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Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
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[Electrical cardioversion for non-valvular atrial fibrillation--underestimated risk for thromboembolic

H H Klein1

  • 1Medizinische Klinik II, Schwerpunkt Kardiologie/Pneumologie, Klinikum Idar-Oberstein. h.klein@io.shg-kliniken.de

Deutsche Medizinische Wochenschrift (1946)
|June 6, 2013
PubMed

Insights

Electrical cardioversion for atrial fibrillation increases thromboembolism risk, even with anticoagulation. Enhanced anticoagulation post-procedure may mitigate this risk.

Area of Science:

  • Cardiology
  • Vascular Medicine
  • Clinical Electrophysiology

Background:

  • Electrical cardioversion aims to restore normal heart rhythm in non-valvular atrial fibrillation patients.
  • Established risk of thromboembolism (5%) exists with inadequate anticoagulation before and after cardioversion.
  • A lesser-known increased thromboembolic risk is observed even with standard anticoagulation during cardioversion.

Purpose of the Study:

  • To highlight the increased risk of thromboembolism following electrical cardioversion in non-valvular atrial fibrillation patients on standard anticoagulation.
  • To compare the thromboembolic risk associated with cardioversion versus non-cardioversion periods.
  • To explore potential strategies for mitigating this procedural risk.

Main Methods:

  • Analysis of thromboembolic complication rates in patients undergoing electrical cardioversion for non-valvular atrial fibrillation.
  • Comparison of observed thromboembolic risk during the month post-cardioversion with baseline monthly risks (0.13-0.2%) from clinical trials.
  • Discussion of anticoagulation strategies, including the potential benefit of intensified anticoagulation (INR > 2.5) in the early post-cardioversion period.

Main Results:

  • The monthly risk of thromboembolism following cardioversion is 3-6 times higher than the baseline risk in non-valvular atrial fibrillation patients on standard anticoagulation.
  • This increased risk is observed despite patients being on established anticoagulation regimens.
  • The risk associated with electrical versus pharmacological cardioversion remains to be fully elucidated.

Conclusions:

  • Electrical cardioversion, while beneficial for symptom management, carries an underappreciated increased risk of thromboembolism in non-valvular atrial fibrillation patients.
  • This procedural risk necessitates acknowledgment and careful management.
  • Intensified anticoagulation for 10-14 days post-cardioversion may be a viable strategy to minimize thromboembolic complications.

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