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Thomas A, Fang MC, Kogan S, Hubbard CC, Friedman PN, Gong L, Klein TE, Nutescu EA, O'Brien TJ, Tuck M, Perera MA, Schwartz JB. Apixaban Concentrations in Routine Clinical Care of Older Adults With Nonvalvular Atrial Fibrillation. JACC. ADVANCES 2022; 1:100039. [PMID: 37961076 PMCID: PMC10643025 DOI: 10.1016/j.jacadv.2022.100039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 04/25/2022] [Accepted: 04/28/2022] [Indexed: 11/15/2023]
Abstract
BACKGROUND Direct-acting oral anticoagulants are first-line agents for prevention of stroke in patients with nonvalvular atrial fibrillation (NVAF), but data are limited for the oldest patients, and with reduced dosing. OBJECTIVES To determine steady-state apixaban peak and trough concentrations during routine care of older adults with NVAF, compare concentrations to clinical trial concentrations, and explore factors associated with concentrations. METHODS A cross-sectional study of medically stable older adults with NVAF (≥75 years or ≥70 years if Black) receiving apixaban. Peak (2-4.4 hours post-dose) and trough (before next dose) concentrations were determined by anti-Xa activity calibrated chromogenic assay. Patient characteristics associated with concentrations were determined by multivariate modeling. RESULTS The median age of patients (n = 115) was 80 (interquartile range: 77-84) years. The cohort comprised 46 women and 69 men; of which 98 are White, 11 Black, and 6 Asian. With 5 mg twice daily per labelling (n = 88), peak concentrations were higher in women: 248 ± 105 vs 174 ± 67 ng/mL in men (P < 0.001) and exceeded expected 95% range in 6 of 30 vs 0 of 55 men (P = 0.002). With 2.5 mg twice daily per label (n = 11), concentrations were <5 mg twice daily (peak: 136 ± 87 vs 201 ± 90 ng/mL, P = 0.026; trough: 65 ± 28 vs 109 ± 56 ng/mL, P < 0.001), but not different than 2.5 mg twice daily without reduction criteria (n = 13; peak: 132 ± 88; trough: 65 ± 31 ng/mL). Covariates associated with concentrations included sex, number of daily medications, and creatinine clearance. CONCLUSIONS Older women had higher than expected peak apixaban concentrations, and 2.5 mg twice daily produced lower concentrations than standard dosing. Factors not currently included in dosing recommendations affected concentrations. The impact of apixaban concentrations on outcomes needs evaluation.
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Affiliation(s)
- Alveena Thomas
- Division of Geriatrics, Department of Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Margaret C. Fang
- Division of Hospital Medicine, Department of Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Scott Kogan
- Department of Laboratory Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Colin C. Hubbard
- Division of Hospital Medicine, Department of Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Paula N. Friedman
- Department of Pharmacology, Center for Pharmacogenomics, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Li Gong
- Department of Biomedical Data Science, Stanford University, Stanford, California, USA
| | - Teri E. Klein
- Department of Biomedical Data Science and Department of Medicine, Stanford University, Stanford, California, USA
| | - Edith A. Nutescu
- Department of Pharmacy Practice and Center for Pharmacoepidemiology and Pharmacoeconomic Research, College of Pharmacy, University of Illinois Chicago, Chicago, Illinois, USA
| | - Travis J. O'Brien
- Department of Pharmacology and Physiology, School of Medicine and Health Sciences, The George Washington University, Washington, DC, USA
| | - Matthew Tuck
- Washington DC VA Medical Center, Washington, DC, USA
- Department of Medicine, The George Washington University, Washington, DC, USA
| | - Minoli A. Perera
- Department of Pharmacology, Center for Pharmacogenomics, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Janice B. Schwartz
- Division of Geriatrics, Department of Medicine, University of California-San Francisco, San Francisco, California, USA
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Perreault S, Denus S, White‐Guay B, Côté R, Schnitzer ME, Dubé M, Dorais M, Tardif J. Oral Anticoagulant Prescription Trends, Profile Use, and Determinants of Adherence in Patients with Atrial Fibrillation. Pharmacotherapy 2019; 40:40-54. [DOI: 10.1002/phar.2350] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sylvie Perreault
- Faculty of Pharmacy Université de Montréal Montreal Quebec Canada
| | - Simon Denus
- Faculty of Pharmacy Université de Montréal Montreal Quebec Canada
- Montreal Heart Institute Montreal Quebec Canada
| | - Brian White‐Guay
- Faculty of Medicine Université de Montréal Montreal Quebec Canada
| | - Robert Côté
- Department of Neurology and Neurosurgery McGill University Montreal Quebec Canada
| | | | - Marie‐Pierre Dubé
- Faculty of Medicine Université de Montréal Montreal Quebec Canada
- Department of Neurology and Neurosurgery McGill University Montreal Quebec Canada
| | - Marc Dorais
- StatSciences Inc. Notre‐Dame‐de‐l’Île‐Perrot Quebec Canada
| | - Jean‐Claude Tardif
- Montreal Heart Institute Montreal Quebec Canada
- Faculty of Medicine Université de Montréal Montreal Quebec Canada
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