Development and evaluation of vancomycin dosage guidelines designed to achieve new target concentrations

The Journal of Antimicrobial Chemotherapy
A H ThomsonA M Lovering

Abstract

The aims of this study were to develop a population pharmacokinetic model of vancomycin in adult patients, to use this model to develop dosage guidelines targeting vancomycin trough concentrations of 10-15 mg/L and to evaluate the performance of these new guidelines. All data analyses were performed using NONMEM. A population pharmacokinetic model was first developed from vancomycin dosage and concentration data collected during routine therapeutic drug monitoring in 398 patients, then new vancomycin dosage guidelines were devised by using the model to predict vancomycin trough concentrations in a simulated dataset. Individual estimates of CL and V1 were then obtained in an independent group of 100 patients using the population model and the POSTHOC option. These individual estimates were used to predict vancomycin trough concentrations and steady-state AUC(24)/MIC ratios using the current and new dosage guidelines. The population analysis found that the vancomycin data were best described using a bi-exponential elimination model with a typical CL of 3.0 L/h that changed by 15.4% for every 10 mL/min difference from a CL(CR) of 66 mL/min. V(ss) was 1.4 L/kg. The proposed dosage guidelines were predicted to achieve 55% of vancomy...Continue Reading

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