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Figure 5 Snapshots of a color optical isopotential movie on the epicardial surface for the continuous two beats with (Beat 2) and without (Beat 1) a phase 2 re-entrant extrasystole (P2R-extrasystole) in the Brugada-ECG condition (A). Depolarization map of a P2R-extrasystole (B) and optical action potentials at each site (a to f) and transmural electrocardiogram (ECG) (C). Please see the for accompanying video.