USE OF AN ORTHOGONAL ELECTRODE ARRAY TO IDENTIFY THE SUCCESSFUL ABLATION SITE IN RIGHT-VENTRICULAR OUTFLOW TRACT TACHYCARDIA

A novel approach to localize the origin of a right ventricular outflow tract tachycardia using an ablation catheter having an orthogonally o riented electrode array is described. Bipolar electrogram polarity rev ersal using minimally filtered (1-500 Nz) electrograms simultaneously acquired in two axes from the ablation catheter permitted accurate loc alization of the tachycardia focus. A single radiofrequency energy app lication at the site identified by this technique resulted in successf ul tachycardia ablation. This technique may facilitate mapping of any arrhythmia which can be modeled as arising from a point source.