Anesth Pain Med.  2020 Jan;15(1):1-7. 10.17085/apm.2020.15.1.1.

A semi-compartmental model describing the pharmacokinetic-pharmacodynamic relationship

  • 1Department of Anesthesiology and Pain Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea


Frequently, we encounter the phenomenon of hysteresis in kinetic-dynamic modeling. The hysteresis loop in the concentration-effect curve suggests a time discrepancy caused by various pharmacokinetic and pharmacodynamic factors. To collapse the hysteresis loop and to simplify the concentration-effect relationship, several kinetic-dynamic modeling approaches including the effect compartment link model, turnover model (indirect response model), and tolerance/rebound model, have been used. The semicompartmental model is one method to describe the hysteresis of the pharmacokineticpharmacodynamic relationship. Furthermore, this semi-compartmental model differs from other models (full parametric approaches) as it does not require pharmacokinetic parameters to estimate pharmacodynamic parameters and ke0. Therefore, we could employ a semi-compartmental approach in case it is difficult to apply the compartment model to pharmacokinetic data, as required for the pharmacodynamic analysis of inhalational anesthetics.


Hysteresis; Pharmacodynamics; Pharmacokinetics; Pharmacology; Semicompartmental model
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