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Radiology, Vol 164, 705-708, Copyright © 1987 by Radiological Society of North America

ARTICLES

Normal and stenotic renal arteries: experimental balloon-expandable intraluminal stenting

JC Palmaz, DT Kopp, H Hayashi, RA Schatz, G Hunter, FO Tio, O Garcia, R Alvarado, C Rees and SC Thomas

Elastic recoil of the vessel wall is a common cause of failure of percutaneous transluminal angioplasty in renal arteries. To oppose such recoil, balloon-expandable metal stents were implanted in artificially stenotic renal arteries in pigs and normal renal arteries in dogs and pigs. The stents were then examined angiographically and histologically at regular intervals. All stents were completely covered with endothelialized neointima in 3 weeks. There was no difference in intimal thickness between the stenotic and nonstenotic renal arteries. A large stent diameter and a large open or nonmetal surface may cause less intimal hyperplasia, but nonturbulent, fast arterial flow is probably the most important factor in ensuring long-term patency of the vessel.


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