Noninvasive three-dimensional electrocardiographic imaging of ventricular activation sequence

Area of Science:

• Biomedical Engineering
• Cardiology
• Medical Imaging

Background:

• Accurate imaging of myocardial activation sequences is crucial for diagnosing and treating cardiac arrhythmias.
• Current methods often focus on surface electrical activity, limiting 3-D understanding of the myocardium.
• Noninvasive techniques are needed to visualize the entire heart's electrical behavior.

Purpose of the Study:

• To develop and validate a novel 3-D electrocardiographic imaging technique (3-DEIT) for reconstructing cardiac activation sequences.
• To assess the accuracy of 3-DEIT in mapping ventricular activation compared to invasive methods.
• To evaluate the potential of 3-DEIT in guiding interventions for cardiac arrhythmias.

Main Methods:

• Utilized a 3-D electrocardiographic imaging technique (3-DEIT) employing the boundary element method (BEM) and multiobjective nonlinear optimization.
• Constructed patient-specific torso and heart models using ultrafast computerized tomography scans.
• Validated 3-DEIT by comparing its reconstructed activation sequences with simultaneous 3-D intracardiac mapping data in rabbit models during ventricular pacing.

Main Results:

• 3-DEIT successfully reconstructed 3-D ventricular activation sequences from noninvasive body surface potential measurements.
• Estimated activation sequences showed good agreement with simultaneously recorded intracardiac electrograms.
• Key metrics demonstrated high accuracy: comparable total activation times (53.3 ± 8.1 vs. 49.8 ± 5.2 ms), low localization error (5.73 ± 1.77 mm), and minimal relative error (0.32 ± 0.06).

Conclusions:

• The developed 3-DEIT can accurately reconstruct 3-D cardiac activation sequences noninvasively.
• This technique holds significant potential for improving the diagnosis and treatment of life-threatening cardiac arrhythmias.
• 3-DEIT may serve as a valuable tool to guide catheter-based ablative interventions.