Why the study?
Does linear radiofrequency ablation across the isthmus between the outflow tract patch and the tricuspid annulus eliminate ventricular tachycardia in patients with repaired tetralogy of Fallot?
Does linear radiofrequency ablation across the isthmus between the outflow tract patch and the tricuspid annulus eliminate ventricular tachycardia in patients with repaired tetralogy of Fallot?
Linear radiofrequency ablation across the isthmus between the outflow tract patch and the tricuspid annulus is an effective strategy for eliminating ventricular tachycardia in patients with repaired tetralogy of Fallot, with bidirectional block serving as a reliable endpoint.
Answers are grounded in this paper and cite their sources.
Hypothesis-generating for isthmus ablation in repaired tetralogy of Fallot VT; prospective trials needed before clinical adoption.
INTRODUCTION: Ventricular tachycardia is commonly seen in patients following surgical repair for tetralogy of Fallot. The technique of ablation for this arrhythmia is not well defined. METHODS AND RESULTS: In two patients with ventricular tachycardia following surgical repair of tetralogy of Fallot, the traditional indicators for a site for ventricular tachycardia ablation did not yield cure. Based on careful mapping, the circuit was found to involve the isthmus between the outflow tract patch and the tricuspid annulus; linear radiofrequency lesions across this isthmus resulted in cure of ventricular tachycardia. Not only was the tachycardia no longer inducible, but bidirectional block at the line of ablation confirmed interruption of the reentrant circuit. CONCLUSION: A linear radiofrequency lesion was effective in eliminating ventricular tachycardia in both patients. The demonstration of bidirectional block confirms a cure independent of inducibility of ventricular tachycardia.
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Horton et al. (1997) studied this question.
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