ABSTRACT
Recombinant hirudins (r-hirudins) are potent direct thrombin inhibitors increasingly
used for alternative anticoagulation, especially in heparin-induced thrombocytopenia.
R-hirudins are almost exclusively eliminated by the kidneys, and a close correlation
between r-hirudin clearance and endogenous creatinine clearance has been observed.
Accordingly, the pharmacokinetics of r-hirudin are altered in patients with renal
insufficiency. A decline of renal r-hirudin clearance is associated with an increase
of r-hirudin half-life and the area under the curve (AUC). Therefore, renal impairment
necessitates reduction of r-hirudin dose to avoid overdose or inadequate accumulation
of the thrombin inhibitor. To this end, close monitoring of r-hirudin anticoagulation
is required, which at best is performed by measuring r-hirudin blood levels by ecarin
clotting times (ECT) or chromogenic assays, in addition to activated partial thromboplastin
time (aPTT). Recent studies showed that r-hirudin anticoagulation is feasible in acute
or chronic renal failure treated with continuous or intermittent renal replacement
therapy, if appropriate r-hirudin dosing and adequate monitoring are warranted. High-volume
hemofiltration with r-hirudin-permeable hemodialyzers constitutes a valuable means
to markedly reduce r-hirudin blood concentration and total r-hirudin body content
in case of r-hirudin overdose or r-hirudin-associated bleeding. In the future, the
hepatically eliminated direct thrombin inhibitor argatroban may facilitate alternative
anticoagulation in patients with renal insufficiency.
KEYWORDS
Recombinant hirudin - renal insufficiency - pharmacokinetics - hemodialysis - dosing