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Figure 1 Comparison of ECG Morphologies of Clinical PVC and Induced Sustained VT From a Patient Who Presented With Repetitive PVCs

(A) 12-lead electrocardiogram (ECG) of a sinus beat followed by a premature ventricular contraction (PVC). (B) 12-lead ECG of induced sustained ventricular tachycardia (VT) from the same patient.