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Figure 4 Occurrence of T-wave alternans after administration of pilsicainide in case 4. (a) shows control electrocardiogram before administration of pilsicainide. (b) shows premature ventricular contraction (PVC) and manifest T-wave alternans in right precordial leads after administration of pilsicainide: PVC occurred on a deep inverted T wave. Arrows = larger inverted T wave in lead V₂.