Journal of Arrhythmia (Oct 2014)

Shortening of intraventricular conduction time with rapid ventricular pacing

  • Naoko Sasaki, MD,
  • Ichiro Watanabe, MD,
  • Yasuo Okumura, MD,
  • Kazumasa Sonoda, MD,
  • Rikitake Kogawa, MD,
  • Keiko Takahashi, MD,
  • Kimie Ohkubo, MD,
  • Toshiko Nakai, MD,
  • Atsushi Hirayama, MD

DOI
https://doi.org/10.1016/j.joa.2013.10.005
Journal volume & issue
Vol. 30, no. 5
pp. 372 – 375

Abstract

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Background: Supernormal conduction (SNC) of the human ventricular myocardium has been reported, but its mechanism remains controversial. Methods: We recorded monophasic action potentials during rapid ventricular pacing from the right ventricular endocardium in 24 patients with supraventricular tachyarrhythmias who underwent catheter ablation. Results: In 7 of 24 patients, shortening of the QRS duration was observed at a pacing cycle length ≤400 ms and lengthening of the QRS duration was observed in 3. Conclusions: Shortening of the QRS duration during rapid ventricular pacing was observed in the patients.

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