Percutaneous coronary intervention is an invasive procedure used in people with significant blockages in their coronary arteries. It involves using a balloon catheter to open a blocked artery with stenting to keep the vessel open and prevent re-obstruction. A major risk after the procedure is bleeding, and patients are monitored closely for any signs of bleeding. A long-term risk is the possibility of clot formation or re-blockage of the artery; patients are prescribed blood thinning medications like aspirin or clopidogrel as well as cholesterol-lowering ones like statins to reduce risks of clot formation and re-blockage. All patients with a stent placed are given a stent identification card that details important information like the type and location of a stent. Having this information readily available can be vital.