The relationship between electrogram cycle length and dominant frequency in patients with persistent atrial...

Area of Science:

• Cardiac Electrophysiology
• Atrial Fibrillation Ablation
• Medical Device Technology

Background:

• Persistent atrial fibrillation (AF) management often involves catheter ablation.
• Complex fractionated atrial electrograms (CFAE) and high dominant frequency (DF) sites are proposed ablation targets.
• The relationship between CFAE-derived mean cycle length (MCL) and DF in persistent AF remains unclear.

Purpose of the Study:

• To investigate the correlation between electrogram mean cycle length (MCL) and dominant frequency (DF) in patients with persistent atrial fibrillation.
• To determine if these electrophysiological markers identify similar regions in the left atrium post-pulmonary vein isolation.

Main Methods:

• Analysis of 9,262 electrograms from 44 patients with persistent AF after pulmonary vein isolation.
• Electrograms were mapped using a multielectrode catheter throughout the left atrium.
• Mean cycle length (MCL) and dominant frequency (DF) were calculated using spectral analysis (fast Fourier transformation).

Main Results:

• A weak but statistically significant correlation (r = 0.21, P < 0.001) was observed between MCL and DF across all analyzed electrograms.
• Individual patient analysis revealed a poor correlation, with r values ranging from -0.18 to 0.47.
• Average MCL was 135 ± 24 ms and average DF was 6.1 ± 0.6 Hz post-pulmonary vein isolation.

Conclusions:

• There is a poor correlation between electrogram MCL and DF in patients with persistent AF.
• Ablation strategies targeting DF and CFAE are unlikely to focus on the same left atrial sites.
• Further comparative studies are needed to evaluate the efficacy of DF- versus CFAE-guided ablation for persistent AF.