Paroxysmal supraventricular tachycardia (paroxysmal supraventricular tachycardia, supraventricular tachycardia) is a rapid, regular arrhythmia in which the heart beats rapidly (mostly 150-200 beats per minute) and neatly during an attack, often suddenly and abruptly, and is no different from normal when it does not occur. The disease has a certain pattern of development: it becomes more and more prone to attacks, more and more frequent, and the duration of the attacks becomes longer and longer, and later it may become ineffective to some previously effective termination methods or drugs. At present, for the treatment of paroxysmal supraventricular tachycardia, the medical community has no dispute that radiofrequency ablation therapy is definitely recommended. This is because radiofrequency ablation therapy can achieve a radical cure and the procedure has a high success rate, low risk, and a low recurrence rate. In contrast, drug therapy can terminate only a portion of supraventricular tachycardia and has too many side effects for long-term use and is of low value for preventing supraventricular tachycardia attacks. However, a subset of patients often just feel panicky without being able to clarify whether it is supraventricular tachycardia until it is clear that it is, and as a result, many patients delay treatment and risk other related conditions. Therefore, here I will give a relatively short summary of how to determine whether tachycardia is supraventricular tachycardia, taking into account my own experience and the experience of my center.