Coronary stents are small devices used to open up blockages that occur within the arteries of the heart. Rarely, stents can develop complications and in this first episode of a new Heart Stent Series, Professor Barlis looks at how and why stents can re-narrow. This process can also see new deposits of cholesterol plaque build up inside the stent leading to renarrowing and a repeat blockage. Here our discussion is general in nature and always seek the advice of your local health care professional for information relevant to your heart health.