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Pharmacokinetics of netilmicin in premature infants
Insights
This study on netilmicin pharmacokinetics in premature infants with sepsis found significant interpatient variability. Careful monitoring of netilmicin serum concentrations is crucial for safe and effective treatment in neonates.
Area of Science:
- Neonatal pharmacology
- Clinical pharmacokinetics
- Pediatric infectious diseases
Background:
- Sepsis is a serious concern in premature infants.
- Accurate dosing of antibiotics like netilmicin is vital for neonates.
- Understanding drug pharmacokinetics in premature infants is essential due to physiological immaturity.
Purpose of the Study:
- To investigate the pharmacokinetics of netilmicin in premature infants with sepsis.
- To determine key pharmacokinetic parameters such as clearance, volume of distribution, and half-life.
- To assess the impact of postnatal age on netilmicin pharmacokinetics.
Main Methods:
- Pharmacokinetic study involving 12 premature infants with sepsis.
- Intravenous administration of netilmicin at 2.5 mg/kg every 12 or 18 hours.
- Measurement of serum drug concentrations to calculate pharmacokinetic parameters.
- Analysis of data based on postnatal age.
Main Results:
- Mean peak netilmicin concentration was 8.9 µg/ml and mean trough was 2.8 µg/ml.
- Clearance was lower in younger infants (0.72 ml/min/kg) compared to older ones (1.10 ml/min/kg).
- Significant interpatient variability (three-fold) in pharmacokinetic parameters was observed.
Conclusions:
- Netilmicin pharmacokinetics vary considerably in premature infants.
- Postnatal age significantly influences netilmicin clearance.
- Therapeutic drug monitoring of netilmicin is recommended in this population to ensure efficacy and safety.
Abstract:
The pharmacokinetics of netilmicin were studied in 12 premature infants with proven or presumed sepsis during the first month of life. Eleven of 12 patients received netilmicin 2.5 mg/kg intravenously every 12 h while one 770-gram birth weight infant received 2.5 mg/kg every 18 h. Mean steady-state peak and trough concentrations were 8.9 micrograms/ml and 2.8 micrograms/ml, respectively. Of twelve patients, 11 had trough serum concentration above 2 micrograms/ml and four had trough serum concentrations above 3 micrograms/ml. Mean total body clearance of netilmicin was 0.84 ml/min/kg. The mean clearance of 0.72 ml/min/kg was substantially lower in patients with a mean postnatal age of 2.7 days than the clearance of 1.10 ml/min/kg in patients with a mean postnatal age of 23 days. The mean apparent volume of distribution was 0.63 l/kg; and the mean elimination halflife was 8.6 h. A three-fold interpatient variation in pharmacokinetic parameters was seen. These data suggest the need for careful monitoring of netilmicin serum concentration in premature infants.