Stenosis is the medical term for the narrowing of a blood vessel. Healthcare providers perform a procedure called angioplasty to treat coronary artery disease (CAD). During an angioplasty, they may place stents to open the blocked arteries due to CAD. These treatments allow blood to flow more freely through the artery. When the treated, opened artery closes up again, this is restenosis. In-stent restenosis is a blockage or narrowing that comes back in the portion of the coronary artery previously treated with a stent….

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