Premature beats can be divided into two different types: physiologic and pathologic. Physiologic premature beats are episodic premature beats, which generally do not have much impact on the ef value, but if they occur frequently, they may be pathologic premature beats, which may lead to a decrease in the ef value. If premature beats occur, the heart rate will be abnormal, which will lead to a series of problems, such as atrioventricular block, bradycardia, tachycardia, etc., which will cause chest tightness, chest pain and palpitations, etc. The ef value is the value of the heart’s heart. The ef value refers to the ejection fraction of the heart, and the decrease of this value is mainly related to the decrease of myocardial systolic-diastolic function. Normally, physiologic premature beats do not affect the ef value. However, if the number of premature beats is high, then it is possible to cause a decrease in cardiac ejection fraction. Not only that, with the development of the disease, patients may also develop myocardial infarction, coronary heart disease and heart failure and other serious problems. Therefore, patients should go to the hospital in time for examination, to clarify the severity of the condition, and actively cooperate with the doctor’s treatment, always pay attention to the heart rate monitoring, so as to avoid deterioration of the condition.