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1.射频消蚀为何采用100kHz～1.5MHz的频率?为何不用更高频或微波? 答:采用上述频率的文流电有两个原因,其一是易由导管携带及释放,不造成导管击穿;其二是形成的损伤灶相对较小,不至于引起严重的并发症。采用更高频率电流如微波的损伤较大,且需特殊设计的导管,目前尚未临床应用。但因其损伤面较大,可能是一种有前途的技术。 2.射频消蚀时射频发生器上显示的阻抗是什么意思? 答:阻抗是指导管末端与消蚀组织间的电阻,是根据导管释放的电压及电流计算出来的。阻抗的大小与导管末端电极的面积、电极与组织的接触压等均有关。当导管电极表面有消蚀后碳样物质附着时,
Why radio frequency ablation 100kHz ~ 1.5MHz frequency? Why not use more high frequency or microwave? A: The use of the frequency of the text flow for two reasons, one is easy to carry and release by the catheter, does not cause a catheter hit Wear; the second is the formation of lesion is relatively small, do not cause serious complications. The use of higher frequency current, such as microwave damage greater, and the need for special design of the catheter, is currently no clinical application. However, due to its larger damage, it may be a promising technology. 2. What is the impedance shown on the RF generator during RFI? A: The impedance is the resistance between the end of the catheter and the tissue that has been ablated. It is calculated from the voltage and current delivered by the catheter. The size of the impedance and catheter terminal electrode area, the electrode and tissue contact pressure are all related. When the catheter electrode surface erosion of carbon-like material attached,