Document Detail


Dilatation of saphenous vein grafts by nitric oxide.
MedLine Citation:
PMID:  9290559     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: To investigate firstly whether flow-dependent vasodilation is maintained in vein grafts, and secondly whether nitric oxide donors dilate vein grafts to improve the flow through graft stenoses. DESIGN, MATERIALS AND METHODS: The vasodilatation of mature patent vein grafts, in response to reactive hyperaemia and glyceryl trinitrate (GTN), was assessed by the change in external diameter using duplex ultrasonography. The severity (ratio of proximal systolic velocity, V1, to peak systolic velocity at the stenosis, V2, of vein graft stenoses was determined by duplex ultrasonography before and after 24 h of local application of GTN patches. RESULTS: In post-occlusion hyperaemia the diameter of patent distal vein grafts (n = 7) increased to a maximum of 112 +/- 1.9% of resting diameter after 2 min, p = 0.026. The diameter increased further to 117 +/- 2.5% of the resting value 5 min after oral GTN (n = 5), p = 0.007. The velocity ratio, V2/V1, through graft stenoses (n = 6) decreased by 20 +/- 5% after application of GTN patches, principally as a result of reduction in V2, mean difference 0.8, p = 0.15. The changes in response to GTN were more evident for proximal than distal vein graft stenoses. CONCLUSION: Flow-induced vasodilatation responses, which have been attributed to the endothelial release of nitric oxide, are maintained in patent vein grafts: the grafts dilate even further in response to GTN. The application of GTN patches close to a vein graft stenoses appears to reduce the velocity ratio through vein graft stenoses. GTN patches might be used to reduce the risk of graft occlusion when there is a delay between the detection and the treatment of haemodynamically significant graft stenoses.
Authors:
J Golledge; R C Hicks; M Ellis; R M Greenhalgh; J T Powell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery     Volume:  14     ISSN:  1078-5884     ISO Abbreviation:  Eur J Vasc Endovasc Surg     Publication Date:  1997 Jul 
Date Detail:
Created Date:  1997-09-24     Completed Date:  1997-09-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9512728     Medline TA:  Eur J Vasc Endovasc Surg     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  41-7     Citation Subset:  IM    
Affiliation:
Department of Surgery, Charing Cross & Westminster Medical School, London, U.K.
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MeSH Terms
Descriptor/Qualifier:
Administration, Cutaneous
Aged
Arterial Occlusive Diseases / physiopathology*,  surgery
Blood Flow Velocity
Female
Humans
Male
Middle Aged
Nitric Oxide / pharmacology*
Nitroglycerin / administration & dosage,  pharmacology*
Saphenous Vein / drug effects*,  physiopathology,  transplantation
Vasodilation / drug effects*
Chemical
Reg. No./Substance:
10102-43-9/Nitric Oxide; 55-63-0/Nitroglycerin

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


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