A computational model of open-irrigated electrode for endocardial RF catheter ablation

Abstract

Radiofrequency catheter ablation (RFCA) is an important curative treatment for cardiac arrhythmias. However, during RFCA thrombus formation can occur when the electrode-tissue interface temperature exceeds 80°C. Open-irrigated electrodes reduce the risk of such side-effect. No computational model of an open-irrigated electrode in endocardial RFCA accounting for both the saline irrigation flow and the blood motion in the cardiac chamber has been proposed yet. Our aim was to introduce the first computer model including both effects. The model has been validated against existing experimental results. Computational results showed that the surface lesion width and blood temperature are affected by the irrigation flow rate. Smaller surface lesion widths and blood temperatures are obtained with higher irrigation flow rate, while the lesion depth is not affected by changing the irrigation flow rate. Larger lesions are obtained when electrode is placed horizontally. Overall, the computational findings are in close agreement with previous experimental results.