Division of Cardiovascular Medicine, Department of Medicine; Department of Population and Quantitative Health Sciences; Department of Pharmacy, UMass Memorial Medical Center
Cardiology | Cardiovascular Diseases | Geriatrics | Health Services Administration | Health Services Research
Background: Direct-acting oral anticoagulant (DOAC) dosing guidelines for atrial fibrillation recommend dose alteration based on age, renal function, body weight, and drug-drug interactions. There is paucity of data describing the frequency and factors associated with prescription of potentially inappropriate doses.
Methods and Results: In the ongoing SAGE-AF (Systematic Assessment of Geriatric Elements in Atrial Fibrillation) study, we performed geriatric assessments (frailty, cognitive impairment, sensory impairments, social isolation, and depression) for participants with atrial fibrillation (age > /=65 years, CHA2DS2VASc > /=2, no anticoagulant contraindications). We developed an algorithm to analyze DOAC dose appropriateness accounting for drug-drug interactions, age, renal function, and body weight. We also examined whether geriatric impairments were related to inappropriate dosing. Of 1064 patients prescribed anticoagulants, 460 received a DOAC. Participants were aged 74+/-7 years, 49% were women, and 82% were white. A quarter (23%; n=105) of participants received inappropriate DOAC dose, of whom 82 (78%) were underdosed and 23 (22%) were overdosed. Among participants receiving an inappropriate dose, 12 (11%) were identified using the drug-drug interactions criteria and would have otherwise been misclassified. In multivariable regression analyses, older age, higher CHA2DS2VASc score, and history of renal failure were associated with inappropriate DOAC dosing (P < 0.05). Geriatric conditions were not associated with inappropriate dosing.
Conclusions: In this cohort, over 20% of older patients with atrial fibrillation treated with DOACs were prescribed an inappropriate dose, with most being underdosed. Drug-drug interactions were common. Factors that influence prescription of guideline-nonadherent doses may be perception of higher bleeding risk or presence of renal failure in addition to lack of familiarity with dosing guidelines.
anticoagulant, atrial fibrillation, geriatrics, off‐label dosing
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© 2020 The Authors. Published on behalf of the American Heart Association, Inc., by Wiley. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
DOI of Published Version
Sanghai S, Wong C, Wang Z, Clive P, Tran W, Waring M, Goldberg R, Hayward R, Saczynski JS, McManus DD. Rates of Potentially Inappropriate Dosing of Direct-Acting Oral Anticoagulants and Associations With Geriatric Conditions Among Older Patients With Atrial Fibrillation: The SAGE-AF Study. J Am Heart Assoc. 2020 Mar 17;9(6):e014108. doi: 10.1161/JAHA.119.014108. Epub 2020 Mar 9. PMID: 32146898. Link to article on publisher's site
Journal of the American Heart Association
Sanghai S, Wong C, Wang Z, Clive P, Tran W, Waring M, Goldberg RJ, Hayward R, Saczynski JS, McManus DD. (2020). Rates of Potentially Inappropriate Dosing of Direct-Acting Oral Anticoagulants and Associations With Geriatric Conditions Among Older Patients With Atrial Fibrillation: The SAGE-AF Study. Open Access Articles. https://doi.org/10.1161/JAHA.119.014108. Retrieved from https://escholarship.umassmed.edu/oapubs/4185
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