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Current RF ablation technology is limited by small lesion size. In order to enhance the size of RF-induced LV (left ventricular) endocardial lesions, the effects of an enlarged distal electrode tip and increased RF power on lesion volume were evaluated. Steerable electrode catheters with distal electrode tips of 4-12 mm were studied in anesthetized dogs at power settings of 20-100 W. Temperature was...