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Figure 7 Histologic findings corresponding to activations shown in Figure 1. Panels A, C, D and E show sections of the left ventricular myocardium parallel to the epicardium in heart no. 1. With trichrome stain, small veins with perivascular fibrosis (blue areas) were clearly seen in panel C (arrows). The magnified view (panel E) also showed interstitial and replacement fibrosis. The areas of fibrosis in panels C and E corresponded to the line of conduction block in panel B (same frame as Fig. 1B). However, in the areas without conduction block, histologic examination showed either normal tissue (panel A) or mild fibrosis (panel D). Original magnification 10x, panels A, C and D; 100x, panel E. Calibration lines 1 mm.