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Consistency of the automatic algorithm in detecting complex fractionated electrograms using an electroanatomical

Wen-Chin Tsai1, Ji-Hung Wang, Yenn-Jiang Lin

  • 1Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.

Pacing and Clinical Electrophysiology : PACE
|July 24, 2012
PubMed
Summary

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This summary is machine-generated.

Algorithm settings significantly impact complex fractionated electrogram (CFE) detection during atrial fibrillation (AF) ablation. Using the average complex interval (ACI) algorithm with a 5-second recording duration optimizes CFE identification for substrate modification.

Area of Science:

  • Electrophysiology
  • Cardiac Arrhythmia Research
  • Medical Device Technology

Background:

  • The Carto system's automatic algorithm settings can influence the identification of complex fractionated electrograms (CFEs) during atrial fibrillation (AF).
  • Variations in algorithm parameters may affect the accuracy and consistency of CFE detection.

Purpose of the Study:

  • To evaluate how different algorithm parameters impact CFE detection.
  • To assess the efficacy of substrate modification guided by CFEs after pulmonary vein isolation (PVI).

Main Methods:

  • Analysis of 1,159 electrograms from 11 AF patients.
  • Investigated effects of high-voltage thresholds, detection algorithms (ACI vs. interval confidence level), and recording duration (2.5s vs. 5s) on CFE detection.

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Main Results:

  • CFE proportion varied with detection algorithm and recording duration.
  • High-voltage thresholds did not affect CFE consistency.
  • High-grade CFEs were most consistent using the ACI algorithm and 5-second recordings (Cronbach's alpha = 0.952).
  • PVI with high-grade CFE site ablation successfully converted AF to sinus rhythm in 8/11 patients.

Conclusions:

  • CFE detection consistency depends on the algorithm and recording duration, not high-voltage thresholds.
  • The ACI algorithm with a 5-second recording duration provides the most consistent detection of high-grade CFE sites.