Genesis of the T wave as based on an equivalent surface source model

Area of Science:

• Biophysics
• Computational Biology
• Medical Imaging

Background:

• The equivalent surface source model accurately describes body surface potentials during the QRS interval.
• This model represents the cardiac electric generator using an equivalent double layer at the ventricular boundary.

Purpose of the Study:

• To detail the application of the equivalent surface source model to T wave genesis in the surface electrocardiogram (ECG).
• To investigate the relationship between repolarization timing and T wave characteristics.
• To simulate ECG changes during local ischemia.

Main Methods:

• Utilizing an equivalent double layer source model at the ventricular boundary.
• Simulating surface ECG by timing local cellular depolarization and repolarization.
• Employing a matrix formulation for the forward problem of computing body surface potentials.
• Performing inverse computation of repolarization timing.

Main Results:

• Simulated T waves closely matched measured body surface potentials.
• T wave amplitude was found to be proportional to the dispersion of repolarization times.
• The model successfully simulated ECG changes associated with local ischemia.

Conclusions:

• The equivalent surface source model provides a valid framework for understanding T wave genesis.
• Repolarization timing dispersion is a key determinant of T wave amplitude.
• The model is valuable for studying the effects of repolarization perturbations and simulating ischemic ECG changes.