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Mean residence time in peripheral tissue.

P J McNamara¹, J C Fleishaker, T L Hayden

¹Division of Pharmaceutics and Pharmaceutical Analysis, College of Pharmacy, University of Kentucky, Lexington 40536.

Journal of Pharmacokinetics and Biopharmaceutics

|August 1, 1987

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This study reviews methods for measuring drug residence time in tissues. A new method for mean transit time is proposed as a potentially better indicator of drug retention properties.

Area of Science:

Pharmacokinetics and Drug Metabolism
Biomedical Engineering
Quantitative Pharmacology

Background:

Accurate determination of drug disposition in peripheral tissues is crucial for understanding drug efficacy and safety.
Existing methods for assessing drug residence time often rely on specific assumptions that may limit their applicability.
Evaluating drug retention properties in tissues informs drug development and personalized medicine.

Purpose of the Study:

To critically review current methodologies for determining mean residence time (MRT) of drugs in peripheral tissues.
To analyze the assumptions, advantages, and limitations associated with established MRT determination techniques.
To propose a novel method for assessing mean transit time (MTT) in peripheral tissues as a potentially more informative metric.

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Main Methods:

Literature review of published techniques for MRT determination in peripheral tissues.
Comparative analysis of the theoretical underpinnings and practical considerations of each method.
Development and theoretical validation of a new MTT measurement approach.

Main Results:

Identification of key assumptions inherent in current MRT methods, impacting their interpretation.
Discussion of the specific benefits and drawbacks of each reviewed technique.
The proposed MTT method offers a potentially more direct and useful assessment of drug retention dynamics.

Conclusions:

Current MRT methods for peripheral tissues have inherent limitations due to underlying assumptions.
The proposed mean transit time (MTT) offers a promising alternative for evaluating drug tissue retention.
Further validation is warranted to establish MTT as a standard pharmacokinetic parameter for tissue-bound drugs.