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Figure 2 Fluoroscopically optimal image of the balloon and the inferior pulmonary vein in the anteroposterior projection. Multiple arrows indicate the inflated balloon filled with a mixture of saline solution and contrast medium. An occlusive pulmonary venogram confirms that the balloon is firmly wedged into the pulmonary vein ring. ABL = ablation; CS = coronary sinus electrode catheter; PC = pigtail catheter; PV = inferior pulmonary vein.