Acute extensive anterior wall myocardial infarction refers to acute myocardial infarction in the anterior interventricular, anterior and lateral walls of the left ventricle. The size and extent of the myocardial infarction is very large, and this often indicates myocardial infarction caused by left main stem lesions, proximal lesions of the anterior descending branches or combined lesions of the anterior descending and gyral branches. In the case of acute myocardial infarction with ST-segment elevation on the ECG, abnormal Q waves or QS waves will appear in leads V1-V6 of the thoracic leads, lead I of the limb leads and AVL leads, the ST segment will be elevated arch-back upward, the T waves will be symmetrically inverted, and there will be dynamic changes in the ECG, in addition, the degree of myocardial enzyme elevation will be more obvious.