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Ablation of Ventricular Tachycardia Associated with Tetralogy of Fallot: Demonstration of Bidirectional Block |
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| Authors: | RODNEY P HORTON MD ROBERT C CANBY MD DAVID J KESSLER MD JOSE A JOGLAR MD REW HUME MD MICHAEL E JESSEN MD WILLIAM P SCOTT MD RICHARD L PAGE MD |
| Institution: | Department of Internal Medicine, Division of Cardiology;Department of Surgery, Division of Cardiovascular and Thoracic Surgery;Department of Pediatrics. Division of Cardiology, The University of Texas Southwestern Medical Center, Dallas, Texas |
| Abstract: | Ablation of VT in Tetralogy of Fallot. 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. |
| Keywords: | ventricular tachycardia tetralogy of Fallot radiofrequency ablation bidirectional block |