Abstract

MARTINUZZO, Marta et al. Plasma dabigatran: diluted thrombin time, Ecarin and diluted Russell Viper Venom Time. Acta bioquím. clín. latinoam. [online]. 2016, vol.50, n.2, pp.193-203. ISSN 0325-2957.

The aims of the study were to verify the analytical performance of Dilute Thrombin Time (DTI) test to measure plasma dabigatran concentration (cc) in two photo-optical coagulometers, compare Ecarin clotting Time (ECT) and DTI results, and correlate cc with classical coagulation tests: prothrombin time (PT), APTT, thrombin time (TT) and diluted Russell Viper Venom Time tests with high phospholipid concentration (DRVVTC). Forty three plasma samples from 40 patients taking dabigatran were drown at through (10-14 hs.since last dose). DTI and ECT showed repetitivity (%) <5.4% and <7.5%, interassay CV <6% and <9%, respectively, following EP15A2 protocol, acceptable considering a Allowed Total Error (TEa)<15%. Patients` cc: median 83 (4-945) ng/mL. The comparison between ACL TOP 300 and 500 coagulometers showed equivalent results by using the alternative method comparison test. ECT vs. DTI: acceptable by Deming`s regression (slope 1.143, Y insert -19.33). cc vs. APTT, TP and DRVVTC: nonlinear and moderate correlations with plateau reached at cc >350 ng/mL, r2 0.59, 0.66 y 0.59, respectively. TT is extremely prolonged at cc >50 ng/mL. In conclusion: DTI showed a good analytical performance in both coagulometers. ECT showed comparable results to DTI. We verified that dabigatran cc presented moderate correlations with PT, APTT and DRVVTC, and that these tests could only qualitative estimate cc >50 ng/mL.

Keywords : Dabigatran measurement; Diluted thrombin time; Prothrombin time; APTT; Ecarin clotting time; Diluted Russell viper venom time with high phospholipid concentration.

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