Paroxysmal supraventricular tachycardia is one of the common clinical arrhythmias, which is a series of clinical manifestations caused by a sudden and rapid acceleration of the heartbeat. It is common in people without organic heart disease, more in young people than in older people. It is now confirmed that paroxysmal supraventricular tachycardia is related to some congenital structural heart abnormality, which in most cases is not detected without special examination. Clinical symptoms: The patient’s heartbeat suddenly accelerates in a calm state without any aura, the pulse is mostly in the range of 160-240 beats/min, in children up to 300 beats/min, and this heartbeat also suddenly returns to normal. The duration of seizures varies, from a few seconds to several days. Most patients can terminate on their own after the onset, and a few patients must be medicated to terminate. Other symptoms vary in severity. In mild cases, there may be only heartburn, breath-holding, dizziness and weakness, while in severe cases, chest pain, dyspnea, syncope, convulsions or shock may occur. The severity of symptoms depends on the rapidity of the heart rate during the attack, the presence of other heart diseases and the patient’s tolerance level. Diagnosis: An ECG at the onset of the attack can make the diagnosis. The electrocardiogram may be normal when there is no onset, and the diagnosis is confirmed by an induction test at the hospital and an electrocardiogram after induction. In some patients, the ECG is preexcitation syndrome or short PR sign when not onset, which helps to make the diagnosis. If the ECG is a preexcitation syndrome or short PR sign, but does not develop, no treatment is needed. Clinical classification: Paroxysmal supraventricular tachycardia includes 1. AV node folding tachycardia: tachycardia occurs when the AV node has two or more fast or slow conduction pathways causing folding. 2. Atrioventricular tachycardia is caused by the presence of bypasses in addition to the normal conduction pathways between the atria and the ventricles, thus forming a foldback. According to the different bypasses this type can also be divided into the following types: dominant bypasses and occult bypasses. The overt bypass is the pre-excitation syndrome, which is manifested on the ECG under normal conditions. It can be divided into left-sided bypass (type A preexcitation) and right-sided bypass (type B preexcitation). In occult bypass, the electrocardiogram is normally normal, but the electrocardiogram is abnormal only when the heart is tachycardic, and can be divided into left-sided and right-sided occult bypass. Treatment: 1. Simple treatment at the onset: stimulation of the pharynx with chopsticks to trigger nausea (this method is recommended for non-medical workers), which can be used to terminate the attack in some patients. 2, drug treatment and prevention: ATP, isoptin, and cardioplegia can terminate episodes of paroxysmal supraventricular tachycardia and also prevent them, but they cannot be cured, and long-term medication may have side effects. 3, catheter ablation therapy: one of the best treatment measures at present. Radiofrequency ablation is to insert the electrode catheter into the heart by puncturing the femoral vein, femoral artery, or subclavian vein under the monitoring of X-ray angiography machine, and then check to determine the location of the abnormal structure causing tachycardia, and then release high-frequency current locally in the area to produce high temperature in a small area, and through the thermal efficiency, make the water in the local tissue evaporate and dry necrosis, without pain and general anesthesia. Local tissue damage is uniform, small in scope, clear in boundary, and easy to control. Compared with drug treatment, radiofrequency ablation is not a temporary prevention or termination of tachycardia attack, but a one-time cure, no longer need to use anti-arrhythmic drugs; compared with surgery, it does not need to open the chest, no general anesthesia, no pain for patients, easy operation method; in short, it is a safe and effective, simple and easy to use treatment method. Note: This disease can not be engaged in special occupations, such as driving, diving, etc., before the eradication of the disease, in order to avoid the sudden onset of the accident situation.