• Sinan Gursoy, Ocal Berkan, Ihsan Bagcivan, Tijen Kaya, Kemal Yildirim, and Caner Mimaroglu.
• Department of Anesthesiology, Cumhuriyet University School of Medicine, Sivas, Turkey.
• J. Cardiothorac. Vasc. Anesth. 2007 Feb 1;21(1):41-4.

ObjectiveIntravenous anesthetics are often used for anesthesia, sedation, and analgesia in the intraoperative and postoperative periods of coronary artery bypass graft (CABG) surgery. This study was designed to investigate the direct effects of intravenous anesthetics on the human radial artery (RA).DesignIn vitro, prospective with repeated measures.SettingUniversity research laboratory.ParticipantsRA segments (n = 20) were obtained from CABG surgery patients and were divided into 3- to 4-mm vascular rings.InterventionsUsing the organ bath technique, the endothelium-independent vasodilatation function was tested in vitro by the addition of cumulative concentrations of thiopental, ketamine, etomidate, and propofol after vasocontraction by phenylephrine in the presence of N(G)-nitro-L-arginine methyl ester (L-NAME) and indomethacin.Measurements And Main ResultsThiopental (10(-8) to 10(-4) mol/L), ketamine(10(-8) to 10(-4) mol/L), propofol (10(-8) to 3 x 10(-4) mol/L), and etomidate (10(-8) to 3 x 10(-4) mol/L) caused concentration-dependent vasorelaxation in human RA rings precontracted with phenylephrine in the presence of L-NAME and indomethacin (n = 20, for each drug). The pEC(50) and maximum relaxant effect values of thiopental and ketamine were significantly higher than for etomidate and propofol (p < 0.05).ConclusionsThese findings indicate that thiopental, ketamine, etomidate, and propofol produce concentration-dependent relaxation on RA rings from humans. Thiopental and ketamine are more potent relaxant agents than etomidate and propofol. Intravenous anesthetics may be effective as alternative vasodilators for treatment of intraoperative and postoperative spasm of coronary artery grafts.

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