Background: The aim of this study is to research the lesion outline and temperature\nfield in different ways in atrial radiofrequency ablation by using finite element method.\nMethods: This study used the method which considered the thermal dosage to\ndetermine the boundary between viable and dead tissue, and compared to the 50 Ã?°C\nisotherm results in analyzing lesion outline. Besides, we used Hyperbolic equation\nwhich considered the relaxation time to calculate the temperature field and contrasted\nit with Pennesââ?¬â?¢ bioheat transfer equation.\nResults: As the result of the comparison of the lesion outline, when the ablation time\nwas 120 s, the isotherm of the thermal dosage was larger than the 50 Ã?°C isotherm\nand with the increasing of the voltage the gap increased. When the ablation voltage\nwas 30 V, the 50 Ã?°C isotherm was larger than the thermal dosage isotherm when the\nablation time was less than 160 s. The isotherms overlapped when the time was 160 s.\nAnd when the ablation time was more than 160 s, the 50 Ã?°C isotherm was less than the\nthermal dosage isotherm. As to the temperature field, when the ablation voltage was\n30 V with the ablation time 120 s the highest temperature decided by Hyperbolic was\n0.761 Ã?°C higher. The highest temperature changed with relaxation time. In most cases,\nthe highest temperature of the Hyperbolic was higher otherwise the relaxation time\nwas 30ââ?¬â??40 s.\nConclusions: It is better to use CEM43 Ã?°C to estimate the lesion outline when the\nablative time within 160 s. For temperature distribution, the Hyperbolic reflects the\ninfluence of heat transmission speed, so the result is more close to the actual situation.
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