Anterior 123, anterior 345, anterolateral 567, wide anterior 1 to 5, inferior 123, inferior 567, posterior 78, high lateral L8.According to the abnormalities in different leads of ECG, different parts of the infarction can be judged.In order to memorize the corresponding relationship, the correspondence between leads and infarction parts is made into a mnemonic in clinical practice. 1. Anterior 123 indicates abnormalities in leads V1, V2, and V3 in anterior interventricular wall infarction. 2. Anterior 345 indicates abnormalities in leads V3, V4, and V5 in limited anterior wall infarction. 3. Anterolateral 567 indicates abnormalities in leads V5, V6, V7, I, and AVL in anterolateral wall infarction. 4. Wide anterior 1 to 5 represents abnormalities in leads V1 to V5 when there is a wide anterior wall infarction. 5. Inferior interventricular 123 represents inferior interventricular infarction when V1 to V3, II, III, and AVF leads are abnormal. 6. Lower lateral 567 indicates lower lateral wall infarction when V5~V7, II, III, and AVF leads are abnormal. 7. Orthoposterior 78 indicates orthoposterior wall infarction when V7 and V8 are abnormal. 8. 8. High lateral L8 indicates a high lateral wall infarction when leads I, AVL, and V8 are abnormal. For those with suspected infarction on ECG, other auxiliary tests such as cardiac enzyme profile test should be performed immediately to avoid delaying the treatment of infarction.