Abstract:
BACKGROUND:Apixaban is a non-vitamin K oral anticoagulant approved for prevention of stroke and systemic embolism in patients with nonvalvular atrial fibrillation (AF). Current labeling recommends dose reduction based on patient age, weight, and renal function. HYPOTHESIS:The aim of this study was to analyze adherence to current labeling instructions concerning initial apixaban dosing in clinical practice and identify factors associated with inappropriate dose reduction. METHODS:Patients with AF initiated on apixaban in 2016 were identified in the Heart Center Leipzig database. Records were screened to identify patient characteristics, prescribed apixaban dose, renal function, and further dosing-relevant secondary diagnoses and co-medication. RESULTS:We identified 569 consecutive patients with AF initiated on apixaban. In 301 (52.9%) patients, apixaban was prescribed in standard dose (5 mg b.i.d.) and in 268 (47.1%) in a reduced dose (2.5 mg b.i.d.). Of 268 patients receiving a reduced dose, 163 (60.8%) did not meet labeling criteria for dose reduction. In univariate and multivariate regression analysis, age (OR: 0.736, 95% CI: 0.664-0.816, P < 0.0001), patient weight (OR: 1.120, 95% CI: 1.076-1.166, P < 0.0001), and serum creatinine level (OR: 0.910, 95% CI: 0.881-0.940, P < 0.0001) were independent predictors for apixaban underdosage. CONCLUSIONS:In clinical practice, apixaban dosing is frequently inconsistent with labeling. Factors associated with inappropriate dose reduction are age, patient weight, and serum creatinine level, the same factors used as criteria for dose adjustment. However, in underdosed patients, the 3 factors did not meet the criteria for dose reduction.
journal_name
Clin Cardioljournal_title
Clinical cardiologyauthors
Buchholz A,Ueberham L,Gorczynska K,Dinov B,Hilbert S,Dagres N,Husser D,Hindricks G,Bollmann Adoi
10.1002/clc.22949subject
Has Abstractpub_date
2018-05-01 00:00:00pages
671-676issue
5eissn
0160-9289issn
1932-8737journal_volume
41pub_type
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