Abstract

A 30-year-old woman with a history of atrioventricular nodal reentrant tachycardia (AVNRT) who underwent slow pathway modification at the age of 12 years presented with recurrent palpitations and presyncope for 1 year. She was found to have recurrent supraventricular tachycardia sensitive to adenosine and was referred for electrophysiology study and catheter ablation. Baseline electrocardiogram showed sinus rhythm and right bundle branch block, with no evidence of preexcitation. Electrophysiology study showed an atrial-His (AH) interval of 73 ms, a His-ventricular interval of 48 ms, and an RR interval of 876 ms.

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