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• W2064700863 abstract "Background/Aims: Intravenous anesthetics are often used for conscious sedation in endoscopic retrograde cholangiopancreatography (ERCP) and endoscopic sphincter of Oddi (SO) manometry. This study was designed to investigate the effects of propofol on sheep SO. Methods: SO rings were mounted in a tissue bath and tested for changes in isometric tension in response to propofol (10-8-10-4M) in the presence or absence of L-NAME (3 × 10-5 M), a non-specific inhibitor of nitric oxide (NO) synthase; indomethacin (10-5 M), an inhibitor of cyclooxygenase; glibenclamide (10-5 M), an inhibitor of ATP-sensitive potassium channels; tetraethylammonium (3 × 10-4 M), inhibitors of calcium-activated potassium channels; 4-aminopyridine (10-3 M), a voltage-dependent potassium channel blocker. Furthermore, we investigated the Ca2+ antagonist feature of propofol in precontracted SO rings by CaCl2. Results:Carbachol (10-9-10-5 M) induced concentration-dependent contraction responses in the SO rings. Propofol (10-8-10-4M) produced concentration-dependent relaxation on isolated SO rings precontracted by carbachol (10-6 M). Preincubation of SO rings by L-NAME (3 × 10-5 M), indomethacin (10-5 M), glibenclamide (10-5 M), and 4-amino-pyridine (10-3 M) did not produce a significant alteration on propofol-induced relaxation responses (p>0.05), while preincubation by tetraethylammonium (3 × 10-4M) significantly decreased the propofol-induced relaxation responses (p < 0.05). Propofol (10-8-10-4 M) induced concentration-dependently relaxations in precontracted isolated SO rings by CaCl2. Conclusion: The results suggest that propofol induced concentration-dependent relaxations in precontracted isolated SO rings. These relaxations are independent from NO, cyclooxygenase metabolites, and opened ATP-sensitive and voltage-dependent potassium channels. Opened Ca2+-sensitive K+ channels and inhibited L-type Ca2+ channels existing in smooth muscle by propofol can contribute to these relaxations. Propofol can be beneficial as alternative drugs for obtaining selective relaxation during SO manometry after controlled clinical studies." @default.
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• W2064700863 date "2007-07-01" @default.
• W2064700863 modified "2023-09-30" @default.
• W2064700863 title "Investigation of Relaxant Effects of Propofol on Sheep Sphincter of Oddi" @default.
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• W2064700863 doi "https://doi.org/10.1159/000104242" @default.
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