Detection and localization of multiple epicardial electrical generators by a two-dipole ranging technique

Area of Science:

• Biomedical Engineering
• Computational Electrophysiology
• Cardiac Electrophysiology

Background:

• Accurate localization of cardiac electrical sources is vital for diagnosing and treating heart conditions.
• Existing methods for mapping epicardial generators have limitations in precision and ability to resolve multiple sources.

Purpose of the Study:

• To evaluate a numerical procedure for detecting and localizing two experimentally induced epicardial dipolar generators.
• To assess the accuracy of computed dipole locations relative to actual lesions.

Main Methods:

• Isolated, perfused rabbit hearts were used with 32 surface electrodes to record electrocardiograms.
• Two epicardial burns were created at varying distances, and signals were processed using iterative routines.
• The procedure computed the location of one or two independent dipoles that best reconstructed observed surface potentials.

Main Results:

• A single dipole accurately represented the first burn, located within 0.26 cm of the lesion centroid.
• Two dipoles successfully modeled the electrical field after the second burn, located within 0.42 cm and 0.57 cm of lesion centers.
• Seventy-one percent of computed dipoles were located within the visible perimeter of the burns.

Conclusions:

• The numerical procedure reliably detects and accurately localizes two simultaneously active dipolar sources on the epicardial surface.
• This method offers a promising tool for non-invasive mapping of complex cardiac electrical activity.
• Precise localization of electrical generators is achievable through rigorous analysis of the generated electrical field.