CK-MB values higher than 6.34ng/ml are considered serious, and CK-MB is a specific indicator for the diagnosis of acute myocardial infarction. It also has some guiding significance for the diagnosis of diseases such as myocarditis and muscle atrophy. CK-MB peaks 24-36 hours after the onset of myocardial infarction. If there is also persistent chest pain, wheezing, shortness of breath and other discomforts, and the electrocardiogram suggests ST-segment elevation, timely thrombolytic therapy such as urokinase should be performed to prevent the increase of myocardial infarction area and the progressive aggravation of myocardial ischemia. Normally, we should pay attention to more rest, reduce strenuous exercise and overexertion, and actively take aspirin enteric tablets and isosorbide mononitrate capsules to control the progress of the disease.