Under what circumstances is it necessary to put a stent in coronary heart disease? When you have coronary heart disease, most patients want to take medication to solve the problem and do not want to put stents much less bypass surgery, but medication, interventional therapy and surgical bypass surgery are the basic methods to treat coronary heart disease and play a complementary role. When patients have obvious symptoms of angina pectoris, medication will be administered first. If angina pectoris and breath-holding still exist after adequate medication, then stenting is definitely needed, otherwise it will affect patients’ quality of life and there is a risk of myocardial infarction at the same time. Patients who have acute myocardial infarction should undergo intervention as early as possible to avoid further myocardial necrosis. For patients with coronary artery disease, what is the maximum number of stents that can be placed? International guidelines and standards do not specify how many stents can be placed in a single procedure for coronary intervention, but need to be determined by the patient’s vascular obstruction or stenosis. The number of stents should be as few as possible to achieve the therapeutic goal, which is more economical for the patient. The average number of stents placed in a single procedure for patients admitted to the hospital is about 1.5, and not too many stents will be placed in a single procedure. In clinical practice, we have encountered patients who had more than 10 stents placed in a single procedure, which is extremely rare. The probability of restenosis varies among different stents. The restenosis rate of metal bare stents is relatively high, about 20%-30%, which means that 20%-30% of the stents may restenose after one year of stent surgery and require re-intervention. In order to improve the efficacy of stents, drug-coated stents were later produced, and the restenosis rate was significantly reduced. One year after surgery, the stent restenosis rate is about 5% in general patients, and 10% or higher in diabetic patients. The restenosis rate determines the efficacy of the stent. For example, if a hundred people have a stent placed, 90 of them may have good results and no symptoms after one year, while 5-10 of them have recurrence, which means that 90% of them still have good results. What is the choice between stents and coronary artery bypass surgery? The choice between stenting or coronary artery bypass surgery for patients with coronary artery disease depends on the patient’s age and other conditions. For younger patients, interventional treatment (stenting) is preferred. First, coronary artery bypass surgery is more invasive, and second, the bridge vessel itself has a life span. If an arterial bypass is used, there is a 90% chance that the bridge will be open after 10 years, but if a venous bypass is used, there is a 50% chance that the bridge will be occluded after 10 years. 30- or 40-year-old patients who choose coronary artery bypass surgery, if the venous bridge is occluded after 10 years, it will be difficult and risky to bypass the bridge again. Younger patients (under 50 years old) should prefer stenting, so that if restenosis occurs a few years later, stents can be placed a second or third time to extend the patient’s life, and then surgical treatment can be considered when the condition is extremely serious. What are the effects of too many stents on the body? The stent is placed in the heart for coronary intervention, and it has no effect on other organs of the body. However, after stenting, you need to take oral antiplatelet drugs for a long time, and you must take two antiplatelet drugs for the first year after surgery. Within one year, patients need to consider stopping the antiplatelet drugs if they have a fracture or need a surgical procedure, etc. How to stop the medication reasonably and how to use other medications instead are the concomitant problems brought about by stenting for coronary artery disease.