Coronary heart disease or CHD occurs due to the accumulation of fatty deposits or atheroma on the walls of the coronary arteries. There are various causes that can lead to the development of coronary heart diseases. For instance, smoking is one of the most crucial risk factors in CHD and increases the risk of blood clotting. Apart from that, high blood pressure and high cholesterol levels also contribute to the onset of CHD. Moreover, diabetes, thrombosis, and lack of regular exercise play a major role in inducing CHD.


Stents are small but extremely important medical devices that are used in an angioplasty procedure to keep the narrowing arteries open. The stents are designed specially to last forever. That means the stents are unlikely to be replaced in the lifetime of a patient. However, there is a 2-3% risk of the artery narrowing despite the stent placement. That generally occurs within 6-9 months and involves the placement of another stent in the area.