Stenting in 84 year olds means placing a stent due to stenosis, which has no clear sequelae, but there is a risk of in-stent thrombosis, in-stent restenosis and bleeding, which have a low probability of occurring. 1. In-stent thrombosis: It mostly occurs in the acute period after stenting, as the stent will cause damage to the local blood vessels, and adequate antiplatelet therapy will be given in time, there is also a possibility of thrombosis, which can induce acute myocardial infarction in patients. 2. In-stent restenosis: after implantation of stent, local endothelial cells will be stimulated, and local tissues will be proliferated, and some elderly patients may have in-stent restenosis, which will lead to symptoms of organ or tissue ischemia again. 3. Bleeding: double oral antiplatelet therapy is needed after stenting, elderly patients are prone to bleeding complications, skin and mucous membrane bleeding is more common, some elderly patients can have gastrointestinal bleeding, and very few patients may have gastrointestinal bleeding. After stenting, it is necessary to insist on taking medication to control various risk factors and reduce the risk of thrombosis, stenosis and bleeding in the stent. The probability of occurrence of the above risks is not high, and patients do not need to be alarmed. If there are any uncomfortable symptoms, it is important to go to the hospital in time and take treatment according to the doctor’s advice.