Abstract
A 75-year-old woman underwent a diagnostic electrophysiology study because of a recurrent, symptomatic, drug-refractory supraventricular tachycardia (SVT). The 12-lead electrocardiogram showed only mild PR prolongation. Atrio-His and His-ventricular intervals measured 140 and 45 ms, respectively. She demonstrated retrograde ventriculoatrial activation that was earliest at the anteroseptum and decremental. Single atrial extrastimulation and spontaneous atrial premature depolarizations (APDs) repeatedly induced a short RP SVT.
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