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Figure 6 Figure-eight reentry in a patient with atypical AF. The zone of slow conduction is located in the posterior RA (splines E and F). Crowded isochrones alongside splines D and F indicate functional lines of block. A, The exit of impulse from the common pathway. B, Impulse propagation in two loops located in the posterolateral (splines C and D) and septal regions (splines G and H) of the RA and merge of both wavefronts at the level of electrode pairs E5–6 and F5–6. C, Activation through the common pathway located in the posterior wall. The cycle length of the AF was 166 ms.
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