Thank you for sharing.When the stent is released, the diameter of stent and the diameter of blood vessel expand in a ratio of 1.1:1, that is, the diameter of stent is slightly larger than the diameter of blood vessel, and the stent is even partly embedded in the wall of blood vessel, so it will not move in the blood vessel.
There are three main reasons for the need to continue taking medicine after stent implantation: first, coronary heart disease is a disease involving the whole coronary artery, but the degree and nature of the disease vary from site to site. Stent implantation only solves the problem of severe stenosis or instability of plaque in one part. There may be instability of plaque in other parts and the aggravation of atherosclerosis. These problems need to be prevented or treated by drugs. Secondly, because the implanted scaffolds are not our own tissues, there is a risk of blood clot formation in the stent. Only when the endothelium grows into the stent and completely covers the stent, the risk of blood clot formation in the stent will be reduced. This process will take more than one year. Therefore, it will take at least one year for the two antiplatelet drugs to be used together in order to reduce blood in the stent. The risk of block formation. Thirdly, there is still a risk of restenosis in the site of stent implantation, even in the drug-coated stent. According to statistics, the chance of restenosis in stent 2 years after stent implantation is about 10%. Drug therapy is beneficial to reduce in-stent restenosis.