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Figure 1 Three-dimensional reconstructionof the left atrium from a patient with a focal tachycardia originating on the interatrial septum anterior to the ostium of the right superior pulmonary vein (RSPV) (Patient #6). (Panels 1 to 3) Activation map during tachycardia, with earliest activation displayed in red and latest in violet. Local unipolar electrogram with a QS pattern is shown in panel 2, corresponding to the site of successful ablation. (Panels 4 to 9) Propagation map in right anterior oblique (RAO) showing centrifugal spread from site of earliest activation. AP = antero-posterior; LAA = left anterior appendage; LAO = left anterior oblique; LIPV = left inferior pulmonary vein; LSPV = left superior pulmonary vein; MV = mitral valve; RIPV = right inferior pulmonary vein.