Abstract
Case Summary A 47-year-old woman underwent electrophysiology study for recurrent episodes of documented paroxysmal supraventricular tachycardia (SVT) that used to terminate easily with adenosine. The electrocardiogram (ECG) during baseline was normal and that during clinical SVT was suggestive of atrioventricular nodal reentrant tachycardia (AVNRT). The basic intervals were normal and ventricular pacing showed concentric retrograde atrial activation sequence with evidence of ventriculoatrial (VA) block on adenosine. Atrial-His (AH) jump suggesting dual atrioventricular (AV) nodal physiology was seen on
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