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Figure 3 Left Atrial Macro-Reentrant Tachycardia

(A) Surface electrocardiogram demonstrates atrial tachycardia at a rate of 150 beats/min. (B) Activation maps demonstrate the tachycardia using an isthmus in the left atrium (LA), just anterior to the left superior pulmonary vein (LSPV), involving the donor, but not native (gray) left atrium (LA cuff tachycardia). Red marks represent ablation lesions. (C) Fluoroscopic left anterior oblique view: this tachycardia was mapped and ablated with transseptal catheterization. ABL = ablation catheter; CS = coronary sinus; LAT = left atrial tachycardia; LIPV = left inferior pulmonary vein; RA = right atrium; SCR = native atrium tagged as "scar" and shown in gray.