Background: Gentamicin is indicated as empiric treatment for neonatal sepsis. Plasmatic levels dosification of gentamicin is a common practice. The relationship between peak plasma concentration (Cmáx) with minimum inhibitory concentration (MIC) (Cmáx/MIC) is the parameter that best predicts treatment efficacy.
Aim: To determine pharmacokinetics of gentamicin in term newborn infants.
Methods: Term newborn infants receiving gentamicin, without critical illness in which plasmatic levels of gentamicin was performed were included. Elimination clearance (Cl) elimination half-life (t½) and volume of distribution (Vd) were calculated. In each case the value of Cmax/MIC parameter was calculated, considering a MIC value of 1 μg/mL for Escherichia coli.
Results: Thirteen newborns were included. The mean PK values were Cl: 0.26 mL/hour, Vd: 0.54 L/kg and t½: 6.8 h. Cmax/MIC was > 8 in 6 newborns.
Conclusions: Pharmacokinetic parameters of gentamicin are predictable in term newborn infants. With gentamicin doses normally used Cmax/MIC values reached 8 in 6 newborns. It is necessary to review the usefulness of plasma drug monitoring and gentamicin dosage in this group of newborns.
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