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Figure 6 Analysis of consecutive activation patterns during a representative episode of spontaneous onset of atrial fibrillation (AF). (A) Pulmonary vein recordings from a basket catheter placed in the right superior pulmonary vein during an episode of spontaneous onset of AF from F 5–6. The numbers identify the conduction times from the earliest activation potential. (B) In this case, rapid, repetitive firings induce the pulmonary vein (PV)-left atrium (LA) conduction block and PV-LA reciprocating re-entrant circuit involving the exit breakthrough point (splines A and B), and the entrance breakthrough point (spline F) is created. Also, a re-entrant circuit lasting for 1.5 rotations, with a cycle length of 100 ms, is observed within the PV.
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