How does atrial fibrillation (AF) affect the risk of stroke?

Updated: Dec 18, 2018
  • Author: Salvador Cruz-Flores, MD, MPH, FAHA, FCCM, FAAN, FACP, FANA; Chief Editor: Helmi L Lutsep, MD  more...
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Patients with atrial fibrillation have a stroke risk of 4.5% per year, which anticoagulation reduces to 1.4% per year (70% relative risk reduction with warfarin therapy). [15] Patients with additional risk factors (eg, age >75 years, recent stroke or transient ischemic attack [TIA], systemic embolism, hypertension, heart failure, or diabetes) have an increased stroke risk of at least 8% per year.

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