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Figure 2 The actual activations registered in Figure 1. The numbers on the left edge of each panel indicate the electrode numbers and the location in the electrode array. Numbers 0.8 and 1.6 indicate the times in seconds, with the onset of data acquisition as time zero. In panel A, the activations of epicardial breakthrough (long arrow with asterisk) failed to travel across the site between channels 237 and 219, leading to conduction block and the initiation of reentry. The activations with corresponding activation times (ms) from channels 222 to 257 (solid circle followed by short arrows) illustrate part of the first cycle of the reentrant loop. Note that conduction delay (1208 – 1176 = 32 ms) was present when the wave front propagated through the site between channels 219 and 237. In panel B, these activations show that the reentrant excitations (long arrows) persisted for two rotations. Numbers 1 and 2 indicate the first and second reentrant cycles.