Myocardial necrosis 50% survival time varies, some patients can die within a few days, and some patients can survive for a long time if they recover well. Myocardial necrosis 50% indicates that the infarct area is relatively large, if the anterior descending branch is blocked, the anterior wall will have a large area of myocardial necrosis, the patient can have serious cardiac function problems, and may even induce cardiac arrhythmia, and then there is a risk of sudden death, and some patients may develop heart failure, the condition of recurrent episodes, and the time of survival will be significantly shortened. Some patients have 50% myocardial necrosis, but if the blood vessels can be opened quickly to increase the perfusion of the heart, the heart function can be restored, and the survival time of some patients will not be affected, and they can even live for a long time. After the occurrence of myocardial infarction should be quickly to the hospital for resuscitation, open the blocked blood vessels, save more myocardium, prolong the survival time of patients.