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Atrial Fibrillation, Stroke Risk, and Warfarin Therapy Revisited: A Population-Based Study

Open access
Björck, Staffan, Palaszewski, Bo, Friberg, Leif, Bergfeldt, Lennart·2013·Stroke

Abstract

Background and Purpose—: Atrial fibrillation (AF) is a major risk factor for ischemic stroke. This study aims to update the knowledge about AF and associated stroke risk and benefits of anticoagulation. Methods—: We extracted data from the hospital, specialized outpatient, and primary healthcare and drug registries in a Swedish region with 1.56 million residents. We identified all individuals who had received an AF diagnosis during the previous 5 years; all stroke events during 2010; and patients with AF aged ≥50 years who had received warfarin during 2009. Results—: AF had been diagnosed in 38 446 subjects who were alive at the beginning of 2010 (prevalence of 3.2% in the adult [≥20 years] population); ≈46% received warfarin therapy. In 2010, there were 4565 ischemic stroke events and 861 intracranial hemorrhages. AF had been diagnosed in 38% of ischemic events (≥50% among those aged ≥80 years) and in 23% of intracranial hemorrhages. An AF diagnosis was often lacking in hospital discharge records after stroke events. Warfarin therapy was associated with an odds ratio of 0.50 (confidence interval, 0.43–0.57) for ischemic stroke and, despite an increased risk of intracranial hemorrhage, an odds ratio of 0.57 (confidence interval, 0.50–0.64) for the overall risk for stroke. Conclusions—: AF is more common than present guidelines suggest. The attributable risk of AF for ischemic stroke increases with age and is close to that of hypertension in individuals aged ≥80 years. Because a majority of patients with AF with increased risk for stroke had not received anticoagulation therapy, there is a large potential for improvement.

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Metadata

Authors
Björck, S., Palaszewski, B., Friberg, L., & Bergfeldt, L.
Venue
Stroke
Published
2013-11
Volume
44
Issue
11
Pages
3103-3108
ISSN
  • 0039-2499 (ISSN-L)
  • 1524-4628
OpenAlex
W2004592440
Cited by
334
References
7
FWCI
11.86
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Atrial Fibrillation, Stroke Risk, and Warfarin Therapy Revisited: A Population-Based Study. https://app.cochat.ai/papers/10.1161/strokeaha.113.002329
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Björck, S., Palaszewski, B., Friberg, L., & Bergfeldt, L. (2013). Atrial Fibrillation, Stroke Risk, and Warfarin Therapy Revisited: A Population-Based Study. Stroke. https://doi.org/10.1161/strokeaha.113.002329

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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