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Inferolateral J-wave syndrome due to abnormal depolarization. The maps (middle) show activation mapping, with blue indicating the latest activated regions, here the inferobasal right and left ventricles. Right: Low-voltage fragmented electrograms (Egms) coincident with J wave are only present in the inferior right ventricle (white contour) compared with Egms in the inferior left ventricle. Left: The 12 lead-ECG in a 31 year- old man who survived VF. ECG = electrocardiogram.
