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  • Title: Comparison of Anti-factor Xa Activity Among Three Different Factor Xa Inhibitors in Non-valvular Atrial Fibrillation Patients with Renal Impairment.
    Author: Tobe A, Osanai H, Tanaka A, Sakaguchi T, Kambara T, Nakashima Y, Asano H, Ishii H, Ajioka M, Murohara T.
    Journal: Clin Drug Investig; 2020 Jun; 40(6):567-573. PubMed ID: 32314297.
    Abstract:
    BACKGROUND: Factor-Xa inhibitors (FXaIs) are widely used for the treatment of non-valvular atrial fibrillation (NVAF). Although we have previously reported the distribution of the anti-factor Xa activity (AXA) values of three different FXaIs in NVAF patients, the differences in the distribution of AXA values among the different FXaIs in patients with renal impairment (RI) have not been fully elucidated. METHODS: Trough and peak AXA values were measured in 94 patients taking rivaroxaban, 124 patients taking apixaban, and 66 patients taking edoxaban. Of them, we identified 26 patients with moderate RI [creatinine clearance (CrCl) 30-49 mL/min] and 17 patients with severe RI (CrCl 15-29 mL/min) in the rivaroxaban cohort, 37 patients with moderate RI and 17 patients with severe RI in the apixaban cohort, and 21 patients with moderate RI and 9 patients with severe RI in the edoxaban cohort. AXA values were measured using chromogenic AXA assays. Both trough and peak AXA values were compared between patients with moderate RI and those with severe RI in each cohort, and differences in the peak-to-trough ratio among the different drugs were assessed. RESULTS: In the rivaroxaban cohort, the peak AXA value was significantly higher in patients with severe RI than in those with moderate RI. In the apixaban cohort, neither the trough nor peak AXA values significantly differed between patients with moderate RI and those with severe RI. In the edoxaban cohort, the trough AXA value was significantly higher in patients with severe RI than in those with moderate RI, and peak AXA tended to be higher in patients with severe RI. The peak-to-trough ratio of AXA values was significantly lower in patients taking apixaban than in those taking rivaroxaban and edoxaban. CONCLUSION: Among Japanese NVAF patients with RI, the peak or trough AXA values were higher in patients with severe RI than in those with moderate RI when taking rivaroxaban and edoxaban, whereas both the peak and trough AXA values were similar between patients with severe RI and those with moderate RI when taking apixaban. The peak-to-trough ratio of AXA values was the lowest in patients taking apixaban.
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