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Recently heparin-induced thrombocytopenia type II has been diagnosed more frequently and does not exclude hemodialysis patients. Up to now, recombinant hirudin is the only available anticoagulant showing no immunologic cross reactions with heparin. However, the use of r-hirudin in hemo dialysis patients with different degrees of residual renal func tions is impossible using standard dosages because elimination of r-hirudin varies depending on the degree of residual renal function. Therefore the first study was carried out using con secutive r-hirudin anticoagulated hemodialyses to determine the appropriate dose of r-hirudin. Ten hemodialysis patients with creatinine clearance values ranging between 0 and 13 mL/min/1.73m 2  were anticoagulated with r-hirudin. An initial bolus of 0.1 mg/kg bwt before the first hemodialysis, resulted in an average r-hirudin blood concentration of 305 ng/mL at the end of treatment. The dose for each of the following four he modialyses was adjusted individually to reach the minimum therapeutic r-hirudin blood concentration. At the end of these treatments the mean blood r-hirudin concentration was 422 ng/mL. The necessary mean doses ranged between 0.008 and 0.125 mg/kg bwt correlating to the creatinine clearance values of the patients. All hemodialyses of the study were effective and safe. Bleeding times determined during r-hirudin antico agulation were significantly lower than control values mea sured 2 days after a heparin administration. The study proved that r-hirudin may be an efficient and safe heparin alternative as a hemodialysis anticoagulant when the individual's residual renal function is noted for dosage and dose adjustment and is controlled by drug monitoring using the ecarin clotting time.

R-Hirudin as Anticoagulant in Regular Hemodialysis Therapy: Finding of Therapeutic R-Hirudin Blood/Plasma Concentrations and Respective Dosages