in most affected patients. The recombinant hirudin (r-hirudin) lepirudin has been approved for this purpose after two prospective trials in laboratory-confirmed HIT patients. Other drugs available for this purpose are danaparoid sodium (a heparinoid) and argatroban, a synthetic direct thrombin inhibitor. In this article, recommendations for optimal use of r-hirudin in HIT are given, covering therapy in uncomplicated patients as well as in special situations such as heparin reexposure of HIT patients. Because lepirudin's half-life depends on renal function, it may vary between 1 and 200 hours, which requires individual dose adjustments. Lepirudin compares favorably with danaparoid, based on retrospective data. No direct comparisons of lepirudin with argatroban are available, but argatroban might offer advantages in patients with renal failure, because it is mainly eliminated hepatically. Major hemorrhage, the main risk of lepirudin treatment, occurring in about 15% of patients, makes close monitoring important. New monitoring tools, such as the ecarin clotting time (ECT), might further reduce bleeding risks. Antihirudin antibodies, which can alter the pharmacokinetics as well as the pharmacodynamics of hirudin, can also be countered by close monitoring and appropriate dose adjustments. Whereas hirudins have not yet managed to gain importance in non-HIT indications such as unstable coronary syndromes, they have a major role to play in the treatment of HIT. The choice between the available drugs for HIT, namely lepirudin, danaparoid, and argatroban, has to be made according to the clinical presentation of the patient.

KEYWORDS

Heparin-induced thrombocytopenia - HIT - lepirudin - hirudin - danaparoid - argatroban

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