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Two-balloon angioplasty. Illustration of two balloon catheters being used to widen a narrowed artery. Balloon angioplasty is used to treat blood vessels that have narrowed due to fatty deposits of atheroma (yellow). A catheter is passed along the artery while the surgeon watches its progress on an X-ray monitor. When in position, a small balloon is inflated, forcing the narrowed area to widen. In two-balloon angioplasty two catheters are passed along the artery; the first is used to block the flow of blood and the second to widen the diseased area. The condition sometimes recurs.
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