Blood vessels do not show up in the regular imaging techniques. So, in angiography, a dye is injected before starting the procedure to highlight the blood vessels in the scanned image.
The procedure followed during angioplasty is somewhat similar to an angiogram. A thin flexible tube called a catheter is inserted into the narrowed or blocked blood vessel. A balloon is then inserted through the catheter once the catheter is in place. The balloon is then inflated to widen the area.
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