Stents are permanent which means they do not need to be replaced after a certain duration. Generally, once a stent is set, it remains at the location throughout life to prevent re-narrowing of the blood vessel. However, in case the blood vessel narrows again, complications can show up within a few months of placing the stent. The doctor may replace it with another stent. There can be more than one reason for inadequate stent expansion within the blood vessels. According to a study, in-stent restenosis can cause re-narrowing in the blood vessel. In this condition, cells or collagen that form scar tissue can form around the stent causing the blood vessel to narrow again.
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