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Answer:
A stent is a tiny, lattice-shaped, metal tube that is inserted permanently into an artery. Drug-eluting stents are stents that contain drugs to potentially reduce the chance that arteries will become blocked again.
Stents are used to hold open arteries that have become too narrow due to atherosclerosis, a condition in which plaque builds up on the inner walls of arteries, the blood vessels that carry oxygen-rich blood throughout the body. As artery walls thicken, the pathway for blood narrows. This can slow or block blood flow.
Stents act as a scaffold, remaining in place permanently to help keep arteries open so blood can flow.
For more on stents, see http://www.fda.gov/hearthealth/treatments/medicaldevices/stent.html.
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