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Figure 1 Fluorographic images of anatomic placement of the new 7-F, 6-mm-tip, quadripolar cryo catheter for the treatment of atrial flutter. (Top) Left anterior oblique view of right atrium. (Bottom) Right anterior oblique view of right atrium. ABI = cryo ablation catheter; AL 1 = anterolateral right atrial wall electrode; CS 1 = distal coronary sinus electrode; CS os = proximal electrode at coronary sinus os; HIS = His bundle catheter; MS 12 = midseptal electrode.