A physiologically based model of hepatic ICG clearance: Interplay between sinusoidal uptake and biliary excretion

Michael Weiss*, Tom C. Krejcie, Michael J. Avram

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Although indocyanine green (ICG) has long been used for the assessment of liver function, the respective roles of sinusoidal uptake and canalicular excretion in determining hepatic ICG clearance remain unclear. Here this issue was addressed by incorporating a liver model into a minimal physiological model of ICG disposition that accounts of the early distribution phase after bolus injection. Arterial ICG concentration-time data from awake dogs under control conditions and from the same dogs while anesthetized with 3.5% isoflurane were subjected to population analysis. The results suggest that ICG elimination in dogs is uptake limited since it depends on hepatocellular uptake capacity and on biliary excretion but not on hepatic blood flow. Isoflurane caused a 63% reduction in cardiac output and a 33% decrease in the ICG biliary excretion rate constant (resulting in a 26% reduction in elimination clearance) while leaving unchanged the sinusoidal uptake rate. The terminal slope of the concentration-time curve, K, correlated significantly with elimination clearance. The model could be useful for assessing the functions of sinusoidal and canalicular ICG transporters.

Original languageEnglish (US)
Pages (from-to)359-365
Number of pages7
JournalEuropean Journal of Pharmaceutical Sciences
Volume44
Issue number3
DOIs
StatePublished - Oct 9 2011

Keywords

  • Biliary excretion
  • Dog
  • Hepatic uptake
  • ICG
  • Isoflurane
  • Pharmacokinetic model

ASJC Scopus subject areas

  • Pharmaceutical Science

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