Coherent mapping helps identify abnormal potentials and improves the treatment of multiple ventricular tachycardia: A case report

Figures

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  Figure 1. 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.

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  Figure 2. Coherent map integrated with voltage and vector map. A: Slow conduction area was observed (arrow) in the right anterior oblique (RAO) view. An isolated delayed potential was observed at site A. B: Slow conduction areas were observed in the caudal view, and isolated delayed potentials were observed at sites B and C (arrows). The bipolar voltage map settings were as follow: scar area was defined as less than 0.10 mV, low voltage area was defined as 0.10 to 1.00 mV, and the normal voltage area was defined as over 1.0 mV.

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  Figure 3. Each ventricular tachycardia (VT) morphology, electrophysiological study, and ablation point. A, B: The left sections show morphologies of surface 12-lead electrograms and local intracardiac electrograms during pace mapping at sites A and B, respectively. The right sections show VT 1 and VT 2 morphologies, respectively, on surface 12-lead electrograms. C: Twelve-lead electrograms and local intracardiac electrograms during entrainment pacing at site C during VT 3. D: Ablation points in right anterior oblique (RAO) view (top image) and in caudal view (bottom image). Red tags indicate ablation points.