According to the origin of premature beats, they can be classified into atrial premature beats (atrial origin), ventricular premature beats (ventricular origin), and junctional premature beats (junctional origin) after examination by electrocardiogram and other instruments. Although the different origins of premature beats can be classified, different types of premature beats give the impression of irregular and uneven heartbeats, and it is difficult to accurately determine the specific type of premature beats simply by counting the pulse and listening to the heartbeat. Generally speaking, ventricular premature beats are probably the most common arrhythmia. In addition, it can also be classified as having episodic premature beats or frequent premature beats according to the frequency of premature beats.