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Functional substrate analysis in patients with persistent atrial fibrillation.

Pietro Rossi1, Michele Magnocavallo2, Filippo Maria Cauti3

  • 1Arrhythmology Unit, Isola Tiberina - Gemelli Isola, Rome, Italy. ptr.rossi@gmail.com.

Journal of Interventional Cardiac Electrophysiology : an International Journal of Arrhythmias and Pacing
|May 29, 2024
PubMed
Summary

Atrial electrogram duration map (AEDUM) and spatiotemporal electrogram dispersion (STED) identify atrial substrate in persistent atrial fibrillation (PsAF). These mapping methods reveal conductive dysfunction even with normal voltage, aiding ablation strategies.

Keywords:
AEDUMComplex fractionated atrial electrogramsElectrogram durationFunctional substrateLow voltagePersistent atrial fibrillationSpatiotemporal electrogram dispersion

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Imaging

Background:

  • Persistent atrial fibrillation (PsAF) ablation outcomes are significantly impacted by left atrial (LA) tissue remodeling and anisotropic conduction.
  • Understanding the electrical properties of the LA is crucial for effective treatment strategies.

Purpose of the Study:

  • To investigate the correlation between atrial electrogram duration map (AEDUM), spatiotemporal electrogram dispersion (STED), and low voltage areas (LVA) in patients with PsAF.
  • To assess the utility of AEDUM and STED in identifying areas of electrical dysfunction in the atria.

Main Methods:

  • Consecutive patients with PsAF undergoing pulmonary vein isolation were enrolled.
  • Voltage, AEDUM, and STED mapping were performed in all patients.
  • Correlations between these three mapping techniques were analyzed.

Main Results:

  • AEDUM and STED areas were frequently located on the LA roof, anterior wall, and septum.
  • AEDUM areas were significantly smaller than STED areas (p < 0.0001).
  • In 60% of patients, AEDUM areas were fully contained within STED areas; however, no correlation was observed with LVA in 7.5% of patients.

Conclusions:

  • AEDUM and STED mapping can identify areas of conductive dysfunction indicative of atrial substrate.
  • These mapping techniques are valuable for detecting electrical abnormalities even in the presence of normal atrial voltage.
  • Findings may inform and improve targeted ablation strategies for PsAF.