Spatiotemporal characterization of atrial activation in persistent human atrial fibrillation: Multisite electrogram analysis and surface electrocardiographic correlations-A pilot study

Samer R. Dibs, Jason Ng, Rishi Arora, Rod S. Passman, Alan H. Kadish, Jeffrey J. Goldberger

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Background: The mechanisms of persistent human atrial fibrillation (AF) are not well understood. Objective: The purpose of this study was to examine whether left atrial (LA) drivers are present in persistent AF by performing a comprehensive evaluation of atrial activation frequency and organization using multisite atrial recordings and correlating the findings with atrial waveform frequency and organization on surface ECG. Methods: Nine patients undergoing catheter ablation for persistent AF were studied. Electrograms were recorded from at least 10 sites in each atrium, tagged to an electroanatomic map, and subjected to spectral analysis. Dominant frequency (DF) and regularity index were calculated at each site. Surface ECG recordings were analyzed to obtain precordial lead DFs and AF vector stability index. Results: Mean, maximum, and minimum DF and mean regularity index were higher in LA than right atrium (RA). DF was correlated with regularity index (R = 0.59, P <.0001) and negatively correlated with distance from maximal DF site (R = -0.80, P <.0001). Precordial lead DFs were highly correlated with atrial DFs. Vector stability index was 0.39 ± 0.12 (P <.01 vs predicted if AF vector direction was random). LA-RA DF gradient and vector stability index were negatively correlated (R = -0.83, P <.05). Conclusion: The existence of LA-RA frequency gradients in most patients in this study along with the regularity of LA activation and centrifugal dissipation of activation frequency suggest that LA drivers are often present in persistent AF. Analysis of AF vectors from surface ECG demonstrates spatial stability and correlates with intracardiac recordings. These findings may have implications for catheter ablation of persistent AF.

Original languageEnglish (US)
Pages (from-to)686-693
Number of pages8
JournalHeart rhythm
Volume5
Issue number5
DOIs
StatePublished - May 1 2008
Externally publishedYes

Keywords

  • Atrial fibrillation
  • Dominant frequency
  • Regularity index
  • Spatiotemporal organization
  • Spectral analysis
  • Vector stability index

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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