Cited by 4,793Atrial Fibrillation Management and OutcomesAcute Ischemic Stroke ManagementVenous Thromboembolism Diagnosis and Management

Meta-analysis: antithrombotic therapy to prevent stroke in patients who have nonvalvular atrial fibrillation

Hart, Robert G., Pearce, Lesly A., Aguilar, Maria I.·2007·Annals of Internal Medicine

Abstract

BACKGROUND: Atrial fibrillation is a strong independent risk factor for stroke. PURPOSE: To characterize the efficacy and safety of antithrombotic agents for stroke prevention in patients who have atrial fibrillation, adding 13 recent randomized trials to a previous meta-analysis. DATA SOURCES: Randomized trials identified by using the Cochrane Stroke Group search strategy, 1966 to March 2007, unrestricted by language. STUDY SELECTION: All published randomized trials with a mean follow-up of 3 months or longer that tested antithrombotic agents in patients who have nonvalvular atrial fibrillation. DATA EXTRACTION: Two coauthors independently extracted information regarding interventions; participants; and occurrences of ischemic and hemorrhagic stroke, major extracranial bleeding, and death. DATA SYNTHESIS: Twenty-nine trials included 28,044 participants (mean age, 71 years; mean follow-up, 1.5 years). Compared with the control, adjusted-dose warfarin (6 trials, 2900 participants) and antiplatelet agents (8 trials, 4876 participants) reduced stroke by 64% (95% CI, 49% to 74%) and 22% (CI, 6% to 35%), respectively. Adjusted-dose warfarin was substantially more efficacious than antiplatelet therapy (relative risk reduction, 39% [CI, 22% to 52%]) (12 trials, 12 963 participants). Other randomized comparisons were inconclusive. Absolute increases in major extracranial hemorrhage were small (< or =0.3% per year) on the basis of meta-analysis. LIMITATION: Methodological features and quality varied substantially and often were incompletely reported. CONCLUSIONS: Adjusted-dose warfarin and antiplatelet agents reduce stroke by approximately 60% and by approximately 20%, respectively, in patients who have atrial fibrillation. Warfarin is substantially more efficacious (by approximately 40%) than antiplatelet therapy. Absolute increases in major extracranial hemorrhage associated with antithrombotic therapy in participants from the trials included in this meta-analysis were less than the absolute reductions in stroke. Judicious use of antithrombotic therapy importantly reduces stroke for most patients who have atrial fibrillation.

Integrity signals

Registry

Crossref · 10.7326/0003-4819-146-12-200706190-00007

Cites

57 of 57 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Flagged first, then by citations

1 of the 58 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Hart, R. G., Pearce, L. A., & Aguilar, M. I.
Affiliations
Mayo Clinic (US)
Venue
Annals of Internal Medicine
Published
2007-06-19
Volume
146
Issue
12
Pages
857-867
ISSN
  • 0003-4819 (ISSN-L)
  • 1539-3704
OpenAlex
W1999468381
Cited by
4,793
References
58
Citations by year
2026: 90 · 2025: 145 · 2024: 198 · 2023: 248 · 2022: 234 · 2021: 288 · 2020: 295 · 2019: 298 · 2018: 324 · 2017: 373 · 2016: 390 · 2015: 352 · 2014: 332 · 2013: 354 · 2012: 331
FWCI
16.38
Type
journal article
Language
en
Open access
closed
Locations
  • Annals of Internal Medicine (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Atrial Fibrillation Management and Outcomes
  • Health Sciences › Medicine › Epidemiology › Acute Ischemic Stroke Management
  • Health Sciences › Medicine › Internal Medicine › Venous Thromboembolism Diagnosis and Management
Keywords
non-valvular atrial fibrillation, stroke prevention, antithrombotic therapy, warfarin, antiplatelet agents, hemorrhagic stroke, ischemic stroke, extracranial bleeding, anticoagulation
MeSH terms
Aged, Anticoagulants, Atrial Fibrillation, Fibrinolytic Agents, Hemorrhage, Humans, Platelet Aggregation Inhibitors, Warfarin, Stroke

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review