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Direct stenting limits sirolimus-eluting stent edge neointimal thickening.

Abstract：

OBJECTIVE:The use of sirolimus eluting stent (SES) has strongly limited the incidence of in-stent restenosis that still remains a problem at the stent edge. The aim of this study was to analyze the neointimal thickening after implantation of SES and to assess the influence of the stent implantation procedure on the neointimal thickening in the in-stent segment and at the edge of the stent in an ex-vivo model of stented human artery. METHODS:Both balloon expandable SES and the corresponding bare metal stent (BMS) were used in a model of human mammary artery culture. Stents were implanted either directly or after predilatation (10 atm, 60 seconds) and analysis of arterial segments were performed at 28 days poststenting. Cell proliferation and neointimal thickening were assessed by immunohistochemistry, western blotting, and histomorphometry, both in the in-stent segment and at the edge of the stent. Neointimal thickening was expressed as the ratio ([neointimal area/neointimal area + media area]). RESULTS:The in-stent neointimal thickening was dramatically inhibited in the SES group compared with the BMS group whatever the stenting technique was (predilatation: 0.22 +/- 0.05 vs 0.30 +/- 0.10; P < .04; direct stenting 0.16 +/- 0.04 vs 0.30 +/- 0.13; P <.01). This effect of SES was associated with a smallest expression of the small G protein RhoA and an increase of p27kip expression. In the BMS group, predilatation and direct stenting gave similar in-stent neointimal thickening. In contrast, in the SES group, in-stent neointimal thickening was significantly reduced when direct stenting was performed (0.16 +/- 0.04 [direct stenting] vs 0.22 +/- 0.05 [predilatation], P < .03). At the stent edge, a similar neointimal thickening was observed with both type of stent when predilatation was performed on the entire segment of the artery. Direct stenting significantly reduced the neointimal thickness at the stent edge when SES where used (0.06 +/- 0.01 [direct stenting] vs 0.19 +/- 0.06 [predilatation]; P < .001) but not in the BMS group. CONCLUSION:These results confirm the efficiency of sirolimus released form SES to inhibit RhoA expression and to increase p27kip level in the arterial wall and show the benefit of direct stenting to limit the edge effect with SES.

journal_name

J Vasc Surg

journal_title

Journal of vascular surgery

authors

Guérin P,Gouëffic Y,Heymann MF,Pillet P,Al Habash O,Crochet D,Pacaud P,Loirand G

doi

10.1016/j.jvs.2007.04.063

subject

Has Abstract

pub_date

2007-08-01 00:00:00

pages

354-9

issue

2

eissn

0741-5214

issn

1097-6809

pii

S0741-5214(07)00752-5

journal_volume

46

pub_type

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