Cited by 280Atrial Fibrillation Management and OutcomesAcute Ischemic Stroke ManagementVenous Thromboembolism Diagnosis and Management

Effectiveness and safety of warfarin initiation in older hemodialysis patients with incident atrial fibrillation

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Winkelmayer, Wolfgang C., Liu, Jun, Setoguchi, Soko, Choudhry, Niteesh K.·2011·Clinical Journal of the American Society of Nephrology

Abstract

BACKGROUND AND OBJECTIVES: Although generally recommended in atrial fibrillation (AF) patients, the effectiveness and safety of oral anticoagulation in dialysis patients with AF is unknown. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We assembled a cohort of older hemodialysis patients who initiated dialysis without prior record of AF and who had prescription drug benefits through three state-administered programs. The index event was a first hospitalization with diagnosed AF; patients with any recorded prior warfarin use were excluded. Eligible patients survived ≥30 days from discharge, and new warfarin use was recorded from prescription records during that 30-day window. Propensity-matched warfarin users and nonusers were compared using Cox regression. Outcomes included ischemic stroke, hemorrhagic stroke, and mortality. RESULTS: Among 2313 patients with new AF who survived 30 days from discharge, 249 (10.8%) filled a prescription for warfarin. Comparing 237 warfarin users and 948 propensity-matched nonusers over 2287 person-years of follow-up, the occurrence of ischemic stroke was similar (HR = 0.92; 95% CI, 0.61 to 1.37), whereas warfarin users experienced twice the risk of hemorrhagic stroke (HR = 2.38; 95% CI, 1.15 to 4.96). The risks of stroke, gastrointestinal hemorrhage, and mortality did not differ between groups. As-treated analyses yielded similar findings, as did analyses restricted to patients with CHADS(2) scores ≥2. CONCLUSIONS: Although we confirmed association between warfarin use and hemorrhagic stroke in dialysis patients with AF, we found no association between warfarin use and ischemic stroke. Adequately powered randomized trials are required to conclusively determine the risks and benefits of the studied warfarin indication in hemodialysis patients.

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  • Warfarin use was associated either with a neutral or increased risk of stroke in database analyses of patients on dialysis, including a population-based analysis in Canada (adjusted HR for stroke 1.14; 95% CI 0.78-1.67, adjusted HR for bleeding 1.44; 95% CI 1.13-1.85).

    “Warfarin use was associated either with a neutral or increased risk of stroke in database analyses of patients on dialysis, [419][420][421] including a population-based analysis in Canada (adjusted HR for stroke 1.14; 95% CI 0.78-1.67,adjusted HR for bleeding 1.44; 95% CI 1.13-1.85).422”

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Authors
Winkelmayer, W. C., Liu, J., Setoguchi, S., & Choudhry, N. K.
Affiliations
Brigham and Women's Hospital (US)
Corresponding author
  • Liu, Jun
  • Setoguchi, Soko
  • Choudhry, Niteesh K.
Venue
Clinical Journal of the American Society of Nephrology
Published
2011-11
Volume
6
Issue
11
Pages
2662-2668
ISSN
1555-9041 (ISSN-L)
OpenAlex
W2100505398
Cited by
280
References
17
Citations by year
2026: 3 · 2025: 6 · 2024: 9 · 2023: 10 · 2022: 15 · 2021: 8 · 2020: 12 · 2019: 16 · 2018: 29 · 2017: 33 · 2016: 37 · 2015: 30 · 2014: 37 · 2013: 21 · 2012: 13
FWCI
15.78
Type
journal article
Language
en
Open access
Locations
  • Clinical Journal of the American Society of Nephrology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • School of Medicine, Stanford University
  • National Institute of Diabetes and Digestive and Kidney Diseases (R21DK077336)
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
warfarin, atrial fibrillation, hemodialysis, older adults, oral anticoagulation, hemorrhagic stroke, ischemic stroke, gastrointestinal bleeding, mortality, CHADS2 score, anticoagulation initiation
MeSH terms
Age Factors, Aged, Aged, 80 and over, Anticoagulants, Atrial Fibrillation, Brain Ischemia, Female, Medicare, Renal Dialysis, Hospitalization, Humans, Kidney Failure, Chronic, Male, Middle Aged, Drug Prescriptions, Risk Factors, Time Factors, United States, Warfarin, Survival Rate, Logistic Models, Proportional Hazards Models, Case-Control Studies, Treatment Outcome, Risk Assessment, Intracranial Hemorrhages, Stroke

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