1.What is a cardiac stent? A heart stent is a medical device used to lift the stenosis of coronary arteries. The main materials are: metal (nickel-chromium alloy, titanium-chromium alloy, etc.), coated and soluble materials, etc. In a common analogy, a heart stent is actually an empty tube, which is implanted into a blood vessel to prop up the vessel and relieve the blocked blood vessel. 2.The role of cardiac stent The main role of cardiac stent is to help patients’ blood vessels become smooth and relieve myocardial ischemia. 3.Does a heart stent have a shelf life? For the stent itself, there is no such thing as service life. Most of the current cardiac stents are metal stents. The metal stent itself does not have a shelf life like other drugs, so there is no expiration date and so on. However, there are studies on “absorbable stents”, that is, the stents can be absorbed and degraded after implanted in the body for a certain period of time. 4.Will the heart stent move? No, it will not. After the stent is implanted in the heart, it can fuse into the endothelium of the blood vessel under the high pressure expansion of the balloon, and generally the endothelial cells of the blood vessel can crawl all over the stent hole in a few months. 5.Can I have an MRI after stenting? Nowadays, most of the stents can be examined by MRI more than 3 months after implantation without any influence (please consult the interventional doctors for details). 6. The heart stent only solves the place with serious stenosis, but not other places where the stenosis is not serious, and it cannot stop the progress of atherosclerosis, so it is necessary to continue to take medication regularly. 7.Do I have to put a stent when I have a coronary angiography? No. The decision of whether to put stents or not depends on the degree and location of the stenosis. 8.Is it bad to put more stents? There is no such statement. The specific amount of stents to be put in the heart depends on the location and degree of stenosis and length of the diseased vessel, and some cannot be put in stents and may require open-heart bypass surgery. Moreover, this technology has been invented for more than 40 years, the technology is very mature and widely used. As long as it is a regular tertiary hospital, the level is trustworthy.