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A new method for studying the relationship between hepatic uptake of drugs and their pharmacodynamic effects in anaesthetized cats.
British Journal of Pharmacology 1980 April
1 A new in vivo experimental method is described whereby the liver can be temporarily excluded from the general circulation by means of a portocaval shunt operation. The influence of this manoeuvre upon the effects of pancuronium and Org 6368 was investigated using the tibialis muscle preparation of anaesthetized cats. 2 The procedure also allowed intraportal injections of the drugs to be made so that the effect of first-passage uptake by the liver could be compared with hapatic exclusion in the same animal. 3 Hepatic exclusion greatly increased the duration of action of both drugs. Whereas intraportal injection did not significantly alter the effect of pancuronium on the tibialis muscle, the effect of Org 6368 was greatly diminished when given by this route. 4 The liver appears to tolerate short periods of hepatic exclusion and it is concluded that this technique may become a useful tool for studying the handling of drugs by this organ.
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