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Figure 2 Three types of activation observed in the right atrium (RA). Three surface electrocardiographic leads, 56 bipolar basket catheter electrograms and CS electrograms are shown. (Left) Homogeneously regular activation. During a homogeneously regular pattern, the entire RA was activated from a single wave front emerging from the high anteroseptal area (electrode B 1/2). (Middle) Nonhomogeneous activation. Type II and III atrial fibrillation (AF) are observed along the posterior and septal regions of the RA (splines A to D), whereas the lateral wall (splines G and H) is activated by type I AF. (Right) Homogeneously irregular activation. Complex activity (AF type II and III) is observed throughout the RA. Splines E and F were located across the tricuspid annulus.