Correlation between conduction velocity and frequency analysis in patients with atrial fibrillation using...

Area of Science:

• Electrophysiology
• Cardiac Arrhythmias
• Medical Imaging

Background:

• Spectral analysis of atrial signals aids in identifying regions of interest during atrial fibrillation (AF).
• The precise relationship between dominant frequency (DF) mapping and the underlying atrial substrate, specifically zones of slow conduction (SZ), remains unclear.
• Novel noncontact mapping systems offer new ways to analyze atrial electrical activity.

Purpose of the Study:

• To compare regions of dominant frequency (DF) with zones of slow conduction (SZ) in the left atrium (LA) during AF.
• To evaluate the relationship between DF, DF ratio (DFR), and SZs in different regions of the LA.
• To assess the reproducibility of SZ location compared to DF and DFR.

Main Methods:

• Nineteen patients with AF underwent simultaneous noncontact mapping using unipolar charge density signals to determine DF.
• A validated algorithm assessed conduction during AF, identifying SZs.
• SZs were compared to DF and DFR across five distinct regions of the LA.

Main Results:

• The reproducibility of SZ location was higher than that of DF or DFR across different time measurements.
• Zones of slow conduction (SZs) were predominantly located on the anterior and posterior walls of the LA.
• No statistically significant correlation was found between SZs and DF or DFR throughout the atrium.

Conclusions:

• Dominant frequency (DF) and DF ratio (DFR) mapping are not reliable indicators of slow conduction zones (SZs) in the left atrium during atrial fibrillation.
• Slow conduction zones (SZs) exhibit higher spatial reproducibility and are primarily found in specific anatomical locations (anterior and posterior walls) of the left atrium.
• Further research is needed to understand the complex relationship between electrical mapping parameters and the atrial substrate in AF.