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Figure 2 An example of electroanatomic mapping (CARTO) of a patient with permanent atrial fibrillation. (A) Complex fractionated atrial electrograms (CFAE) are seen over the right atrial (RA) septum_1–2 and RA septum_3–4; in contrast, the lateral wall of the RA shows discrete organized single-potential atrial electrograms (RA_1–2 and RA_3–4). (B) Electroanatomic mapping voltage map presents the posteroanterior view. Pink dots are areas of CFAEs along both sides of the atrial septum. (C) Left anterior oblique view of the CARTO voltage map displaying ablation points (red dots). Left atrial (LA)_1–2 and LA_3–4 are the intracardiac recordings from the superior-anterior aspect of the interatrial septum (arrow). (D) Termination of the tachycardia during the ablation. LIPV = left inferior pulmonary vein; RIPV = right inferior pulmonary vein; RSPV = right superior pulmonary vein.