Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A drug- eluting stent (DES) is a coronary stent (a scaffold) placed into narrowed, diseased coronary arteries that slowly releases a drug to block cell proliferation. This prevents fibrosis that, together with clots (thrombus), could otherwise block the stented artery, a process called restenosis. The stent is usually placed within the coronary artery by an Interventional cardiologist during an angioplasty procedure.