Fibrillatory Wave Amplitude Evolution during Persistent Atrial Fibrillation Ablation: Implications for Atrial...

Area of Science:

• Electrophysiology
• Cardiology
• Medical Imaging

Background:

• Fibrillatory Wave Amplitude (FWA) is a non-invasive marker for atrial fibrillation (AF) complexity and predicts catheter ablation outcomes.
• The precise determinants of FWA are not fully understood.
• Investigating FWA's relationship with atrial substrate and AF spectral characteristics is crucial.

Purpose of the Study:

• To determine the influence of anatomical atrial substrate on FWA.
• To assess the impact of AF spectral characteristics on FWA.
• To clarify the role of FWA as a marker in AF.

Main Methods:

• Inclusion of persistent AF patients undergoing radiofrequency catheter ablation.
• Measurement of FWA on ECG and AF dominant frequency (DF) using Independent Component Analysis.
• Comparison of FWA with endocardial low-voltage areas, healthy atrial tissue surface, and P-wave amplitude.

Main Results:

• FWA remained stable during ablation, while DF significantly decreased.
• FWA correlated positively with the surface of healthy left atrial tissue and P-wave amplitude.
• FWA was higher in areas with less extensive low-voltage, indicating more viable tissue.

Conclusions:

• FWA is not associated with AF complexity but is primarily determined by the quantity of viable atrial myocytes.
• FWA should be interpreted as a marker of atrial tissue pathology rather than AF dynamics.
• These findings necessitate a re-evaluation of FWA's clinical application in AF management.