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Figure 4 Another example of nonstationary re-entry with continuous wave breaks during fibrillation (2.5 µmol/l of ACh, data from tissue no. 9). (A to H) A re-entrant wave front with counterclockwise rotation and a moving core. (I) The trajectory of the tip of the re-entrant wave front. During re-entry with a moving core, continuous wave breaks were also observed. The double bars in B, E and H indicate the sites of spontaneous wave break. (J) The simultaneous pseudo-electrocardiogram recording reveals "fibrillation-like" activity. (K) A typical example of spontaneous wave breaks. Seven daughter wave fronts arose from a wave front of breakthrough. The wave fronts of breakthrough in parts A, G and K are marked by white squares.
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