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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
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Mapping multi-wavelet reentry without isochrones: an electrogram-guided approach to define substrate distribution.

Bryce E Benson1, Richard Carrick2, Nicole Habel3

  • 1University of Vermont College of Mathematics and Engineering, Burlington, VT, USA.

Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology
|November 2, 2014
PubMed
Summary
This summary is machine-generated.

Identifying local circuit density using electrogram frequency can guide ablation for atrial fibrillation. Map-guided ablation significantly reduced multi-wavelet reentry (MWR) duration compared to random ablation, demonstrating its superior effectiveness.

Keywords:
Atrial fibrillationCatheter ablationComputer-based modelElectrophysiology mapping

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Area of Science:

  • Computational electrophysiology
  • Cardiac electrophysiology
  • Medical device technology

Background:

  • Atrial fibrillation (AF) is often driven by multi-wavelet reentry (MWR).
  • Previous studies showed ablation in high-circuit-density regions reduces MWR duration and inducibility.
  • A method to identify local circuit density using electrogram frequency is needed.

Purpose of the Study:

  • To demonstrate a method for identifying local circuit density using electrogram frequency.
  • To validate the effectiveness of this method for map-guided ablation in a computer model of MWR.

Main Methods:

  • Simulated MWR in varying tissue properties (action potential duration, intercellular resistance).
  • Calculated electrograms using different electrode sizes and configurations.
  • Correlated tissue activation frequency and electrogram frequency (dominant and centroid) with circuit density using unipolar, contact bipolar, and orthogonal closed unipolar (OCU) configurations.
  • Used OCU centroid frequency maps to guide ablation to high-frequency regions.

Main Results:

  • Electrogram frequency correlated with tissue frequency and circuit density, dependent on electrode spatial resolution.
  • Map-guided ablation significantly reduced MWR duration (142 ± 174 s to 41 ± 63 s) compared to control groups.
  • OCU centroid frequency provided the highest resolution electrogram frequency map.

Conclusions:

  • Electrogram frequency accurately reflects circuit density in MWR when high spatial resolution electrodes are used.
  • Map-guided ablation targeting high-frequency regions is a superior strategy compared to no ablation or random ablation for reducing MWR.