What are stents in the heart?

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Yes you can. CT scan uses x-ray, which has no effects on stents.

A metal tube put into a coronary artery to hold it open.

This answer depends on the patients anatomy. A short case would be in the neighborhood of 45-60mins. However I have been in case that lasted 4-5 hours. Really depends on how tortuous the patients...

It is more of a sterile procedure under local aneasthesia rather than a surgery as such.The placement of the stent is acheived by the catheter which is usually inserted either radially(from the arm)...