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[Atrial fibrillation and stroke].

H P Mattle1, M Schwerzmann, Ch Seiler

  • 1Neurologische Universitätsklinik, Inselspital, Bern. heinrich.mattle@insel.ch

Therapeutische Umschau. Revue Therapeutique
|October 29, 2003
PubMed
Summary

Atrial fibrillation (AF) increases stroke risk. Anticoagulation, particularly warfarin, is crucial for preventing emboli in high-risk patients. Antiplatelet agents are for low-risk individuals.

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Area of Science:

  • Cardiology
  • Neurology
  • Pharmacology

Context:

  • Atrial fibrillation (AF) is the most common cardiac arrhythmia, affecting millions globally and increasing with age.
  • AF impairs hemodynamics, leading to thrombus formation and systemic embolism, often manifesting as neurological events like stroke.
  • Approximately 5% of AF patients experience stroke annually, with one in six strokes occurring in this population.

Purpose:

  • To outline the importance of antithrombotic therapy in managing atrial fibrillation.
  • To compare the efficacy of warfarin and aspirin in preventing stroke in AF patients.
  • To define risk stratification criteria for selecting appropriate antithrombotic treatment.

Summary:

  • Anticoagulation, specifically adjusted-dose warfarin with an INR of 2.0-3.0, significantly reduces stroke risk by approximately 60% in non-valvular AF.
  • Acetylsalicylic acid is less effective, reducing stroke risk by only 20%, and is recommended for low-risk AF patients.
  • High-risk AF patients (e.g., >65 years, history of stroke, hypertension, diabetes, heart failure) require anticoagulation.

Impact:

  • Establishes anticoagulation as the primary treatment for stroke prevention in intermediate to high-risk AF patients.
  • Clarifies the role of antiplatelet therapy for younger, low-risk AF patients.
  • Provides evidence-based guidance for clinical decision-making in AF management to reduce cerebrovascular events.

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