A young man underwent an electrophysiology (EP) procedure for recurrent supraventricular tachycardia (SVT). The recording obtained after induction of the tachycardia is shown in Fig. 21.1. Surface intracardiac recordings from the His bundle electrogram (HBE), mapping catheter (Map), coronary sinus (CS), and right ventricle (RV) are shown. What is the mechanism of the tachycardia?
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