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Three-dimensional mapping image and ventricular tachycardia (VT) morphologies on surface 12-lead electrocardiogram. A: The abnormal potentials in right anterior oblique (RAO) and caudal views of the left ventricle. Blue tag indicates isolated delayed potential, sky blue tag indicates isolated very delayed potential, and orange tag indicates local abnormal ventricular activity. B: Three VT morphologies on a surface 12-lead electrocardiogram.
