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Summary
This summary is machine-generated.

Novel omnipolar electrograms (EGMs) capture maximal voltages during atrial fibrillation (AF) ablation, overcoming limitations of bipolar EGMs. This technique is unaffected by wavefront direction, collision, or fractionation, improving AF substrate characterization.

Keywords:
atrial fibrillationcardiac electrophysiologycatheter ablationomnipolesvoltage mapping

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Area of Science:

  • Electrophysiology
  • Cardiovascular Research
  • Medical Device Technology

Background:

  • Low-voltage-guided substrate modification is an emerging strategy for atrial fibrillation (AF) ablation.
  • Bipolar electrogram (EGM) analysis in AF is limited by lower peak-to-peak voltage (Vpp) due to wavefront direction, fractionation, and collision.
  • Current bipolar EGM analysis faces challenges in accurately assessing AF substrate due to signal variability.

Purpose of the Study:

  • To compare peak-to-peak voltages from bipolar EGMs with novel omnipolar peak-to-peak voltages (Vmax).
  • To evaluate the impact of electrode orientation on bipolar EGM voltages in sinus rhythm (SR) and AF.
  • To assess the ability of omnipolar EGMs to overcome limitations of bipolar EGMs in AF.

Main Methods:

  • A high-density multielectrode plaque was placed on the epicardial surface of canine left atria.
  • Bipolar EGMs (horizontal and vertical orientations) and omnipolar EGMs were recorded in SR and AF.
  • Vector field analysis was used to analyze AF wavefronts and EGM characteristics.

Main Results:

  • Bipolar EGM voltages were significantly influenced by electrode orientation in both SR and AF.
  • Omnipolar Vmax values were substantially larger than bipolar voltages in both SR and AF (P<0.001).
  • Vector field analysis confirmed omnipolar EGMs accurately record voltages unaffected by wavefront collision and fractionation.

Conclusions:

  • Omnipolar EGMs provide maximal voltage measurements from AF signals.
  • Omnipolar EGMs are not influenced by directional factors, collision, or fractionation, unlike bipolar techniques.
  • Omnipolar EGMs offer a more robust method for AF substrate characterization compared to bipolar EGMs.