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Figure 1 (A) Photograph of the cryothermal balloon catheter. (B) Fluoroscopic image of the inflated balloon engaged at the left superior pulmonary vein (LSPV) orifice (arrows). (C) Intracardiac echocardiographic image of the inflated balloon positioned at the orifice of the LSPV (arrow), illustrating an example of an unsuccessful occlusion of the pulmonary vein orifice, with a peri-balloon flow leak as seen by color Doppler flow. LAO = left anterior oblique projection; RAO = right anterior oblique projection.