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Figure 3 Pathological sections of infarcted hearts of various transmural extensions and their respective reconstructions (viewed from a left anterior oblique projection). The superimposed colors in the reconstruction depict bipolar electrogram amplitude (BEA) (purple indicating values >6.1 mV; red indicating values <2.1 mV). Beneath the reconstructed sections are typical recordings of unipolar electrogram and derivatives, unipolar electrogram amplitude (UEA) and slew rate (SR) and bipolar electrogram and amplitude from selected points at the core of the infarcted region (the distance between two white marks on the electrogram time scale denotes a 50-ms period). (A) Section obtained from the apical third of a left ventricle, in which subendocardial infarction (mean transmurality = 23%) is present; (B) Infarction of intermediate transmurality (mean transmurality = 44%). This section was obtained from the basal third of the left ventricle. (C) An example of a section obtained from the midventricle that demonstrates a transmural infarct (mean transmurality = 84%). The corresponding endocardial impedance values are 186.4  (A), 172.8 (B), and 144.3 (C).
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