Theoretically, ventricular premature beats are more serious than atrial premature beats. Most atrial premature contractions are due to functional reasons, such as fatigue, staying up late, mental stress, drinking strong tea or coffee, or drinking alcohol, which may lead to atrial premature contractions. If the patient has frequent atrial premature contractions and ventricular premature contractions are episodic, frequent atrial premature contractions are more serious than episodic ventricular premature contractions. Therefore, it is important to take into account the actual situation to determine which is more serious: atrial or ventricular premature. In patients with chronic obstructive pulmonary disease or other lung diseases, atrial premature beats are more likely to occur, and some patients with acute myocardial infarction, especially anterior wall infarction, are relatively prone to ventricular premature beats. If ventricular premature beats are accompanied by R-on-T phenomenon, this condition is relatively more serious.