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Figure 9 Representative epicardial repolarization maps paced from the epicardium by S1-S2 method and plot of the restitution of action potential duration at each site (a to e) and superimposed optical action potentials at site b in control condition (A), and the Brugada-ECG condition with polymorphic ventricular tachycardia (PVT) (B) or ventricular fibrillation (VF) (C). APD₅₀ = action potential duration at 50% repolarization; DI = diastolic interval.