Linked Life Data

11975828

Source:http://linkedlifedata.com/resource/pubmed/id/11975828

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pubmed-article:11975828pubmed:dateCreated2002-4-26lld:pubmed
pubmed-article:11975828pubmed:abstractTextThe aim of the study was to assess whether stents covered with a membrane of polytetrafluoroethylene spanned over the mashes of a sandwich-configured double stent (n = 15) prevent migration of smooth muscle cells through stent spaces, leading to less neointima formation compared with uncovered stainless steel stents (n = 14) in iliac arteries of male Chinchilla Bastard rabbits (n = 18). Lumen stenosis was assessed by quantitative angiography immediately before the animals were killed 5 weeks after stent deployment. Neointima formation was quantified by histomorphometric analysis. There were large regional and individual differences in neointima formation, leading locally to a significantly higher degree of stenosis in covered stents (histologically, 76.0 +/- 13.7 vs. 62.9 +/- 12.9%; angiographically, 33.5 +/- 21.1 vs. 7.8 +/- 8.8%) compared with uncovered stents, though mean neointimal and lumen area values were not significantly different. In conclusion, polytetrafluoroethylene-covered stents do not prevent neointima formation compared with uncovered stents. Although the membrane reduces local smooth muscle cell migration, the neointima hyperplasia at the proximal and distal ends of a covered stent stimulates migration along its longitudinal axis. In this stent-restenosis model, regional and individual proliferation processes and not the membrane-covering strut-to-strut distances determine lumen restenosis.lld:pubmed
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pubmed-article:11975828pubmed:authorpubmed-author:SickPeter BPBlld:pubmed
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pubmed-article:11975828pubmed:pagination18-25lld:pubmed
pubmed-article:11975828pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:11975828pubmed:articleTitleNeointima formation after stent implantation in an experimental model of restenosis: polytetrafluoroethylene-covered versus uncovered stainless steel stents.lld:pubmed
pubmed-article:11975828pubmed:affiliationHeart Center, Department for Internal Medicine/Cardiology, University of Leipzig, Germany. sickp@medizin.uni-leipzig.delld:pubmed
pubmed-article:11975828pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11975828pubmed:publicationTypeComparative Studylld:pubmed