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Single dose prophylaxis with metronidazole in infants during abdominal surgery: a pharmacokinetic study
Insights
Infants under 8 weeks old showed a prolonged metronidazole half-life (18.4 h) after surgery, ensuring effective antibiotic levels. Older infants had half-lives similar to adults, indicating safe and effective plasma concentrations.
Area of Science:
- Pharmacokinetics
- Pediatric Medicine
- Infectious Diseases
Background:
- Metronidazole is a crucial antibiotic for anaerobic bacterial infections.
- Understanding metronidazole pharmacokinetics in infants is vital for optimizing treatment and preventing resistance.
- Infants, especially neonates, exhibit unique physiological differences affecting drug metabolism and elimination.
Purpose of the Study:
- To determine plasma metronidazole concentrations and half-life in infants undergoing abdominal surgery.
- To compare the pharmacokinetic profile of metronidazole in infants younger and older than 8 weeks.
- To assess if therapeutic drug levels are achieved and maintained for sufficient durations.
Main Methods:
- A single intravenous dose of 20 mg/kg metronidazole was administered to 12 infants (<1 year).
- Plasma samples were collected to measure metronidazole concentrations over time.
- Half-life (t1/2) was calculated for two infant age groups: <8 weeks and >8 weeks.
Main Results:
- All infants achieved plasma metronidazole concentrations above the minimum inhibitory concentration (MIC) for anaerobic bacteria for at least 16 hours.
- Infants less than 8 weeks old exhibited a prolonged half-life of 18.4 hours.
- Infants older than 8 weeks had a half-life of 7 hours, comparable to adult values.
Conclusions:
- Single intravenous doses of metronidazole achieve therapeutic concentrations in infants undergoing abdominal surgery.
- Age significantly impacts metronidazole elimination, with younger infants (<8 weeks) requiring careful dosing consideration due to prolonged half-life.
- The findings support the use of metronidazole in pediatric surgical patients, with age-specific pharmacokinetic considerations.
Abstract:
Plasma metronidazole was measured following a single intravenous dose of 20 mg/kg (Flagyl 5 mg/ml) in 12 infants less than 1 year of age undergoing abdominal surgery. In all patients sufficient plasma concentrations, well above the MIC values for anaerobic bacteria, were found for at least 16 h. A prolonged half-life was demonstrated in the group less than 8 weeks of age (t1/2/18.4 h). The group over 8 weeks of age demonstrated a t1/2 comparable to that seen in adults (t1/2 7 h).