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Figure 3 Successful cryo-ablation (CA) with His potential in ventricular tachycardia (Patient #31). (A) Electrocardiogram shows the initiation of cryo-mapping (CM). The His potential is clearly seen on the ablation catheter. (B) Fluoroscopic images in the antero-posterior view shows the position of the cryo-ablation catheter being very near the His bundle. The catheter is just under the aortic valve along the left ventricular septum via retrograde approach through the aortic valve. ABL = ablation; HBE = His bundle electrogram; HRA = high right atrium.