Proarrhythmic effect of radiofrequency catheter ablation on the right ventricular moderator band

Figures

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  FIGURE 1. Baseline ECG showing PVCs at bigeminal frequency.

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  FIGURE 2. Electrogram at the site of initial ablation was 25 ms presystolic (left panel). Activation maps of the right ventricle (right panel) in the right anterior oblique (top image) and left anterior oblique (bottom image) show the earliest activation at the distal septum that corresponded to the septomarginal trabeculations initiating the moderator band. Red dots depict ablation lesions.

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  FIGURE 3. Runs of repetitive polymorphic VT triggered by the PVCs of the same morphology at the initial PVC (LBBB superior axis).

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  FIGURE 4. Ventricular fibrillation triggered by the same PVCs of the same morphology as the initial PVC.