Ejection fraction usually refers to the left ventricular ejection fraction of the heart, which represents the contractile function of the left ventricle of the heart, and the normal value is often 50%-70%. 72% of the ejection fraction after an acute myocardial infarction indicates that the ejection function of the heart has not been significantly affected, and is basically in the normal range. However, it should be noted that the ejection fraction alone cannot accurately determine the severity of acute heart attack, but also needs to be combined with the presence or absence of cardiac arrhythmia, abnormal blood pressure levels, the presence or absence of cardiac enlargement, and the coordination of ventricular wall segmental motion. Acute infarction is characterized by rapid onset, rapid progression, and extremely high mortality rate. Any suspicious symptoms should be treated immediately to avoid irreversible consequences of aggravation of the condition.