Ecarin-based methods for measuring thrombin inhibitors
Methodology chapter published in Methods in Molecular Biology (2023)
Abstract
Ecarin is a venom from the saw-scaled viper, Echis carinatus, which catalyzes prothrombin into meizothrombin. This venom is used in several hemostasis laboratory assays, including ecarin clotting time (ECT) and ecarin chromogenic assays (ECA). The use of these ecarin-based assays was first implemented as a tool for monitoring the infusion of a direct thrombin inhibitor, hirudin. Subsequently, this method has been more recently employed for measuring either the pharmacodynamic or pharmacokinetic properties of the oral direct thrombin inhibitor, dabigatran. In this chapter, the procedure for performing manual ECT and automated and manual ECA for measuring thrombin inhibitors is described.
Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.
Summary
Comprehensive methodology chapter describing ecarin-based assays (ECT, ECA) for measuring direct thrombin inhibitors including hirudin, bivalirudin, argatroban, and dabigatran.
Why This Matters for Hirudotherapy
This article describes laboratory procedures for performing ecarin-based assays — including manual ecarin clotting time (ECT) and automated/manual ecarin chromogenic assays (ECA) — for measuring direct thrombin inhibitors, noting that these methods were originally implemented for monitoring hirudin infusion and subsequently adapted for measuring the pharmacodynamic and pharmacokinetic properties of dabigatran. Ecarin, a venom from the saw-scaled viper (Echis carinatus), catalyzes prothrombin into meizothrombin, forming the biochemical basis for these assays. This is relevant to ASH because ecarin-based assays represent a historically important laboratory monitoring tool specifically developed for hirudin therapy and remain relevant to clinical monitoring of hirudin-based anticoagulation. The caveat is that this is a methodological/laboratory techniques article rather than a clinical study, it presents no new experimental data, and its direct relevance is to laboratory monitoring of hirudin infusion rather than to the practice of leech-based hirudotherapy.
Citation
Ecarin-based methods for measuring thrombin inhibitors.
Gosselin RC · Methods in molecular biology, 2023
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