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Figure 2 (A) This figure displays a user-defined map of a view of the septal aspect of the left ventricle (LV) and shows the LV outflow tract and part of the mitral valve annulus (MVA). The map is color-coded according to the measured electrogram (EGM) width. Three EGMs are displayed. Two of them have isolated potential (sites #1 and #3; isolated potentials are indicated by arrows) and represent the widest EGMs identified in this patient. Sites at which fragmented EGMs without isolated potentials are recorded separate them (site #2). The different EGM widths are indicated below the EGMs. Areas with isolated potentials are marked in blue, areas with fragmented electrograms are marked in white, and the area where the His was recorded is indicated as orange dots. The map was obtained in a patient who had an inferior wall myocardial infarction 30 years before the mapping study. (B) The scheme represents the same view as outlined in panel A. The cross-hatched area corresponds to areas with low-voltage EGMs and the black area represents the area where EGMs are broader than 200 ms. Areas in white correspond to sites with higher voltage EGMs (>1 mV). (C) This figure illustrates a voltage map of the same view shown in panels A and B. Low-voltage areas are differentiated from higher voltage areas.
