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dc.contributor.authorUpton, R.en
dc.contributor.authorZheng, D.en
dc.contributor.authorGrant, C.en
dc.contributor.authorMartinez, A.en
dc.identifier.citationJournal of Pharmacy and Pharmacology, 2000; 52(2):181-189en
dc.description.abstractA recirculatory physiological model of the determinants of the myocardial concentrations of lignocaine after intravenous administration was developed in sheep and validated with the intention of analysing and predicting the outcome of altered dose regimens and various pathophysiological states on the initial myocardial concentrations of lignocaine. The structure and parameters of the model were determined by hybrid modelling of the time-courses of the pulmonary artery, arterial and coronary sinus concentrations of lignocaine after the intravenous administration of 100 mg of lignocaine over 5 min to 5 chronically instrumented sheep. The model accounted for the determinants of the myocardial concentrations via compartments for venous mixing, the lung (a single-compartment model with a first-order loss) and the heart (a single flow-limited compartment). Recirculation and the remainder of the body were represented as a single tissue pool with a clearance term. The distribution volume of the heart was 0.42+/-0.009 L, which gave a half-time of myocardium:blood equilibration of 2.37 min. The distribution volume of the lungs was 5.40+/-0.23 L, with an apparent first-order loss of 1.02 L min(-1) representing deep distribution or metabolism. The validity of the model was tested by comparing the predictions of the model with the equivalent data collected in 6 sheep when lignocaine (89 mg) was administered via a complex dose regimen with a faster initial rate of infusion (39.1 mg min(-1)), declining exponentially to basal infusion rate (7.02 mg min(-1)) over 8 min. The predictions of the model were in general agreement with these data. It is concluded that the model was sufficient to account for the effect of altered dose regimens of lignocaine on the time-course of its myocardial concentrations.en
dc.description.statementofresponsibilityRichard N. Upton, D.A. Zheng, Cliff Grant and Allison M. Martinezen
dc.publisherRoyal Pharmaceutical Soc Great Britainen
dc.subjectMyocardium; Animals; Sheep; Lidocaine; Anesthetics, Local; Infusions, Intravenous; Tissue Distribution; Coronary Circulation; Models, Theoretical; Half-Lifeen
dc.titleDevelopment and validation of a recirculatory physiological model of the myocardial concentrations of lignocaine after intravenous administration in sheepen
dc.typeJournal articleen
pubs.library.collectionAnaesthesia and Intensive Care publicationsen
dc.identifier.orcidUpton, R. [0000-0001-9996-4886]en
Appears in Collections:Anaesthesia and Intensive Care publications

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