A rapid heartbeat that prevents you from sleeping may be a tachyarrhythmia, which may require an electrocardiogram (ECG) or other tests. The main types of tachyarrhythmias are paroxysmal atrial tachycardia, atrial fibrillation, atrial flutter, paroxysmal supraventricular tachycardia, ventricular tachycardia, ventricular flutter, and ventricular fibrillation. Among them, ventricular tachycardia, ventricular flutter and ventricular fibrillation will cause hemodynamic disorders, insufficient pumping of the heart, resulting in unstable blood pressure, ischemia and hypoxia of various tissues and organs, especially the brain, and fainting or even cardiac arrest may occur, which requires immediate electrical cardioversion treatment. For paroxysmal atrial tachycardia, atrial fibrillation and atrial flutter, although it is not very urgent, but also need to control the ventricular rate and turn sinus rhythm by means of medication, electrical cardioversion and other means. Paroxysmal supraventricular tachycardia is usually sudden and abrupt, and can be treated with medications to control the heart rate, as well as radiofrequency ablation. It is important to note that arrhythmias are often caused by organic heart disease, so it is important to undergo a thorough examination to identify the cause and treat the cause at the time of consultation.