A sheep preparation for studying interactions between blood flow and drug disposition. I: Physiological profile

W. B. Runciman, A. H. Ilsley, L. E. Mather, R. Carapetis, M. M. Rao

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A sheep preparation hai been developed which allows repeated measurements of regional blood flow, oxygen consumption and drug disposition in awake, unrestrained animals. This allows systematic studies of both acute changes, such as haemodynamic disturbances, and of chronic changes, such as enzyme induction, to be carried out. Good agreement was shown between the values for cardiac output and regional blood flow obtained by the Fick and indicator dilution methods, and those obtained by others using microspheres. Significant day-to-day fluctuations in haemodynamic indices were shown to occur; assumptions that hepatic or renal blood flows are constant fractions of cardiac output, or that renal or hepatic flow indicator extraction ratios remain unchanged from day-to-day, will lead to significant errors. Thus, control measurements for each experiment are necessary. It is proposed that physiological models for studying drug disposition based on data from awake, unrestrained animal may provide insight into some mechanisms of changes in drug disposition that cannot be obtained using thf traditional compartmental method.

Original languageEnglish
Pages (from-to)1015-1028
Number of pages14
JournalBritish Journal of Anaesthesia
Issue number9
Publication statusPublished - 1 Jan 1984
Externally publishedYes

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine

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