Supraventricular tachycardia, also known as paroxysmal supraventricular tachycardia, is caused by the presence of a double pathway or atrioventricular bypass, which leads to the formation of a foldback loop between the atria and ventricles, followed by tachycardia. It is often triggered by exercise, emotional stress, overexertion, smoking, or alcohol consumption. Paroxysmal supraventricular tachycardia is characterized by sudden onset and abrupt cessation. During an attack, the patient feels that his heart is beating very fast, with a heart rate of 150-250 beats per minute, lasting for seconds, minutes, or hours, or even days. If hemodynamic disturbances are present during the attack, electrical resuscitation can be considered directly. The vagus nerve can be stimulated during episodes of supraventricular tachycardia, and if it does not resolve, it can be converted to sinus rhythm with drugs such as adenosine and verapamil. Frequent episodes can be treated with radiofrequency ablation surgery.