In clinical work, the main symptoms of many patients when they visit the clinic are fast heartbeat, “sudden panic in the heart”, sudden stopping of symptoms and so on, most of which are related to cardiac arrhythmia. Arrhythmia is one of the most common heart diseases in clinical practice, and is mainly categorized into fast and slow arrhythmias, including fast arrhythmias such as supraventricular tachycardia, atrial fibrillation (AF), atrial flutter, ventricular tachycardia, and so on. Tachyarrhythmias are one of the main causes of sudden cardiac death. The annual death of sudden cardiac death in China is about 500,000 cases, 90% of which are related to tachyarrhythmia, which has high incidence, high recurrence rate, and rapid progression. This article mainly talks about the problems related to supraventricular tachycardia. 1, what is supraventricular tachycardia What are the symptoms Supraventricular tachyarrhythmia includes atrioventricular nodal tachycardia, atrioventricular tachycardia, atrial tachycardia and so on. Among them, AV nodal tachycardia and atrioventricular tachycardia are more common in clinical practice. In layman’s terms, AV nodal refractory tachycardia is a tachycardia caused by an extra pathway forming a refractory loop within the AV node; AV refractory tachycardia is a tachycardia caused by an extra pathway forming a refractory loop between the ventricles; and paracordate is a pathway connecting the atria and ventricular myocardium outside of the AV node. The classification of bypasses is based on the location along the mitral and tricuspid valves. Bypasses usually show fast, nondecreasing conduction, and bypasses with only retrograde conduction are referred to as “cryptic”, while bypasses with antegrade conduction are referred to as “dominant”. “The dominant bypass channel is characterized by a preexcitation pattern on the electrocardiogram. Clinical normal usually manifested as palpitations, panic, tachycardia, most of them present sudden stop, the duration of time varies, and can be reversed by themselves. 2, why should we cure supraventricular tachycardia Paroxysmal supraventricular tachycardia patients with a high incidence of long-term recurrent episodes can easily lead to clinical symptoms and can cause tachycardia cardiomyopathy. It has been shown that patients with a preexcitation pattern on the electrocardiogram without a history of tachycardia episodes and without a family history of dilated cardiomyopathy showed cardiac enlargement and decreased cardiac function, most of them with the bypass tract located on the right side around the tricuspid annulus, and that the cardiac function of these patients improved rapidly after blocking the anterior function of the bypass tract with antiarrhythmic drugs or radiofrequency ablation. The cause of the decline in cardiac function is considered to be related to abnormal myocardial contraction due to asynchrony of myocardial depolarization, especially in the case of dominant preexcitation of the right bypass tract, where the change in the order of cardiac contraction, and the asynchrony of contraction of the interventricular and different parts of the ventricle lead to impaired cardiac function. Patients with right-sided bypass should be closely followed up with cardiac ultrasound, and radiofrequency ablation is feasible to eliminate the right-sided bypass if necessary, regardless of whether there are tachycardia episodes or not, so as to avoid the emergence of non-tachycardia cardiomyopathy. 3.Therapy for the eradication of supraventricular tachycardia For the natural bypass, only mechanical blockage can completely eradicate it, and the role of drug therapy is limited. With the continuous development of radiofrequency ablation technology and labeling technology, the success rate of ablation has been improving, and radiofrequency ablation has become an important method of treating paroxysmal atrial tachycardia. Catheter ablation of the bypass tract and electrophysiologic examination can be accomplished simultaneously. Electrophysiologic studies confirm the presence of the bypass tract and characterize its conduction and role in arrhythmias. After the bypass tract is localized, it is ablated using a maneuverable ablation catheter. Catheter ablation for the treatment of preexcitation syndrome combined with paroxysmal supraventricular tachycardia is well established, and most early results are around 95%.