Meshless Simulation of Multi-site Radio Frequency Catheter Ablation through the Fragile Points Method.

Area of Science:

• Computational modeling
• Biomedical engineering
• Cardiac electrophysiology

Background:

• Existing computational models for radio frequency catheter ablation (RFCA) primarily focus on single ablation sites.
• These models neglect heat accumulation effects from multiple ablations, which is clinically relevant for treating cardiac arrhythmias originating from various sites.
• The Finite Element Method (FEM) used in current models is mesh-dependent, limiting numerical accuracy and clinical applicability.

Purpose of the Study:

• To develop a novel meshless computational model for RFCA that incorporates tissue heat accumulation from previously ablated sites.
• To overcome the mesh quality restrictions associated with the Finite Element Method.
• To enable realistic simulations of multi-site ablation procedures for cardiac arrhythmia treatment.

Main Methods:

• A meshless computational model was developed to simulate RFCA.
• The model accounts for heat accumulation by using the tissue temperature from the first ablation as the initial condition for the second ablation in a two-site protocol.
• The influence of the time interval between ablations on heat distribution was evaluated.

Main Results:

• The proposed meshless model successfully simulates multi-site RFCA, considering heat accumulation.
• Previous models that ignore inter-ablation heat accumulation may underestimate actual tissue temperature distribution.
• The study evaluated the impact of varying time intervals between sequential ablations.

Conclusions:

• The novel meshless model provides a more realistic simulation of RFCA by including heat accumulation from prior ablations.
• This approach addresses limitations of FEM-based models, offering improved accuracy and suitability for clinical settings.
• The model can aid in developing dynamic heat maps for guiding ablation procedures, considering cumulative thermal effects.