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Premature atrial complex ablation. A: Activation mapping of the right atrium (RA) and left atrium (LA) is notable for earliest site of activation along the inferoseptal tricuspid annulus, with radial spread. The RA and LA are projected in a left anterior oblique view. The dashed circles indicate the location of the tricuspid annulus (TA) and mitral annulus (MA). B: The bipolar electrogram at the site of earliest activation is fractionated and precedes the onset of the P wave by 33 ms.
