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Figure 2 Successful circumferential cryoablation of the left superior pulmonary vein. (A) Fluoroscopic image of the Lasso catheter positioned at the pulmonary vein (PV) ostium. (B) Tracings of the surface electrocardiographic leads I and III and PV ostial electrograms as seen by the Lasso catheter (PV_1-2 to PV_10-1) during distal coronary sinus pacing, and recorded before ablation (left) and after ablation (right). LA = left atrium; other abbreviations as in Figure 1.