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Figure 4 Endoscopic View of MDCT and Isochrone Map During Sinus Rhythm
(A and B) Location of a line of conduction block with double potentials (gray zone) marked on a 3-dimensional isochrone map during sinus rhythm in anteroposterior and posteroanterior view, respectively. (C) A 3-dimensional volume rendering technique of left atrial (LA) image, based on multidetector computed tomography (MDCT) in anteroposterior projection, that corresponds to (A). The orientation of the muscular bundles (yellow arrows) corresponds to the line of conduction block (gray zone) in (A). (D and E) Muscular bundles by the endoscopic view of MDCT. (D) The muscular bundles (red arrows) originate in the septum, extend near the fossa ovalis (white arrow), insert upward into the anterior roof, and spread down the posterior wall. In (E), the muscular bundle (red arrows) courses along the septal border of the right superior pulmonary vein (RSPV) ostium to the anterior roof. This location corresponds to the line of conduction block identified during sinus rhythm (A and B). LAA = left atrial appendage; other abbreviations as in Figure 2.
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