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Related Experiment Videos

Substrate modification or ventricular tachycardia induction, mapping, and ablation as the first step? A randomized

Juan Fernández-Armenta1, Diego Penela1, Juan Acosta1

  • 1Arrhythmia Section, Cardiology Department, Thorax Institute, Hospital Clínic, Universitat de Barcelona, Barcelona, Spain,; IDIBAPS (Institut d'Investigació Agustí Pi i Sunyer), Barcelona, Spain.

Heart Rhythm
|May 17, 2016
PubMed
Summary

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Starting ventricular tachycardia (VT) ablation with substrate modification reduces procedure time, radiation, and cardioversion needs. This approach is as effective as the standard VT induction, mapping, and ablation protocol for long-term outcomes.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • The optimal sequence for ventricular tachycardia (VT) ablation, particularly when combined with substrate modification, remains unclear.
  • Current protocols often involve VT induction, mapping, and ablation as the initial step.

Purpose of the Study:

  • To evaluate the efficacy and safety of initiating scar-related VT ablation with substrate modification versus the standard VT induction-first approach.
  • To compare procedure times, radiation exposure, and clinical outcomes between the two protocols.

Main Methods:

  • A randomized trial involving 48 patients with structural heart disease and clinical VTs.
  • Group 1 underwent substrate modification (scar dechanneling) first, while Group 2 followed the standard VT induction, mapping, and ablation protocol.
Keywords:
Catheter ablationMyocardial infarctionNonischemic cardiomyopathySubstrate ablationVentricular tachycardia

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  • Key metrics included procedure/fluoroscopy times, cardioversion rates, acute success, and long-term VT recurrence.

    • Main Results:

    • The substrate modification-first group (Group 1) demonstrated significantly shorter procedure times (209 vs 262 min) and fluoroscopy times (14 vs 21 min).
    • Group 1 also required less electrical cardioversion (25% vs 54%).
    • Acute success rates were comparable, and there was no significant difference in long-term VT recurrence between the groups.

    Conclusions:

    • Performing VT induction and mapping before substrate ablation increases procedure duration, radiation exposure, and cardioversion requirements.
    • Starting with substrate modification is a safe and effective strategy for VT ablation, offering procedural advantages without compromising long-term outcomes.