What is a potential downside of having a permanent polymer on an implanted stent?

• A. Improved drug release rates
• B. Reduced risk of infection
• C. Chronic inflammation and neo-atherosclerosis
• D. Better stability of the stent

Answer: (C)

A permanent polymer on an implanted stent can lead to chronic inflammation and neo-atherosclerosis. The presence of a permanent polymer can trigger a prolonged inflammatory response in the body, as the immune system may react to the foreign material. This chronic inflammation can contribute to the development of neo-atherosclerosis, a condition characterized by the formation of atherosclerotic lesions within the arterial wall, particularly at the site of the stent.

In contrast, improved drug release rates and better stability of the stent are generally considered advantages rather than downsides. While reduced risk of infection is also hoped for with certain designs, it does not address the long-term inflammatory effects associated with permanent polymers. Thus, the potential for chronic inflammation and neo-atherosclerosis is a significant concern in the context of stent design and patient outcomes.