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• W2028734739 abstract "In the chronically cannulated cow, the hepatic extraction ratio for intravenous boluses of morphine, diamorphine, fentanyl, methadone and buprenorphine increased towards a plateau value as portal vein drug concentration increased. An extraction ratio close to zero for morphine was observed at a portal vein plasma drug concentration of about 200 nanomol per litre, which is within the range for significant pharmacodynamic effects. The similar concentrations extrapolated for the other narcotics would be of less pharmacodynamic importance. The phenomenon did not depend with morphine on the history of drug delivery to the liver; measurement of hepatic blood flow showed the effect was not an artifact of unrepresentative blood sampling, and was not related to any action of the narcotics on hepatic blood flow. The existence of this novel type of concentration dependent hepatic extraction ratio in vivo can explain a number of anomalous observations on narcotic pharmacokinetics, especially for morphine. Furthermore, similar behaviour may be expected for non-opioid drugs having similar pharmacokinetic properties." @default.
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• W2028734739 date "1984-05-01" @default.
• W2028734739 modified "2023-09-27" @default.
• W2028734739 title "A novel form of dependency of hepatic extraction ratio of opioids in vivo upon the portal vein concentration of drug: Comparison of morphine, diamorphine, fentanyl, methadone and buprenorphine in the chronically cannulated cow" @default.
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• W2028734739 doi "https://doi.org/10.1016/0024-3205(84)90369-2" @default.
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