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The series-compartment model for hepatic elimination.

M R Gray, Y K Tam

Drug Metabolism and Disposition: the Biological Fate of Chemicals

|January 1, 1987

Summary

This study introduces a flexible liver model for substrate elimination, bridging existing models by adjusting compartment numbers. This allows for accurate prediction of how blood flow impacts drug clearance, crucial for pharmacokinetics.

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Area of Science:

Pharmacokinetics and Drug Metabolism
Physiological Modeling
Hepatobiliary Science

Background:

Hepatic elimination is vital for drug clearance.
Existing models (well-stirred, parallel-tube) have limitations in representing liver complexity.
Understanding blood flow effects on elimination is critical.

Purpose of the Study:

To present a novel empirical model for hepatic substrate elimination.
To bridge the gap between existing pharmacokinetic models.
To provide a flexible framework for studying blood flow influence on elimination.

Main Methods:

Developed a compartmental liver model with an adjustable parameter for the number of compartments.
Allowed variable dependence of clearance on blood flow.
Determined the model parameter via clearance measurements at varying blood flow rates or substrate binding extents.

Main Results:

The model successfully bridges the "well-stirred" and "parallel-tube" models.
The number of compartments effectively modulates the impact of blood flow on elimination.
The model accommodates both linear and nonlinear elimination kinetics for various substrates.

Conclusions:

The presented compartmental model offers a more adaptable approach to hepatic elimination.
It provides a valuable tool for predicting substrate clearance under varying physiological conditions.
This model enhances the understanding of drug disposition and pharmacokinetics.

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