Myocardial infarction is acute necrosis of part of the myocardium due to severe and persistent acute ischemia of the corresponding myocardium as a result of a sharp reduction or interruption of coronary blood supply occurring on the basis of coronary artery lesions. China now has about 2 million patients with myocardial infarction, with 500,000 new cases each year. The mortality rate of myocardial infarction is about 30%, and death occurs mostly within the first week, especially within the first few hours of onset. The survival rate can be greatly improved if thrombolysis is performed within 60 minutes of the onset of the disease or if interventional treatment is performed within 90 minutes to open an occluded vessel. Therefore, for patients with myocardial infarction, time is life. To treat myocardial infarction, we must race against time. The typical symptom of myocardial infarction is chest pain. The pain is often located in or adjacent to the sternum, but can also occur at any level between the epigastrium and the pharynx, rather than at the apex of the heart, and is crushing, suffocating, or heavy and stuffy in nature, often described as “like something pressing down”. The pain can be mild or severe, with a long duration of 30 minutes or more, or even hours or days, and cannot be relieved by nitroglycerin, quick-acting heart pills or other drugs. Be alert to myocardial infarction! If the above symptoms occur, immediately call 120 or seek medical attention at a nearby hospital that is available.