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Accessory pathway ablation in Ebstein anomaly: A challenging substrate.

Iqbal El-Assaad1, Elizabeth S DeWitt1, Douglas Y Mah1

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Catheter ablation for accessory pathways in Ebstein anomaly has improved outcomes, but recurrence remains a challenge. Recent advancements significantly reduced recurrence rates, though repeat procedures are often necessary.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Pediatric Cardiology

Background:

  • Catheter ablation of accessory pathways (APs) in Ebstein anomaly (EA) is linked to high recurrence rates.
  • Understanding factors influencing AP ablation outcomes in EA is crucial for improving patient management.

Purpose of the Study:

  • To compare the outcomes of AP ablation in EA between an early (1990-2004) and a recent (2005-2019) era.
  • To identify variables associated with AP recurrence after catheter ablation in EA patients.

Main Methods:

  • Retrospective review of catheter ablations for supraventricular tachycardia in EA patients.
  • Analysis of 76 patients, focusing on AP characteristics, ablation success, recurrence rates, and long-term outcomes.

Main Results:

  • Acute success for AP ablation was 89%, with no difference between eras. However, 31% of patients required repeat procedures.
  • The recent era showed significantly lower 1-year recurrence rates (19%) compared to the early era (62%).
  • Younger age at electrophysiological study and the early ablation era were predictors of recurrence.

Conclusions:

  • While AP ablation outcomes in EA have improved, a significant recurrence risk persists, often necessitating repeat procedures.
  • Advancements in ablation techniques and patient selection have led to better outcomes in recent years.