Document Detail


Supplemental oxygen reduces intimal hyperplasia after intraarterial stenting in the rabbit.
MedLine Citation:
PMID:  12021715     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
HYPOTHESIS: Supplemental oxygen can reduce intimal hyperplasia (IH) after stent deployment in a rabbit model.
BACKGROUND: Endovascular stent placement is technically feasible, but long-term durability in vessels outside the aortoiliac system is compromised with postinterventional IH, which causes restenosis and failure of the arterial conduit.
METHODS: Groups (n = 4 to 6) of female New Zealand white rabbits underwent placement of a 3-mm intraaortic stent with laparotomy and were placed in either normoxic (21% inspired oxygen concentration) or supplemental-oxygen (40% inspired oxygen concentration) environments for 0, 7, 14, and 28 days. The transarterial wall oxygen gradient was measured at 0, 7, and 28 days with an oxygen microelectrode. 5-Bromo-2'deoxyuridine (BrdU) was injected into the peritoneum before death to assess cellular proliferation. Aortic specimens were harvested en bloc and sectioned for analysis of cellular proliferation and intimal thickness.
RESULTS: Intraaortic stent placement significantly decreased the transarterial wall oxygen gradient in the outer 70% of the vessel wall and was easily reversed at 7, 14, and 28 days with application of supplemental oxygen. Cellular proliferation was significantly decreased at 14 days (0.5% +/- 0.001% versus 2.3% +/- 0.002%; P <.001) and 28 days (0.4% +/- 0.001% versus 1.0% +/- 0.001%; P <.025) as measured with count of nuclei staining for 5-Bromo-2'deoxyuridine in the intima and media. Intimal thickness was significantly decreased at 28 days in oxygen-supplemented rabbits (intimal area/medial area = 0.50 +/- 0.07) as compared with controls (intimal area/medial area = 0.89 +/- 0.11; P <.025).
CONCLUSION: This study shows the ability of supplemental oxygen to reverse arterial wall hypoxia, decrease cellular proliferation, and control IH at the deployment site of an intraarterial stent in a rabbit model. Forty-percent supplemental oxygen suppresses IH by 44% at 28 days as compared with normoxic control values. Cellular proliferation is reduced four-fold at 14 days and two-fold at 28 days in oxygen-supplemented rabbits as compared with control media after deployment. The clinical implications of these findings are significant, especially as the role of endovascular interventions continues to expand.
Authors:
Alexander S Tretinyak; Eugene S Lee; Kristina M Uema; Alexandre C d'Audiffret; Michael P Caldwell; Steven M Santilli
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of vascular surgery     Volume:  35     ISSN:  0741-5214     ISO Abbreviation:  J. Vasc. Surg.     Publication Date:  2002 May 
Date Detail:
Created Date:  2002-05-21     Completed Date:  2002-06-13     Revised Date:  2012-10-03    
Medline Journal Info:
Nlm Unique ID:  8407742     Medline TA:  J Vasc Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  982-7     Citation Subset:  IM    
Affiliation:
Department of Surgery, Minneapolis VA Medical Center, One Veterans Drive (112K), Minneapolis, MN 55417, USA. treti007@tc.umn.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Vessel Prosthesis Implantation / adverse effects*
Disease Models, Animal
Female
Graft Occlusion, Vascular / pathology,  prevention & control*
Hyperplasia / etiology*,  pathology,  therapy*
Oxygen Inhalation Therapy*
Rabbits
Stents / adverse effects*
Time Factors
Tunica Intima / drug effects*,  pathology*
Grant Support
ID/Acronym/Agency:
5F32 HL 10076-02/HL/NHLBI NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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