Document Detail

Comparative effects of tolazoline and nitroprusside on human isolated radial artery.
MedLine Citation:
PMID:  16368348     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The radial artery is increasingly being used in coronary revascularization as an alternative conduit to a saphenous vein graft. Its perfect endothelial capacity provides a high patency rate comparable with the internal mammary artery (IMA). However, its spastic characteristics cause difficulties during its intraoperative preparation and may lead to early postoperative graft failure. Thus, treatment and/or prevention of radial artery spasm with an effective vasodilator agent is essential for its longevity. Endogenous vasoconstrictors, including noradrenaline, endothelin-1, and thromboxane A2, are likely to play a role in the pathogenesis of graft spasm. In the present study, we evaluated the vasorelaxant effect of tolazoline, a nonselective alpha-adrenoceptor blocker, against the contractions induced by various spasmogenic agents in an isolated human radial artery. METHODS: Tolazoline (10(-9)-10(-4) M) or sodium nitroprusside (SNP, 10(-9)-10(-4) M) were cumulatively applied on radial artery rings precontracted submaximally with noradrenaline, endothelin-1, thromboxane analogue, U46619, or potassium chloride. In addition, some rings were pretreated with tolazoline (4 x 10(-6) M) for 30 minutes and the contractile response curve to noradrenaline was assessed in its presence. RESULTS: Tolazoline effectively reversed noradrenaline-induced contractions in the radial artery, whereas it failed to produce remarkable relaxations on rings contracted with other spasmogenic agents, while SNP overcame the contractions induced by all spasmogens to a similar extent. In addition, brief pretreatment of radial artery rings with tolazoline significantly inhibited the contractions to noradrenaline. CONCLUSIONS: Tolazoline is not as broadly effective as SNP against all spasmogens investigated; however, it may be effective in counteracting alpha-adrenoceptor-mediated vasospasm in human radial arteries.
Onder Teskin; B Sönmez Uydeş-Dogan; Yavuz Enç; F Ilkay Alp; Deniz Kaleli; Süheyla Keser; Taner Iyigün; Fuat Bilgen; Sabri Dagsali; Osman Ozdemir
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The Annals of thoracic surgery     Volume:  81     ISSN:  1552-6259     ISO Abbreviation:  Ann. Thorac. Surg.     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2005-12-21     Completed Date:  2006-08-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  15030100R     Medline TA:  Ann Thorac Surg     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  125-31     Citation Subset:  AIM; IM    
Department of Cardiovascular Surgery, Siyami Ersek Thoracic and Cardiovascular Surgery Education and Research Hospital, Istanbul, Turkey.
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MeSH Terms
15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid / pharmacology
Drug Evaluation, Preclinical
Endothelin-1 / pharmacology
Nitroprusside / pharmacology*
Norepinephrine / pharmacology
Potassium Chloride / pharmacology
Radial Artery / drug effects*
Receptors, Adrenergic, alpha / drug effects,  physiology
Tolazoline / pharmacology*
Vasoconstrictor Agents / pharmacology
Vasodilation / drug effects
Vasodilator Agents / pharmacology*
Reg. No./Substance:
0/Endothelin-1; 0/Receptors, Adrenergic, alpha; 0/Vasoconstrictor Agents; 0/Vasodilator Agents; 15078-28-1/Nitroprusside; 51-41-2/Norepinephrine; 59-98-3/Tolazoline; 7447-40-7/Potassium Chloride; 76898-47-0/15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid

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

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