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Figure 3 Posteroanterior (PA) and lateral (Lat) radiographs and electrograms during mapping for and ablation of the typical variety of AV node reentry tachycardia in Patient 9. (Bottom Left) The ablation catheter (Abl) was first used to identify the region of the His bundle using the retrograde aortic approach. (Bottom Right) The successful ablation site (Abl) of the "slow" inputs to the AV node. Radiographs on the left are lower magnification than those on the right. Baff = systemic venous baffle multipole catheter. Bipole 4 is most superior and bipole 7 most inferior; HLA = high anatomic left atrial catheter; LV = left ventricular catheter; PSRA = posteroseptal right atrial catheter. The electrograms are from the most proximal bipole. See text for details.