A morphologically realistic shell model of atrial propagation and ablation

Area of Science:

• Computational biology
• Cardiac electrophysiology
• Medical modeling

Background:

• Atrial fibrillation (AF) poses a significant health burden.
• Accurate computational models are crucial for understanding AF mechanisms.
• Existing models often lack detailed anatomical realism.

Purpose of the Study:

• To develop a 3D, anatomically realistic computational model of atrial propagation.
• To simulate cardiac excitation using the Fitzhugh-Nagumo equations.
• To investigate electrophysiological phenomena in the atria.

Main Methods:

• Utilized the male Visible Human dataset for atrial geometry.
• Incorporated eleven distinct anatomical structures, including pulmonary veins and interatrial pathways.
• Employed the Fitzhugh-Nagumo equations for cellular excitation modeling.

Main Results:

• Successfully simulated sinoatrial node autorhythmicity and atrial tissue excitation.
• Reproduced spiral re-entrant wavefronts, characteristic of arrhythmias.
• Modeled ectopic beats originating in pulmonary veins and their ablation.

Conclusions:

• The developed 3D atrial model provides a realistic platform for studying cardiac electrophysiology.
• The model can simulate key phenomena relevant to normal sinus rhythm and atrial fibrillation.
• This tool facilitates quantitative analysis of atrial excitation and arrhythmia mechanisms.