Pacing site and bradycardia dependent retrograde conduction block over an atrioventricular accessory pathway

Rong Bai, Massimo Tritto, Luigi Di Biase, Jorge A. Salerno-Uriarte

Research output: Contribution to journalArticle

3 Scopus citations


Intermittent retrograde conduction over an accessory pathway (AP) is an uncommon phenomenon. We report a case of Wolff-Parkinson-White syndrome in which retrograde conduction of the bypass tract was present only during right ventricular (RV) outflow tract and left ventricular pacing or during RV inflow tract pacing with a fast pacing rate (pacing site and bradycardia dependent conduction block). The interaction between different branches/fibres of the bypass tract might explain the mechanism of this phenomenon. The AP was successfully ablated at the lateral aspect of mitral valve annulus. It is suggested that careful evaluation by decremental ventricular stimulation should be applied from multiple sites both during baseline study and after apparent AP ablation in order to detect such uncommon cases of intermittent conduction.

Original languageEnglish (US)
Pages (from-to)438-442
Number of pages5
Issue number6
StatePublished - Jun 1 2006
Externally publishedYes



  • Atrioventricular accessory pathway
  • Catheter ablation
  • Pacing site dependent
  • Phase 4 block
  • Retrograde conduction

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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