This is generally the case, because myocardial infarction is a blockage of the blood supply vessels of the heart, causing ischemia and necrosis of the myocardium. If the myocardium does not have side branches or reverse blood supply, the survival time of the myocardium is 6-8 hours, which means that the myocardium It will be necrotic after 12 hours, so there is no point in performing surgery in the acute phase; and during this time, the blood vessels are filled with thrombus, the endothelium of the blood vessels is swollen, and the microvessels are occluded. It is useless to open the blood vessels. Instead, no-reflow, thrombosis, arrhythmia, etc. will occur. complication. If the blood vessel needs to be opened again, it will usually wait until about 7 to 10 days, when the blood clots in the blood vessel are reduced or gone, and it is safe to open it again.

Of course, if you still have chest pain and other symptoms 12 hours after the onset of symptoms, or the symptoms recur, or it is a non-ST segment elevation myocardial infarction, consider that the myocardium is not completely necrotic, and you can do a coronary angiography examination. If there is blood It can also be done to allow the distal myocardium to survive. This situation is rare and is also dangerous. We generally do not do it if the risk is too high for the patient. It really depends on the specific situation.