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Example of a spiral wave initiation. (A) Temporary line of block (green line). (B) Activation during the first 150 ms, after pacing near the mitral ring, with the block line in place. (C) The next 140 ms, after the block line was removed. Activation first crosses the former block line in the area between the superior pulmonary veins. (D–F) The next two cycles of the reentry. The colorbar indicates the activation time, and the scales are in milliseconds.
