Cardiac preexcitation is not a necessary procedure. Cardiac preexcitation only suggests that the electrical transmission system between the atria and ventricles has more channels than normal and that some of the myocardium is preexcited. Pre-excitation appears on the ECG as a shortened P-R interval and a pre-excitation wave in front of the QRS wave group. If tachyarrhythmia does not occur, it is called cardiac preexcitation. In combination with tachyarrhythmia, it is called preexcitation syndrome. If there is only preexcitation and no tachyarrhythmias are present, surgery is not required. If the preexcitation syndrome occurs more than twice a year, radiofrequency ablation surgery is recommended, otherwise it can cause arrhythmogenic cardiomyopathy, heart enlargement, and in severe cases, heart failure. The success rate of radiofrequency ablation for preexcitation syndrome is very high, up to 95% or more, and the cost of the procedure is not too high, about 30,000 yuan. Therefore, if the preexcitation syndrome occurs more than twice a year, radiofrequency ablation surgery is recommended for radical treatment.