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Prevention of stroke in patients with nonvalvular atrial fibrillation

R G Hart1, D G Sherman, J D Easton

  • 1University of Texas Health Science Center, San Antonio 78284-7883, USA.

Neurology
|September 25, 1998
PubMed

Insights

Atrial fibrillation (AF) significantly increases stroke risk. Warfarin is recommended for high-risk patients, while aspirin suits low-risk individuals, guiding effective stroke prevention strategies.

Area of Science:

  • Cardiology
  • Neurology
  • Pharmacology

Background:

  • Atrial fibrillation (AF) is an independent risk factor for stroke, accounting for approximately 16% of all ischemic strokes.
  • Understanding the pathogenesis and risk associated with AF-related stroke is crucial for effective prevention.

Purpose of the Study:

  • To review the risk and pathogenesis of stroke in nonvalvular atrial fibrillation (AF).
  • To evaluate the efficacy and risks of various stroke prevention strategies in AF patients.

Main Methods:

  • Literature review focusing on 13 randomized controlled trials of antithrombotic therapy.
  • Analysis of stroke risk stratification schemes and antithrombotic treatment outcomes.

Main Results:

  • The average annual stroke risk in AF patients is about 5%, varying widely with risk factors. Patients with prior stroke/TIA face the highest risk (approx. 12%/year).
  • Warfarin (INR 2-3) reduces stroke risk by ~70%, while aspirin offers a ~20% reduction. Treatment numbers needed to prevent one stroke annually range from 20 to 200 based on risk level.
  • Risk stratification identifies patients benefiting most from anticoagulation, though generalizability to practice requires further assessment.

Conclusions:

  • Nonvalvular AF patients face significant ischemic stroke rates. Risk stratification aids in selecting appropriate lifelong anticoagulation.
  • Warfarin is recommended for high-risk AF patients if safe. Aspirin is an option for low-risk patients or those unable to take warfarin.
  • For moderate-risk AF patients, decisions on antithrombotic prophylaxis should balance bleeding risk and patient preference.
Abstract

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