抄録
A population pharmacokinetic (PK) model for meropenem in Japanese pediatric patients with various infectious diseases has been developed based on 116 plasma concentrations from 50 pediatric patients. The population PK parameters developed in this analysis are useful for calculation of the percent time above minimum inhibitory concentration (%T>MIC) and for optimal dosing of meropenem in pediatric patients. After dosing 20 mg/kg t.i.d. by 0.5 h infusion (approved standard dose for pediatric patients in Japan), the target value of 50%T>MIC was achieved, indicating that 20 mg/kg t.i.d. by 0.5 h infusion is effective for susceptible bacteria. In contrast, for bacteria with higher MICs such as Pseudomonas aeruginosa (MIC≥2 μg/mL), the probability of target attainment for 50%T>MIC was 60.7% at the dose of 40 mg/kg t.i.d. by 0.5 h infusion (highest dose approved for pediatric patients in Japan). The simulations described in this article indicated that 40 mg/kg t.i.d. with longer infusion duration (e.g. 4 h) is more effective against bacteria with MIC higher than 2 μg/mL. The predicted probability of target attainment for 50%T>MIC (97.0%) was well correlated to not only microbiological efficacy rate (97.0%) but also clinical efficacy rate (95.9%) in the present phase 3 study.
