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Intra- and inter- individual rivaroxaban concentrations and potential bleeding risk in patients with atrial fibrillation

  • Pharmacodynamics
  • Published:
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Abstract

Background

Routine laboratory monitoring of rivaroxaban and dose adjustment relating to exposure is currently not recommended. However, in certain clinical situations, assessment of rivaroxaban levels is desirable.

Objectives

To examine inter- and intra-subject plasma rivaroxaban variability in patients with atrial fibrillation (AF) and to correlate these results to clinical outcomes.

Patients/methods

We included 60 patients with AF treated with rivaroxaban: half on 20 mg daily (R20) and half on 15 mg daily (R15). Three trough and peak blood samples were collected with an interval of 6–8 weeks apart. Plasma rivaroxaban concentration was measured directly by liquid chromatography-tandem mass-spectrometry (LC-MS/MS) and indirectly by anti-Xa for rivaroxaban, prothrombin time (PT), and activated partial thromboplastin time (APTT).

Results

Patients on R15 were older (76 ± 6 vs 71 ± 6 years), had lower creatinine clearance (60 ± 26 vs 99 ± 32 mL/min), higher CHADS2 (2.5 ± 1.2 vs 1.8 ± 1.3), all p < 0.01, but had similar rivaroxaban concentrations in trough samples to patients on R20. There was no significant intra-individual variability for trough or peak rivaroxaban concentration assessed by LC-MS/MS, anti-Xa, or PT. Trough rivaroxaban levels determined by LC-MS/MS (48 ± 30 vs 34 ± 26, p = 0.02) and anti-Xa, but not with PT and APTT, were higher in patients with bleeding than in patients without it.

Conclusions

There is a pronounced inter-, but not intra-individual variability in the rivaroxaban trough levels in patients with AF. Assessment of trough rivaroxaban concentration with LC-MS/MS or anti-Xa, but not with APTT or PT, may help to identify patients at increased risk of bleeding.

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Acknowledgments

The excellent technical assistance of M. Jakopanec and M. Behrič is gratefully acknowledged.

Funding

The study was supported by the Slovenian Research Agency (Grant No. P3-0308).

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Correspondence to Alenka Mavri.

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Appendix

Appendix

Fig. 3
figure 3

Correlations between rivaroxaban plasma concentrations measured by liquid chromatography-tandem mass spectrometry (LC-MS/MS) and coagulation assays: prothrombin time (PT) and activated partial thromboplastin time (APTT). Full circles at peak and empty circles at trough. The dotted lines represent the upper reference levels of the assays

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Miklič, M., Mavri, A., Vene, N. et al. Intra- and inter- individual rivaroxaban concentrations and potential bleeding risk in patients with atrial fibrillation. Eur J Clin Pharmacol 75, 1069–1075 (2019). https://doi.org/10.1007/s00228-019-02693-2

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  • DOI: https://doi.org/10.1007/s00228-019-02693-2

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