Abstract 12271: Radiofrequency Ablation With Electrode in Contact With Circular Mapping Catheter: Coagulation, Char, and Pop Ocurrence Comparison With Two Types of Irrigated Ablation Catheters

Introduction: A circular mapping catheter (CMC, Biosense Webster Lasso® Catheter) is frequently used in radiofrequency (RF) ablation treatment of atrial fibrillation to aid in determining ablation targets, such as the pulmonary vein ostia. During RF delivery, the ablation electrode is often in close proximity and may sometimes be in contact with one of the electrodes of the CMC. In this study, we compare coagulation, tissue char, and pop occurrence for ablations in contact with a CMC electrode versus ablations without a CMC. Ablations were performed with open-irrigation ablation electrodes of the Biosense Webster ThermoCool® Catheter (6 hole) and ThermoCool® SF Catheter (56 hole). Hypothesis: There will be more coagulation formation when there is contact with CMC. Methods: The thigh muscles of 4 anesthetized pigs were exposed and a skin cradle created. A 6 hole or 56 hole catheter was placed on the muscle with 10g of force in perpendicular orientation. Some ablations were performed with the ablation cathe...