Are all measures of liver Kpuu a function of FH, as determined following oral dosing, or have we made a critical error in defining hepatic drug clearance?

Keywords

Kpuu, Hepatic bioavailability

Liver to blood ratio

Protein binding

AbbreviationsCBlood

steady-state concentration of total drug in blood

CBlood,u

steady-state concentration of unbound drug in blood

CH

steady-state concentration of total drug in the liver

CH,u

steady-state concentration of unbound drug in the liver

Cin

blood concentration entering the liver

Cout and CHepatic vein

blood concentration exiting the liver

CLBlood,u

unbound blood clearance

CLH,u

hepatic clearance determined based on systemic unbound concentrations

CLint

intrinsic hepatic clearance

CLLiver,u

hepatic clearance based on unbound liver concentrations

ECCS

Extended Clearance Classification System

ECM

Extended Clearance Model

ER

hepatic extraction ratio

FH

hepatic bioavailability

fuB

fraction of drug unbound in the blood

Kpss

Li & Jusko ratio at steady-state of total liver drug concentration to total drug concentration exiting the liver

Kpss,uu, Li & Jusko

ratio at steady-state of unbound liver drug concentration to unbound drug concentration exiting the liver

Kpuu

in vivo ratio at steady-state of unbound liver drug concentration to unbound systemic blood concentration

PSefflux

intrinsic basolateral efflux clearance

PSinflux

intrinsic basolateral influx clearance

© 2024 The Author(s). Published by Elsevier B.V.

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