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Updated: Jun 19, 2025

The WATCHMAN Left Atrial Appendage Closure Device for Atrial Fibrillation
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Will Factor XI Inhibitors Replace Current Anticoagulants for Stroke Prevention in Atrial Fibrillation?

Siddharth M Patel1, Christian T Ruff2

  • 1TIMI Study Group, Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, 60 Fenwood Road, Boston, MA, 02115, USA.

Current Cardiology Reports
|July 23, 2024
PubMed
Abstract

Insights

Novel anticoagulants targeting factor XI (FXI) show promise for reducing bleeding in atrial fibrillation patients. Further research is needed to confirm their effectiveness in preventing strokes.

Area of Science:

  • Cardiovascular Medicine
  • Pharmacology
  • Hemostasis

Background:

  • Current anticoagulants carry significant bleeding risks.
  • Factor XI (FXI) is a key target for developing safer anticoagulation therapies.

Purpose of the Study:

  • To review the factor XI (FXI) inhibitor hypothesis for novel anticoagulants.
  • To present preliminary clinical data from phase 2 studies in atrial fibrillation patients.

Main Methods:

  • Review of existing literature on FXI inhibitors.
  • Analysis of preliminary clinical data from phase 2 dose-ranging studies.

Main Results:

  • FXI pathway inhibition demonstrated substantial bleeding reductions compared to existing anticoagulants.
  • Phase 2 studies provide initial evidence for the safety profile of FXI inhibitors.

Conclusions:

  • FXI inhibition holds promise for safer anticoagulation in atrial fibrillation, particularly by reducing bleeding.
  • Larger clinical trials are essential to establish the efficacy of FXI inhibitors for stroke prevention.
Keywords:
AnticoagulantsAtrial fibrillationBleedingFactor XIStroke prevention

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