AST is the main enzyme in liver function, and its value mainly reflects the function of the liver and whether the patient has myocardial infarction or not. First of all, for liver function test, its normal value is between 0-40U/L. If the patient’s AST is higher than 40U/L, it will be more important for the patient’s liver function test. If the patient’s AST is higher than 40 U/L, it is considered to be caused by poor liver function and liver cell necrosis. In this case, the patient needs to be further observed to see whether it is caused by alcohol consumption, long-term medication, or fatigue, emotional upset, or whether the patient has underlying liver disease, such as viral hepatitis, autoimmune hepatitis, cholestatic hepatitis, etc. The above conditions may occur. All of the above conditions may occur in patients with elevated AST. Secondly, it is most often seen in patients with acute myocardial infarction, and usually within 24 hours, there will be a rise in glutamic oxal transaminase. In this case, if there is a combination of abnormal electrocardiogram results, we should actively consider further cardiac ultrasound examination, if necessary, cardiac coronary angiography, according to the results of the examination and then consider the next step of treatment.