Spatiotemporal organization of the left atrial substrate after circumferential pulmonary vein isolation of atrial fibrillation

Yenn Jiang Lin, Ching Tai Tai, Tsair Kao, Shih Lin Chang, Li Wei Lo, Ta Chuan Tuan, Ameya R. Udyavar, Wanwarang Wongcharoen, Yu Feng Hu, Han Wen Tso, Wen Chin Tsai, Chien Jung Chang, Kuo Chang Ueng, Satoshi Higa, Shih Ann Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

Background-There is a paucity of data regarding the mechanism of maintaining atrial fibrillation (AF) after pulmonary vein isolation (PVI) in patients with AF. The aim of this study was to examine the impact of circumferential PVI on the left atrial (LA) substrate characteristics. Methods and Results-Seventy-two AF patients (age, 53±11 years) underwent mapping and catheter ablation using an NavX system. The biatrial characteristics such as the complex fractionated atrial electrograms (CFEs; based on fractionated intervals) and frequency analysis (based on dominant frequencies) were mapped before and after PVI. PVI with electric isolation was performed in all patients. In the 45 patients who did not respond to PVI, the continuous CFEs (>8 seconds, 18±18% and 12±17% of the LA sites, before and after PVI, respectively, P=0.02), degree of LA fractionation (mean fractionated interval: 75.6±14.3 msec versus 87.3±16.7 msec, P=0.001), and mean LA dominant frequencies (6.92±0.88 Hz versus 6.58±0.91 Hz, P=0.001) decreased after PVI. Complete PVI altered the distribution of the CFEs toward the LA anteroseptum, mitral annulus, and LA appendage regions. A persistent presence of continuous CFEs in the vicinity of the dominant frequencies sites (observed in 53% patients) correlated with a higher procedural AF termination rate for the CFE ablation (63% versus 23%, P<0.05). Conclusions-Complete PVI eliminated some CFEs in the LA and altered the distribution of the CFEs. The persistent presence of CFEs before and after PVI in the vicinity of the high frequency sites is important for AF maintenance after PVI.

Original languageEnglish
Pages (from-to)233-241
Number of pages9
JournalCirculation: Arrhythmia and Electrophysiology
Volume2
Issue number3
DOIs
StatePublished - Jun 2009

Keywords

  • Atrial fibrillation
  • Electrogram frequency analysis
  • Left atrium

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