Atrial Conduction Velocity Correlates with Frequency Content of Bipolar Signal

Area of Science:

• Electrophysiology
• Cardiac Electrophysiology
• Arrhythmia Research

Background:

• Anisotropy in conduction velocity (CV) is a critical factor in atrial arrhythmias.
• Previous studies in skeletal muscle showed a link between CV and electromyogram signal frequency.
• This study investigated the relationship between local CV and bipolar signal frequency in the human atria.

Purpose of the Study:

• To test the hypothesis that the frequency content of endocardial bipolar signals is directly related to local CV in human atria.
• To explore the potential of using signal frequency to assess atrial CV.

Main Methods:

• Incremental atrial pacing was performed in 15 patients undergoing ablation.
• Conduction velocity (CV) was calculated by measuring propagation time and distance.
• Fast Fourier Transform was used to analyze signal frequency content, determining characteristic frequency (CF).

Main Results:

• A significant direct correlation was found between local CV and the characteristic frequency (CF) of bipolar signals.
• Analysis of 2,496 bipolar signals confirmed this relationship across individual patients and the group.

Conclusions:

• The frequency content of local bipolar signals is directly related to atrial CV.
• Mapping spectral compression of signals can identify local CV differences.
• This method provides a novel index for assessing arrhythmogenic substrates in the atria.