Evidence map›Paper›PMID 34633646›Full record

ArticleAmerican journal of cardiovascular drugs : drugs, devices, and other interventions2022

Direct Oral Anticoagulants and Warfarin for Atrial Fibrillation Treatment: Rural and Urban Trends in Medicare Beneficiaries.

Faye L Norby, Pamela L Lutsey, Nathan D Shippee, Lin Y Chen, Carrie Henning-Smith, Alvaro Alonso, Rob F Walker, Aaron R Folsom

Abstract read
In one paragraph

Article in American journal of cardiovascular drugs : drugs, devices, and other interventions, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

16 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Article
  3. Article
  4. Atrial fibrillation in the Americas.Lancet regional health. Americas · 2025
    Review
  5. Article
  6. Article
  7. Rural-Urban Disparities in the Uptake of New Diabetes Medications.Diabetes spectrum : a publication of the American Diabetes Association · 2025
    Article
  8. Article
  9. Article
  10. Article
  11. Insertable cardiac monitoring results in higher rates of atrial fibrillation diagnosis and oral anticoagulation prescription after ischaemic stroke.Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology · 2023
    Article
  12. Anticoagulation under-utilization in atrial fibrillation patients is responsible for a large proportion of strokes requiring endovascular therapy.Journal of stroke and cerebrovascular diseases : the official journal of National Stroke Association · 2023
    Article
  13. Article
  14. Article
  15. Article
  16. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Faye L NorbyDepartment of Cardiology, Center for Cardiac Arrest Prevention, Smidt Heart Institute, Cedars-Sinai Health System, Advanced Health Sciences Pavilion, Suite A9220, 127 S. San Vicente Blvd, Los Angeles, CA, 90048, USA. faye.norby@cshs.org.ORCID http://orcid.org/0000-0002-1975-0405
Pamela L LutseyDivision of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN, USA.
Nathan D ShippeeDivision of Health Policy and Management, University of Minnesota, Minneapolis, MN, USA.
Lin Y ChenCardiovascular Division, Department of Medicine, Cardiac Arrhythmia Center, University of Minnesota Medical School, Minneapolis, MN, USA.
Carrie Henning-SmithDivision of Health Policy and Management, University of Minnesota, Minneapolis, MN, USA.
Alvaro AlonsoDepartment of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA.
Rob F WalkerDivision of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN, USA.
Aaron R FolsomDivision of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN, USA.

Funding

Comparative Effectiveness of Oral Anticoagulants in Atrial FibrillationR01HL122200 · NHLBI · UNIVERSITY OF MINNESOTA · PI ALONSO, ALVARO · 2015 to 2017
$1.2M
Mentoring and Research in Patient-Oriented Cardiovascular PharmacoepidemiologyK24HL159246 · NHLBI · UNIVERSITY OF MINNESOTA · PI PAMELA L. Lutsey · 2021 to 2026
$644k
Mentoring in patient-oriented atrial fibrillation and cardiovascular researchK24HL148521 · NHLBI · EMORY UNIVERSITY · PI ALONSO, ALVARO · 2019 to 2023
$593k
american heart association 16EIA26410001national heart and lung institute K24HL148521NHLBI NIH HHS K24 HL148521NHLBI NIH HHS K24 HL159246NHLBI NIH HHS R01 HL122200
6 · The paper itself

Abstract

backgroundData are needed on the use of oral anticoagulation in patients with atrial fibrillation (AF) in rural versus urban areas, including the initiation of direct oral anticoagulants (DOACs).

objectiveWe used Medicare data to examine rural/urban differences in anticoagulation use in patients with AF.

methodsWe identified incident AF in a 20% sample of fee-for-service Medicare beneficiaries (aged ≥ 65 years) from 2011 to 2016 and collected ZIP code and covariates at the time of AF. We identified the first anticoagulant prescription filled, if any, following AF diagnosis. We categorized beneficiaries into four rural/urban areas using rural-urban commuting area codes and used Poisson regression models to compare anticoagulant use.

resultsWe included 447,252 patients with AF (mean age 79 ± 8 years), of which 82% were urban, 9% large rural, 5% small rural, and 4% isolated. The percentage who initiated an anticoagulant rose from 34% in 2011 to 53% in 2016, paralleling the uptake of DOACs. In a multivariable-adjusted analysis, those in rural areas (vs. urban) were more likely to initiate an anticoagulant. However, rural beneficiaries (vs. urban) were less likely to initiate a DOAC; those in isolated areas were 17% less likely (95% confidence interval [CI] 13-20), those in small rural areas were 12% less likely (95% CI 9-15), and those in large rural areas were 10% less likely (95% CI 8-12).

conclusionAmong Medicare beneficiaries with AF, anticoagulation use was low but increased over time with the introduction of DOACs. Rural beneficiaries were less likely to receive a DOAC.

Indexed as

Atrial FibrillationStrokeAdministration, OralAgedAged, 80 and overAnticoagulantsHumansMedicareUnited StatesWarfarinAnticoagulantsWarfarin

Identifiers

PMID34633646
PMCPMC9833644

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.