Narrow QRS Tachycardia with Transition: What Is the Mechanism?

Pacing Clin Electrophysiol. 2016 Sep;39(9):1016-7. doi: 10.1111/pace.12902. Epub 2016 Jul 1.

Abstract

A 50-year-old woman underwent radiofrequency catheter ablation of narrow QRS tachycardia that was terminated with intravenous adenosine. Twelve-lead electrocardiogram was normal during sinus rhythm. The electrophysiological study showed normal atriohisian and hisioventricular intervals during sinus rhythm. Atrial burst pacing reproducibly induced two narrow QRS tachycardias. Figure 1 shows spontaneous switch of tachycardia 1 to tachycardia 2. What are the likely mechanisms of the tachycardia and the transition?

Keywords: AV nodal reentry; AV reentry; transition.

Publication types

  • Case Reports

MeSH terms

  • Catheter Ablation
  • Diagnosis, Differential
  • Disease Progression
  • Electrocardiography / methods*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Tachycardia, Atrioventricular Nodal Reentry / diagnosis*
  • Tachycardia, Atrioventricular Nodal Reentry / surgery*
  • Tachycardia, Ventricular / diagnosis*
  • Tachycardia, Ventricular / surgery*
  • Treatment Outcome