In a normal person, electrical activity between the atria and the ventricles can only be conducted through the atrioventricular node, the only conduction pathway, and the electrical activity from the “command” sinus node is conducted from the atria through the atrioventricular node to the ventricles, causing the heart to beat normally. The onset of supraventricular tachycardia, on the other hand, is due to the fact that there is another conduction pathway between the atria and the ventricles that conducts electrical activity in addition to the AV node (it can be one or more, often visualized as a “wire”-like structure), which, under certain circumstances, creates a recurrent electrical activity (in medical terms, called In a given situation, the two form a loop of repeated electrical activity (in medical terminology, this is called “folding”), that is, the electrical activity keeps “circling” (or “short-circuiting”) around a specific loop, resulting in tachycardia. During an episode of tachycardia, many other factors can interfere with this circular “loop” (the return loop of electrical activity), thus ending the tachycardia. It can be considered as a “congenital” heart disease.