Comput Math Methods Med - Mathematical modeling of radiofrequency ablation for varicose veins.

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Resumo

We present a three-dimensional mathematical model for the study of radiofrequency ablation (RFA) with blood flow for varicose vein. The model designed to analyze temperature distribution heated by radiofrequency energy and cooled by blood flow includes a cylindrically symmetric blood vessel with a homogeneous vein wall. The simulated blood velocity conditions are U = 0, 1, 2.5, 5, 10, 20, and 40 mm/s. The lower the blood velocity, the higher the temperature in the vein wall and the greater the tissue damage. The region that is influenced by temperature in the case of the stagnant flow occupies approximately 28.5% of the whole geometry, while the region that is influenced by temperature in the case of continuously moving electrode against the flow direction is about 50%. The generated RF energy induces a temperature rise of the blood in the lumen and leads to an occlusion of the blood vessel. The result of the study demonstrated that higher blood velocity led to smaller thermal region and lower ablation efficiency. Since the peak temperature along the venous wall depends on the blood velocity and pullback velocity, the temperature distribution in the model influences ablation efficiency. The vein wall absorbs more energy in the low pullback velocity than in the high one.

Resumo Limpo

present threedimension mathemat model studi radiofrequ ablat rfa blood flow varicos vein model design analyz temperatur distribut heat radiofrequ energi cool blood flow includ cylindr symmetr blood vessel homogen vein wall simul blood veloc condit u mms lower blood veloc higher temperatur vein wall greater tissu damag region influenc temperatur case stagnant flow occupi approxim whole geometri region influenc temperatur case continu move electrod flow direct generat rf energi induc temperatur rise blood lumen lead occlus blood vessel result studi demonstr higher blood veloc led smaller thermal region lower ablat effici sinc peak temperatur along venous wall depend blood veloc pullback veloc temperatur distribut model influenc ablat effici vein wall absorb energi low pullback veloc high one

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