The disadvantages of cardiac radiofrequency ablation include recurrence, tissue necrosis and conduction block. 1. Recurrence: Cardiac radiofrequency ablation cannot completely and thoroughly ablate, especially for patients with atrial fibrillation, there is a certain risk of recurrence after radiofrequency deceleration. 2. Tissue necrosis: the radiofrequency ablation process will heat the local tissues, resulting in local tissue necrosis, but sometimes it is not good to master the process of surgical operation, which may lead to increased myocardial necrosis, and even myocardial perforation may occur. 3. Conduction block: some radiofrequency ablation patients need to ablate the Hirschsprung’s bundle, and the ablation process may cause damage to the Hirschsprung’s bundle, and second or third degree atrioventricular conduction block may occur after the operation. Radiofrequency ablation is mainly used for the treatment of tachyarrhythmias. It is important to have a thorough evaluation before the procedure and to operate carefully during the procedure to avoid serious complications. Seek medical attention if you feel unwell.