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Individualising Gentamicin Dosage Regimens

A Comparative Review of Selected Models, Data Fitting Methods and Monitoring Strategies

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  • Clinical Pharmacokinetic Concepts
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Summary

The various components required for individualising clinical drug dosage regimens are reviewed, including a study of 3 types of fitting procedures, 2 types of gentamicin pharmacokinetic model and the utility of D-optimal times for obtaining serum gentamicin concentrations.

The combination of the current Bayesian fitting procedure, the kslope pharmacokinetic model [in which the elimination rate constant (kel) can change from dose to dose with changing creatinine clearance] and the explicit measurement of the assay error pattern yielded predictions of future serum gentamicin concentrations which were (a) slightly better than those found using weighted nonlinear least squares; (b) somewhat better than those found with Bayesian fitting and a fixed-kel model; (c) better than those found using the traditional linear regression fitting procedure and a fixed kel model. D-Optimally timed pairs of concentrations also predicted future concentrations at least as well, and more cost effectively.

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Jelliffe, R.W., Iglesias, T., Hurst, A.K. et al. Individualising Gentamicin Dosage Regimens. Clin. Pharmacokinet. 21, 461–478 (1991). https://doi.org/10.2165/00003088-199121060-00006

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