What is a risk associated with the use of stents?

The use of stents is commonly associated with a risk of thrombosis, or the formation of blood clots. When a stent is placed in a narrowed coronary artery, it serves to keep the artery open and improve blood flow. However, the presence of the stent can trigger a healing response in the body that may lead to the formation of a clot around the stent. This can partially or completely block the blood vessel, resulting in serious complications such as heart attacks.

The other options refer to positive effects or benefits that are not directly associated with risks from stent placement. Increased oxygen transport, reduced blood pressure, and enhanced heart function are potential advantages of using stents to relieve blockages and improve blood flow, but they do not highlight any associated risks.