Effects of nitinol strecker stent placement on vascular response in normal and stenotic porcine iliac arteries

Jens J. Froelich, Heiko Alfke, Axel Wilke, Annette Ramaswamy, Klemens H. Barth, Martin Hoppe, H. Joachim Wagner, Klaus J. Klose

Research output: Contribution to journalArticle

Abstract

PURPOSE: This experimental study was conducted to evaluate neointimal thickness, lumen diameters, and histologic changes in normal and stenotic porcine iliac arteries following placement of self-expanding nitinol Strecker stents. MATERIALS AND METHODS: Neointimal trauma causing slight vascular stenosis was induced unilaterally within external iliac arteries of 12 swines by means of endothelial abrasion and high cholesterol diet. Nitinol Strecker stents were placed within the stenotic and the normal contralateral vascular segments. For histopathologic evaluation, the pigs were killed 12 or 24 weeks after stent placement and luminal diameters were evaluated angiographically. RESULTS: Excluding one occlusion, 15% narrowing of the lumen diameter was induced unilaterally (P = .002). Initial luminal gain after stent placement was greater for stenotic than for normal arteries. The amount of neointima thickness was not different between stenotic and normal vessels (P > .05). Comparing vascular diameters before stent placement and at follow-up, luminal loss due to neointima proliferation was 22% within normal arteries (P = .0002), while a luminal gain by 15% was found within the stenotic arteries (P = .008). Maturation of neointima and endothelial coverage were complete after 24 weeks. CONCLUSIONS: Even though nitinol Strecker stents induce excessive neointimal proliferation, stenotic arteries seem to profit from great early luminal gain resulting in 15% of vascular expansion at follow-up while slight stenosis is induced within normal iliac arteries.

Original languageEnglish (US)
Pages (from-to)329-338
Number of pages10
JournalJournal of Vascular and Interventional Radiology
Volume10
Issue number3
DOIs
StatePublished - Mar 1999

Keywords

  • Arteries, iliac
  • Arteries, stenosis or obstruction
  • Stents and prostheses

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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    Froelich, J. J., Alfke, H., Wilke, A., Ramaswamy, A., Barth, K. H., Hoppe, M., Wagner, H. J., & Klose, K. J. (1999). Effects of nitinol strecker stent placement on vascular response in normal and stenotic porcine iliac arteries. Journal of Vascular and Interventional Radiology, 10(3), 329-338. https://doi.org/10.1016/S1051-0443(99)70039-4