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A: The ablation catheter is positioned at the floor of the left atrial appendage (LAA) with inferiorly directed contact force during radiofrequency (RF) delivery. Asterisk (∗) indicates site of success. LLPV = left lower pulmonary vein, LUPV = left upper pulmonary vein. B: RF delivery at the floor of the appendage resulted in abrupt and durable loss of pathway conduction (white arrows highlight change in local atrioventricular signal).
