Analysis of Pharmacokinetics and Comparison Between One-point Versus Two-point Sampling for Therapeutic Drug Monitoring of Vancomycin in Children

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BACKGROUND: Vancomycin therapeutic drug monitoring (TDM) is essential for optimizing efficacy and minimizing toxicity, particularly in acute kidney injury (AKI). However, recent guidelines favor area under the curve (AUC)-guided dosing over traditional trough monitoring to improve dosing. This study aimed to compare vancomycin TDM strategies in pediatric patients, examine the agreement between 1-point and 2-point sampling methods for AUC estimation, and explore the association between vancomycin exposure and clinical outcomes. METHODS: This retrospective cohort study included pediatric patients (2 months to 18 years of age) who underwent vancomycin TDM between 2017 and 2019 (trough-based dosing) and 2020 and 2022 (AUC-based dosing). The pharmacokinetic parameters were estimated using Bayesian software. AKI was defined according to the Kidney Disease: Improving Global Outcomes criteria. Receiver operating characteristic curve analysis was performed to identify the threshold values of AUC and trough concentrations for predicting AKI. RESULTS: A total of 288 patients were included in the study: 164 were from 2017 to 2019 and 124 were from 2020 to 2022, respectively. A comparison of the 1-point and 2-point sampling methods for estimating the AUC showed no significant differences. The incidence of AKI was slightly lower in the 2020-2022 cohort (2.4%) than in the 2017-2019 cohort (6.7%), though the difference was not statistically significant. The AUC threshold for predicting AKI was similar between 1-point and 2-point sampling methods (588-621 mg h/L). CONCLUSIONS: AUC-based vancomycin dosing was associated with a reduced incidence of AKI in pediatric patients, without compromising efficacy. Further studies are warranted to refine the exposure targets for bacteremia resolution.

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