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Vancomycin Pharmacokinetics Throughout Life: Results from a Pooled Population Analysis and Evaluation of Current Dosing Recommendations

Abstract : Background and Objectives Uncertainty exists regarding the optimal dosing regimen for vancomycin in different patient populations, leading to a plethora of subgroup-specific pharmacokinetic models and derived dosing regimens. We aimed to investigate whether a single model for vancomycin could be developed based on a broad dataset covering the extremes of patient characteristics. Furthermore, as a benchmark for current dosing recommendations, we evaluated and optimised the expected vancomycin exposure throughout life and for specific patient subgroups. Methods A pooled population-pharmacokinetic model was built in NONMEM based on data from 14 different studies in different patient populations. Steady-state exposure was simulated and compared across patient subgroups for two US Food and Drug Administration/European Medicines Agency-approved drug labels and optimised doses were derived. Results The final model uses postmenstrual age, weight and serum creatinine as covariates. A 35-year-old, 70-kg patient with a serum creatinine level of 0.83 mg dL −1 (73.4 µmol L −1) has a V 1 , V 2 , CL and Q 2 of 42.9 L, 41.7 L, 4.10 L h −1 and 3.22 L h −1. Clearance matures with age, reaching 50% of the maximal value (5.31 L h −1 70 kg −1) at 46.4 weeks postmen-strual age then declines with age to 50% at 61.6 years. Current dosing guidelines failed to achieve satisfactory steady-state exposure across patient subgroups. After optimisation, increased doses for the Food and Drug Administration label achieve consistent target attainment with minimal (± 20%) risk of under-and over-dosing across patient subgroups. Conclusions A population model was developed that is useful for further development of age and kidney function-stratified dosing regimens of vancomycin and for individualisation of treatment through therapeutic drug monitoring and Bayesian forecasting. Key Points Current dosing recommendations fail to achieve consistent vancomycin exposure throughout life and across patient subgroups. This pharmacokinetic model for vancomycin adequately characterises vancomycin pharmacokinetics across a broad range of patient populations, including those at the extremes of age and weight.
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Pieter J Colin, Karel Allegaert, Alison Thomson, Daan Touw, Michael Dolton, et al.. Vancomycin Pharmacokinetics Throughout Life: Results from a Pooled Population Analysis and Evaluation of Current Dosing Recommendations. Clinical Pharmacokinetics, Springer Verlag, 2019, 58 (6), pp.767 - 780. ⟨10.1007/s40262-018-0727-5⟩. ⟨hal-02591728⟩

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