OBJECTIVES: Restenosis is the major complication of coronary angioplasty and stenting. In addition, the small vessel diameter represents a major limitation to the wide use of the technology. The aim of this study was to assess the feasibility and the vascular response of stent deployment in rat small vessels. METHODS: In 40 Wistar rats (500-550 g) a Nir stent crimped on a 1.5 mm Comet angioplasty balloon catheter was deployed at high pressure in the common carotid artery. Neointimal area, neointima/media ratio and the arterial dimension were assessed immediately and at 7, 14, 21, and 28 days after stenting. RESULTS: After stent deployment, the neointimal area and the neointima/media ratio increased progressively and peaked at 14 days (p < 0.05 vs 0 and 7 days). Alpha-actin-positive cells were found circumferentially organized on the lumen surface. At 21 and 28 days after stenting, the neointima and the neointima/media ratio were not statistically different compared with the results obtained fourteen days after stent deployment. No significant differences in the area of external elastic lamina were observed during the study period. In contrast, the internal lumen area was reduced significantly at 14, 21, and 28 days after the stent deployment. Subacute thrombosis rate after stent implantation was 26.5 %. CONCLUSIONS: The results of this study demonstrated that the balloon expandable stents can be safely placed into rat arteries and the reduction of the internal arterial lumen observed after stent deployment was only due to the neointima formation whereas remodeling did not occur.
OBJECTIVES: Restenosis is the major complication of coronary angioplasty and stenting. In addition, the small vessel diameter represents a major limitation to the wide use of the technology. The aim of this study was to assess the feasibility and the vascular response of stent deployment in rat small vessels. METHODS: In 40 Wistar rats (500-550 g) a Nir stent crimped on a 1.5 mm Comet angioplasty balloon catheter was deployed at high pressure in the common carotid artery. Neointimal area, neointima/media ratio and the arterial dimension were assessed immediately and at 7, 14, 21, and 28 days after stenting. RESULTS: After stent deployment, the neointimal area and the neointima/media ratio increased progressively and peaked at 14 days (p < 0.05 vs 0 and 7 days). Alpha-actin-positive cells were found circumferentially organized on the lumen surface. At 21 and 28 days after stenting, the neointima and the neointima/media ratio were not statistically different compared with the results obtained fourteen days after stent deployment. No significant differences in the area of external elastic lamina were observed during the study period. In contrast, the internal lumen area was reduced significantly at 14, 21, and 28 days after the stent deployment. Subacute thrombosis rate after stent implantation was 26.5 %. CONCLUSIONS: The results of this study demonstrated that the balloon expandable stents can be safely placed into rat arteries and the reduction of the internal arterial lumen observed after stent deployment was only due to the neointima formation whereas remodeling did not occur.
Authors: Shizu Oyamada; Xiaodong Ma; Tim Wu; Michael P Robich; Hao Wu; Xingwei Wang; Bryan Buchholz; Stephen McCarthy; Cesario F Bianchi; Frank W Sellke; Roger Laham Journal: J Surg Res Date: 2010-12-09 Impact factor: 2.192
Authors: Ilia Fishbein; Ivan Alferiev; Marina Bakay; Stanley J Stachelek; Peter Sobolewski; Meizan Lai; Hoon Choi; I-W Chen; Robert J Levy Journal: Circulation Date: 2008-04-14 Impact factor: 29.690
Authors: Janet Chamberlain; Mark Wheatcroft; Nadine Arnold; Henry Lupton; David C Crossman; Julian Gunn; Sheila Francis Journal: Cardiovasc Res Date: 2010-01-01 Impact factor: 10.787
Authors: Anna Franzone; Marco Ferrone; Giuseppe Carotenuto; Andreina Carbone; Laura Scudiero; Federica Serino; Fernando Scudiero; Raffaele Izzo; Raffaele Piccolo; Savio Saviano; Bruno Amato; Cinzia Perrino; Bruno Trimarco; Giovanni Esposito Journal: BMC Surg Date: 2012-11-15 Impact factor: 2.102