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Figure 2 Electrophysiologic Profile of Induced Sustained VT in a Patient Who Presented With Repetitive PVCs
(A) Induction of sustained ventricular tachycardia (VT) with rapid ventricular pacing from the right ventricular apex (black arrows) during concomitant infusion of isoproterenol (ISO) (same patient as in Fig. 1). Note that the first beat of VT (fourth beat in the figure) represents pseudofusion between a ventricular pacing spike and the first beat of VT, and the fifth ventricular pacing spike (noncapture) occurs after the second beat of VT. (B) Termination of induced sustained VT with adenosine. HRA = high right atrium; PVC = premature ventricular contraction; RVA = right ventricular apex; RVP = right ventricualr pacing.
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