Abstract
Case presentation A 44-year-old man with recurrent palpitations and electrocardiogram-documented long RP interval supraventricular tachycardia despite metoprolol therapy underwent diagnostic electrophysiologic evaluation. His resting 12-lead electrocardiogram was normal. During sinus rhythm, atrio-His (AH) and His-ventricular intervals measured 51 and 39 ms, respectively. Antegrade dual atrioventricular (AV) nodal physiology was not observed. In the baseline state, tachycardia could not be induced but on isoproterenol, the patient
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