FIGURE 8.

Alternans magnitude and dispersion in heterogeneous sheets. (A) Maximum difference in APD between two successive action potentials. Inset shows magnification of onset of alternans with dashed lines indicating detection criteria of 1 ms and 10 ms. (B) Dispersion of APD. C: Maximum difference in CL between two successive action potentials. (D) Dispersion of CL. Solid symbols indicate the presence of a structural barrier, and open symbols indicate its absence. Triangles indicate spatially discordant alternans. “+SB” indicates presence of structural barrier, “−SB” indicates its absence.