Altered gentamicin pharmacokinetics in term neonates undergoing controlled hypothermia

Yuma A. Bijleveld, Timo R. de Haan, Hanneke J. H. van der Lee, Floris Groenendaal, Peter H. Dijk, Arno van Heijst, Rogier C. J. de Jonge, Koen P. Dijkman, Henrica L. M. van Straaten, Monique Rijken, Inge A. Zonnenberg, Filip Cools, Alexandra Zecic, Debbie H. G. M. Nuytemans, Anton H. van Kaam, Ron A. A. Mathot

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Abstract

AIM(S) Little is known about the pharmacokinetic (PK) properties of gentamicin in newborns undergoing controlled hypothermia after suffering from hypoxic-ischaemic encephalopathy due to perinatal asphyxia. This study prospectively evaluates and describes the population PK of gentamicin in these patients. METHODS Demographic, clinical and laboratory data of patients included in a multicentre prospective observational cohort study (the 'PharmaCool Study') were collected. A non-linear mixed-effects regression analysis (NONMEM (R)) was performed to describe the population PK of gentamicin. The most optimal dosing regimen was evaluated based on simulations of the final model. RESULTS A total of 47 patients receiving gentamicin were included in the analysis. The PK were best described by an allometric two compartment model with gestational age (GA) as a covariate on clearance (CL). During hypothermia the CL of a typical patient (3 kg, GA 40 weeks, 2 days post-natal age (PNA)) was 0.06 l kg(-1) h(-1) (inter-individual variability (IIV) 26.6%) and volume of distribution of the central compartment (V-c) was 0.46 l kg(-1) (IIV 40.8%). CL was constant during hypothermia and rewarming, but increased by 29% after reaching normothermia (>96 h PNA). CONCLUSIONS This study describes the PK of gentamicin in neonates undergoing controlled hypothermia. The 29% higher CL in the normothermic phase compared with the preceding phases suggests a delay in normalization of CL after rewarming has occurred. Based on simulations we recommend an empiric dose of 5 mg kg(-1) every 36 h or every 24 h for patients with GA 36-40 weeks and GA 42 weeks, respectively. WHAT IS ALREADY KNOWN ABOUT THIS SUBJECT Little is known of the pharmacokinetic (PK) properties of gentamicin in neonates receiving controlled hypothermia. Only a few retrospective studies have been performed to evaluate these properties. For example, conflicting data exist with regard to the changes in clearance (CL) of gentamicin in this population. WHAT THIS STUDY ADDS A description of the PK properties of gentamicin in this patient population based on prospectively gathered data was obtained. We found a 29% higher CL during normothermia compared with the hypothermic and rewarming periods. We suggest a new dosing regimen with which adequate peak and trough levels will be acquired
Original languageEnglish
Pages (from-to)1067-1077
JournalBritish journal of clinical pharmacology
Volume81
Issue number6
DOIs
Publication statusPublished - 2016

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