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Figure 2 Wavefront propagation recorded by optical mapping. (A) The S1 (cycle length [CL] = 700 ms) wavefront propagated relatively fast and homogeneously across the preparation. (B) In contrast, the S2 (coupling CL = 225 ms) wavefront propagated slower and took a counterclockwise course as conduction block was encountered. The numeric sequence indicates progressive times of propagation. Arrows indicate the site of stimulation. Frames are 32 ms apart. White dots outline the margin of the preparation. Stars indicate the leading edge of wavefront. Abbreviations as in Figure 1.
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