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The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
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The evolving field of stroke prevention in patients with atrial fibrillation

Michael D Ezekowitz1, Timothy H Aikens, Annamarie Brown

  • 1Lankenau Institute for Medical Research, 100 Lancaster Avenue, Wynnewood, PA 19096, USA. ezekowitzm@mlhs.org

Stroke
|September 30, 2010
PubMed

Insights

Dabigatran offers superior stroke prevention for atrial fibrillation patients compared to warfarin. While effective, some patients experienced gastrointestinal issues, and myocardial infarction rates were slightly higher.

Area of Science:

  • Cardiology
  • Pharmacology

Background:

  • Vitamin K antagonists (VKAs) are standard for stroke prevention in atrial fibrillation (AF).
  • Limitations in VKA tolerance necessitate exploring alternative anticoagulation therapies.
  • Direct thrombin and factor Xa inhibitors are under investigation.

Purpose of the Study:

  • To evaluate the efficacy and safety of dabigatran compared to warfarin for stroke prevention in AF patients.
  • To assess the impact of different dabigatran doses on stroke risk, bleeding events, and other adverse outcomes.

Main Methods:

  • Phase III clinical trial comparing dabigatran (110 mg and 150 mg twice daily) with warfarin.
  • Assessment of stroke incidence, major bleeding, intracranial hemorrhages, and myocardial infarction rates.

Main Results:

  • The 150-mg dose of dabigatran was more effective than warfarin for stroke prevention and similar in major bleeding risk.
  • The 110-mg dose was non-inferior for efficacy and reduced major bleeding.
  • Both dabigatran doses significantly reduced intracranial hemorrhages compared to warfarin.
  • Higher rates of discontinuation due to gastrointestinal symptoms were observed with dabigatran.
  • Slightly increased rates of clinically apparent myocardial infarction were noted in dabigatran groups.

Conclusions:

  • Dabigatran represents a significant advancement in stroke prevention for AF, demonstrating superiority over warfarin.
  • Dabigatran offers a valuable alternative anticoagulation option, though gastrointestinal side effects and monitoring for myocardial infarction are important considerations.

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