在射频消蚀术的放电过程中，阻抗为一重要参数。本文动物实验和４２例临床应用中阻抗变化的动态监测，探讨其临床意义。在动物和人体心脏不同部位测量的阻抗值范围十分接近，为７９～１６５Ω。一般情况下，放电开始后５～１０秒内阻抗值下降１０～５５。阻抗上升时，局部组织可发生炭化。４２例室上性心动过速病人中，３７例消蚀成功。消蚀成功部位的阻抗及放电开始后阻抗下降幅度与其他部位无明显差异。 Impedance is an important parameter in the discharge process of RFA. This animal experiment and 42 cases of clinical application of dynamic changes in impedance to explore its clinical significance. Measured in different parts of the heart of animals and human body impedance range is very close to 79 ~ 165Ω. Under normal circumstances, 5 ~ 10 seconds after the start of the discharge impedance decreased 10 ~ 55. As the impedance increases, charring can occur in local tissues. Of 42 patients with supraventricular tachycardia, 37 had successful eradication. The impedance of the site of successful erosion and the decrease of impedance after the start of discharge showed no significant difference from other sites.