Oral anticoagulant underutilization among elderly patients with atrial fibrillation: insights from the United States Medicare database
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Key result
Among elderly Medicare patients with atrial fibrillation, 51.3% were not prescribed an oral anticoagulant, with age ≥ 85 years (OR 0.55) and intracranial bleeding (OR 0.29) strongly predicting lower utilization.
Why the study?
Oral anticoagulants reduce stroke risk in atrial fibrillation, but their underutilization patterns require analysis.
What are the prevalence and predictors of oral anticoagulant underutilization in elderly Medicare patients with incident atrial fibrillation and elevated stroke risk?
Population
1,204,507 AF patients with CHA2DS2-VASc score >= 2 from the US CMS Database
Comparison
OAC prescription vs no OAC prescription, and DOACs vs warfarin
Design
Retrospective database cohort study
Follow-up
Mean 2.4 years
Authors
Discussion
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Implication
Persistent OAC underutilization in elderly Medicare AF patients signals care gaps; leaves open targeted interventions pending prospective data.
Study Design
Type
Cohort (n=1,204,507)
Structured PICO
What are the prevalence and predictors of oral anticoagulant underutilization in elderly Medicare patients with incident atrial fibrillation and elevated stroke risk?
P
Population
1,204,507 US Medicare patients aged 65 years or older with newly diagnosed atrial fibrillation and a CHA2DS2-VASc score ≥ 2, followed for a mean of 2.4 years.
E
Exposure
Oral anticoagulant (OAC) prescription (direct oral anticoagulants [DOACs] or warfarin)
C
Comparator
No oral anticoagulant prescription
O
Outcome
Prevalence and predictors of OAC underutilization
Main Result
Odds Ratio: 0.55 (95% CI 0.55–0.56)
Despite guideline recommendations, over half of elderly Medicare patients with incident atrial fibrillation and elevated stroke risk are not prescribed oral anticoagulants, with underutilization strongly predicted by advanced age, female sex, Black race, and bleeding history.
Limitations
- Retrospective observational design precludes causal inference.
- Reliance on administrative claims data may introduce coding errors and lack clinical accuracy.
- Medicare database does not include laboratory values or self-reported data.
- Presence of prescription claims does not guarantee medication consumption by the patient.
- Did not account for drug costs, access to care, formulary changes, or physician preferences.
- Results may not be generalizable to the entire US population as it only included Medicare fee-for-service patients ≥ 65 years old.
Cite This Study
Munir et al. (2022) conducted a cohort in Atrial fibrillation (n=1,204,507). Age ≥ 85 years vs. Younger age groups was evaluated on Oral anticoagulant (OAC) prescription (OR 0.55, 95% CI 0.55-0.56). Among elderly Medicare patients with atrial fibrillation, 51.3% were not prescribed an oral anticoagulant, with age ≥ 85 years (OR 0.55) and intracranial bleeding (OR 0.29) strongly predicting lower utilization.
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