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Figure 2 Examples of different patterns of AF. Left panel (A S): The atrial activation is regular in the lateral and posterior wall in the right atrium and in the CS, with a definite single electrogram. The activation sequence is clearly craniocaudal in the RL wall. The septal region, both right (especially mid and low) and left, shows disorganized atrial activity with double, fragmented electrograms. Middle left panel (B RP, S): Atrial activation is regular in the lateral wall, where a craniocaudal sequence is evident, and in the CS. In contrast, the RS, LS and RP wall show irregular atrial activation with fragmented, double and low amplitude atrial electrograms. Right middle panel (C CS, RP, S): The activation sequence is almost regular in the RL wall, with a craniocaudal sequence, whereas in the other sites (RP wall, septum and CS), fragmented and double electrograms are present. Right panel (D): All recording sites show very irregular, disorganized atrial activation. RAN = right anterior wall; RL = right lateral wall; RPL = right posterolateral wall; RP = right posterior wall; RPS = right posteroseptal wall; RS = right septum; RAS = right anteroseptal wall; LHS = left high septum; LMS = left mid septum; LLS = left low septum; DCS = distal coronary sinus; PCS = proximal coronary sinus; II = lead II electrocardiogram; S = septum (both right and left); LS = left septum. Each pair of electrodes of the basket catheter is identified by a number: 1 = most distal (superior); 4 = most proximal (inferior) on the spline. At the bottom of each panel, a 7-s electrocardiographic strip is shown; the space between the vertical lines corresponds to the endocavitary signals.
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