Figure 3.
Maps of the shock-induced change in transmembrane potential, ΔVm, at the end of the 10-ms shock on the intramural reference plane (top row) and on the cut surface (middle row) for three wedge preparations with different fiber orientation. (A) Fibers oriented parallel to the cut surface (arrow). (B) Fibers oriented perpendicularly to the cut surface (circle and dot). (C) Fibers rotating transmurally as shown in Fig. 2. In all three cases, impermeable boundary conditions are enforced on the cut surface. Field strength, E, is 28 V/cm. Plots of ΔVm profiles (red and blue lines) along the dotted line (direction epi- to endocardium) in the middle of the ΔVm maps are presented at the bottom. Vertical lines delineate areas of zero ΔVm and their locations with respect to the epicardium.