Earlier this year, I saw a special patient, and I am sharing my experience. A 9-day-old newborn was born by cesarean section due to cloudy amniotic fluid, with mild asphyxia at birth and a chest X-ray showing amniotic fluid absorption pneumonia. He was hospitalized in a large hospital, and cardiac enzyme CK-MB 124 U/L was found after hospitalization. After 1 week of active cardioprotection and anti-infection treatment, pneumonia improved, but cardiac enzyme CK-MB 122 U/L and CK 200 U/L did not decrease significantly. The ultrasensitive troponin, cardiac ultrasound and electrocardiogram were normal. The hospital requested to continue cardiac care with cardioplegia for 1 week. At this time, the child’s father had a friend who knew me well, so he told me about his condition and asked for my opinion. I gave my opinion: Discharge the child from the hospital and see my clinic. I examined the child in detail and took a detailed medical history. I came to the following conclusions: 1. mild asphyxia has no effect on the child for the time being; 2. amniotic fluid aspiration pneumonia has healed; 3. although cardiac enzymes are high, there are no organic lesions in the heart and no myocarditis; 4. high cardiac enzymes are considered false positives. Treatment: I did not want to prescribe medicine, but I was afraid that the parents would not accept it, so I prescribed a box of Rui’anji oral liquid, half a stick each time, twice a day; I was told to retest the blood after half a month. The heart muscle enzyme CK-MB 80 U/L was rechecked after half a month; after another half month the heart muscle enzyme CK-MB 42 U/L was rechecked. consider the cure! Why do I consider CK-MB to be a false positive? First, there is no normal reference value for CK-MB in infants and children, because children have a rapid renewal of various cells, CK-MB is higher than adults, in fact, the simple elevation of CK-MB is not very meaningful. However, most hospitals currently diagnose myocardial damage as long as CK-MB is greater than the normal value of 33U/L (because of the high value of this health insurance score), doctors with a conscience point will only give Riangi oral, some doctors will give heart protection or fructose intravenous use. Then review. Do not want to say, because the doctor’s skills charge is too low too low, do not do the test without medication, the doctor will be reduced to beggars. Second, our side to check CK-MB is to use the semi-inhibition method test method, so sometimes measured CK-MB than CK high. Because CK = CK-MM + CK-MB + CK-BB, and the semi-inhibition method can only inhibit the M group, which inhibits all of CK-MM and half of CK-MB, while CK-BB is thinly released for brain cells, which is considered to be zero in this method. However, for children with asphyxia, CK-BB should be higher. On the test 1/2CK-MB = the measured number (A). And actually A=1/2CK-MB+CK-BB. So when there is brain cell destruction (e.g. in asphyxia, hypoxia, injury), the measured CK-MB will be high, but not related to myocardial damage. Because CK-MB = 2A, that is, 2A = CK-MB + CK-BB + CK-BB, and CK = CK-MM + CK-MB + CK-BB, so when CK-BB is greater than CK-MM, it will appear that CK-MB is greater than CK. It is because I know how to test CK-MB, and let me be a “miracle doctor “. But in the busy clinical work, most doctors have no time to study the test.