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- W2982183856 abstract "Background Reliable assays to measure direct oral anticoagulant (DOAC) levels and their activity in critical situations are needed. Drug levels alone are not representative of the effect of DOACs on an individual's coagulation. We developed a technique that provides direct assessment of the global effect of rivaroxaban on the individual's coagulation in addition to plasma concentrations. Methods DOAC concentrations were determined in fifty patients using rivaroxaban, with the new assay, Xross-CAT. The effect of rivaroxaban on coagulation (activity) was measured with thrombin generation (TG) in platelet poor plasma using 5 pM tissue factor on the same device. The levels were validated with the Biophen DiXal assay. The prothrombin time (PT) and dilute Russell viper venom time (dRVVT) were performed to estimate the effect on coagulation. Results The variability of Xross-CAT was below 12%. Xross-CAT correlates well with Biophen DiXaI (rs = 0.885). The bias, determined by Bland-Altman analysis, was 4.9% and the Passing-Bablok equation was y = 1.1x − 2.1. The correlation of plasma levels with TG was moderate (ETP rs = −0.548; Peak rs = −0.559), as for the PT (rs = 0.739) and the dRVVT (rs = 0.692). Conclusions Xross-CAT shows a good correlation with Biophen DiXaI that was previously confirmed to accurately assess rivaroxaban levels. Bleeding and thrombotic complications are not necessarily associated with drug levels and could be influenced by concomitant risk factors. The main benefit of Xross-CAT is that it can be performed simultaneously with thrombin generation, providing an overview of the global anticoagulation status of a patient in relation to circulating DOAC levels." @default.
- W2982183856 created "2019-11-01" @default.
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- W2982183856 date "2019-12-01" @default.
- W2982183856 modified "2023-09-25" @default.
- W2982183856 title "Concomitant assessment of rivaroxaban concentration and its impact on thrombin generation" @default.
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- W2982183856 doi "https://doi.org/10.1016/j.thromres.2019.09.037" @default.
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