The therapies available for Wolff-Parkinson-White syndrome have undergone an interesting development during the 20th century. The initial treatment for this syndrome included pharmacologic therapy together with vagal-stimulating maneuvers. Next was the surgical division of accessory pathways.1 More recently, innovative transcatheter methods for ablating accessory pathway conduction were devised.2-4 In many centers, radiofrequency (RF) ablation has changed the indications for surgery to include unsuccessful RF ablation or coexistent cardiac pathology that needs surgical intervention. This report documents our experience with endocardial dissection techniques after attempted RF ablation. © 1992.