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Blood, 15 November 2004, Vol. 104, No. 10, pp. 3072-3077.
Prepublished online as a Blood First Edition Paper on July 27, 2004; DOI 10.1182/blood-2004-02-0621.
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CLINICAL OBSERVATIONS, INTERVENTIONS, AND THERAPEUTIC TRIALS
Lepirudin for prophylaxis of thrombosis in patients with acute isolated heparin-induced thrombocytopenia: an analysis of 3 prospective studies
Norbert Lubenow,
Petra Eichler,
Theresia Lietz,
Beate Farner, and
Andreas Greinacher
From the Dept of Immunology and Transfusion Medicine, Ernst-Moritz-Arndt University Greifswald, Greifswald, Germany.
This analysis of 3 prospective multicenter trials in patients with laboratory-confirmed acute heparin-induced thrombocytopenia (HIT) without clinically evident thromboembolic complications (TECs), isolated HIT, assessed the combined individual end points of death, new TECs, and limb amputation. Patients with the same inclusion criteria who did not receive lepirudin or danaparoid served as a contemporaneous control group. Ninety-one patients were treated with lepirudin (intravenous infusion 0.10 mg/kg/h, no bolus, activated partial thromboplastin time [aPTT]–adjusted to 1.5-2.5 times baseline) for a median of 11.0 days (range, 1-68 days). During the observation period (median 24 days), 13 (14.3%) deaths, 4 (4.4%) new TECs, 3 (3.3%) limb amputations (combined 18 [19.8%]), and 13 (14.3%) major bleeding events occurred. In comparison to the control group (N = 47), the combined end point (P = .0281) and new TECs (P = .02) were reduced, and major bleeding was not significantly different between groups (P = .5419). In renal impairment, lepirudin did not reach its steady state within 4 hours, and additional monitoring every 4 hours after start of lepirudin until steady state is reached is recommended. Lepirudin seems to be effective in patients with isolated HIT. Dose reductions in renal impairment are important. Keeping the aPTT in the range corresponding to 600 to 700 µg/L lepirudin during treatment may minimize bleeding complications.
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