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Biliary excretion of barium was studied in Sprague-Dawley bileduct-cannulated rats injected intravenously with 1.8 micro-g Ba/rat as 133Ba-labelled barium chloride. Approximately 0.5% of the barium dose was excreted into bile within 2 h. The time-course profile of biliary excretion of the radiotracer closely reflected that of plasma concentrations. Biliary barium levels reached their peak in the first 15 min. period after administration and rapidly declined thereafter. The plasma-to-bile barium-concentration ratio was approx. 1 at 2 h after injection. There was no tendency of barium to concentrate in liver, and the 133Ba levels in stomach and small intestine largely exceeded hepatic levels. There is evidence indicating that barium is predominately excreted with faeces following parenteral administration in rats and humans. The results of this study suggest that biliary excretion is of little quantitative importance and that physiological routes other than bile contribute to elimination of barium by the digestive tract.

Additional information

Authors: EDEL J, JRC Ispra (IT);SABBIONI E, JRC Ispra (IT);DI NUCCI A ET AL., University of Pavia, Department of Internal Medicine (IT);MINNOIA C, Fondazione Clinica del Lavoro, Pavia (IT);CANEDOLI S, Azienda Gas Acqua Consorziale (IT)
Bibliographic Reference: Article: Biological Trace Element Research, Vol. 30 (1991) pp. 267-276
Record Number: 199210146 / Last updated on: 1994-12-02
Original language: en
Available languages: en