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Related Experiment Videos

Characterization of junctional rhythm after atrioventricular node ablation

J F Alison1, J A Yeung-Lai-Wah, M Schulzer

  • 1Department of Medicine, University of British Columbia, Vancouver, Canada.

Circulation
|January 1, 1995
PubMed
Summary

Radiofrequency ablation of the atrioventricular (AV) node creates a stable junctional escape rhythm (JER) in most patients. This study suggests the JER originates in the His bundle, not the AV node, with no lasting thermal effects from ablation.

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Area of Science:

  • Electrophysiology
  • Cardiology
  • Medical Device Technology

Background:

  • Catheter ablation of the atrioventricular (AV) node using radiofrequency current (RFC) frequently results in a junctional escape rhythm (JER).
  • The precise origin of the JER and the short-term thermal impact of RFC on this pacemaker activity remain incompletely understood.

Purpose of the Study:

  • To investigate the electrophysiological characteristics of the JER following AV nodal ablation with RFC.
  • To determine the origin of the JER and assess the long-term thermal effects of RFC on junctional pacemaker activity.

Main Methods:

  • Electrophysiological assessment of 45 patients post-AV nodal ablation with RFC.
  • Evaluation of JER characteristics via short-term and long-term follow-up studies.
  • Assessment of responses to overdrive ventricular pacing, atropine, and isoproterenol infusion.

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Main Results:

  • A stable JER was observed in 98% of patients at long-term follow-up, with a significantly shorter cycle length compared to the short-term setting (1426 ± 223 ms vs. 1526 ± 298 ms).
  • No significant differences were found in junctional recovery times or drug responses between short-term and long-term assessments, except at the highest isoproterenol dose.
  • HV intervals remained unchanged post-ablation, suggesting the pacemaker focus is proximal to the central fibrous body.

Conclusions:

  • AV nodal ablation with RFC leads to a stable, long-term JER, likely originating from the proximal His bundle.
  • The observed drug response patterns support an origin within the proximal His bundle at its junction with the AV node.
  • The similarity in short-term and long-term junctional pacemaker activity suggests RFC does not cause reversible thermal damage to this focus.