Adults with repaired Tetralogy of Fallot (TOF) often face significant long-term risks, including ventricular tachycardia (VT) and sudden cardiac death (SCD). Consequently, managing these arrhythmias during surgical pulmonary valve replacement (PVR) remains a critical challenge. A recent multicentre cohort study demonstrates that surgical ablation in TOF yields superior outcomes when guided by electrophysiological (EP) testing. By identifying specific anatomical isthmuses, surgeons can more effectively prevent future cardiac events.

Researchers evaluated 204 adult patients undergoing PVR between 2005 and 2022. Every participant underwent standardized pre-operative EP studies to map potential arrhythmia sources. Notably, the treating teams chose between an EP-guided strategy or an empiric ablation approach. The results revealed a stark contrast in effectiveness. Specifically, 74.1% of patients in the EP-guided group achieved non-inducibility for VT post-operatively. In contrast, only 15.0% of those receiving empiric ablation achieved the same result.

Enhancing Outcomes with Surgical Ablation in TOF

Furthermore, the study highlighted the long-term benefits of a targeted strategy. Patients who underwent EP-guided ablation experienced a 90% reduction in the risk of clinical VT or sudden cardiac death. This finding suggests that pre-operative EP testing provides a roadmap for more precise surgical intervention. Therefore, clinicians should consider integrating systematic EP mapping into the standard surgical workflow for TOF repairs.

Ultimately, these findings offer a clear path forward for adult congenital heart disease (ACHD) specialists. By moving away from empiric techniques, medical teams can significantly improve patient survival. This evidence-based approach ensures that the surgical intervention addresses the underlying electrical substrate along with the hemodynamic issues.

Frequently Asked Questions

What are the primary benefits of EP-guided surgical ablation in TOF?

EP-guided surgical ablation allows for the precise targeting of anatomical isthmuses responsible for ventricular tachycardia. This study shows it significantly improves post-operative non-inducibility and reduces long-term risks of sudden cardiac death.

How does empiric ablation compare to EP-guided techniques?

Empiric ablation is significantly less effective. The study found that only 15% of patients remained non-inducible after empiric ablation, compared to over 74% in the EP-guided cohort.

Is pre-operative EP testing necessary for all TOF patients undergoing PVR?

While management decisions are at the discretion of the treating team, the study suggests that systematic pre-operative EP testing should be considered a standard of care to optimize arrhythmic outcomes.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or establish a doctor-patient relationship. Refer to the latest local and national guidelines for clinical practice.

References

• Dib N et al. Tetralogy of Fallot: electrophysiology-guided surgical ablation during pulmonary valve replacement. Eur Heart J. 2026 May 28. doi: undefined. PMID: 42206474.


• Nelson JS, et al. European Congenital Heart Surgeons Association 2026 Clinical Practice Guidelines on Indications and Timing of Pulmonary Valve Replacement in Repaired Tetralogy of Fallot. Ann Thorac Surg. 2026 Apr 22.


• Bouyer B, et al. Electrophysiological study prior to planned pulmonary valve replacement in patients with repaired tetralogy of Fallot. J Cardiovasc Electrophysiol. 2023 Jun;34(6):1395-1404.