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Published on: September 9, 2015
Vancomycin dosing in children: what is the question?
Theresa S Cole1, Andrew Riordan
1Department of Infectious Disease and Immunology, Alder Hey Children's NHS Foundation Trust, , Liverpool, UK.
Insights
Optimizing vancomycin dosing in children is crucial. Current recommendations for higher trough levels may not be necessary for all infections, suggesting a need for revised pediatric dosing guidelines.
Area of Science:
- Pediatric Pharmacology
- Infectious Diseases
- Antimicrobial Stewardship
Background:
- Vancomycin has been used for over 60 years, but optimal pediatric dosing remains unclear.
- Effective vancomycin treatment requires achieving a target area under the concentration curve (AUC)/minimum inhibitory concentration (MIC) ratio >400.
- Rising staphylococcal MICs have led to recommendations for higher vancomycin trough levels (15-20 mg/L) in children.
Purpose of the Study:
- To evaluate the current vancomycin dosing strategies in pediatric patients.
- To determine if higher trough levels are universally necessary for effective vancomycin treatment in children.
- To propose a standardized vancomycin dosing regimen for pediatric populations.
Main Methods:
- Review of pharmacokinetic and modeling studies in children.
- Analysis of current clinical practices and their outcomes.
- Assessment of the impact of bacterial MIC on vancomycin efficacy.
Main Results:
- Most children currently do not achieve the recommended higher vancomycin trough levels.
- Pharmacokinetic data suggest higher trough levels may not be required when the organism's MIC is ≤1 mg/L.
- Limited evidence exists for the use of loading doses or continuous vancomycin infusions in pediatric patients.
Conclusions:
- A standard starting regimen of vancomycin at 15 mg/kg every 6 hours should be considered for children.
- Determining the MIC of the infecting organism is vital for guiding appropriate vancomycin trough level targets.
- Further large-scale studies are needed to establish definitive pediatric vancomycin dosing guidelines.
Abstract:
Vancomycin has been in clinical use for over 60 years, but it is still not clear what dose should be given to children. Effective treatment with vancomycin requires a serum concentration well above the minimum inhibitory concentration (MIC) of the bacteria being treated. This is predicted by the area under the concentration curve (AUC) divided by the MIC being >400 (AUC/MIC). Recent concerns about increasing MIC in staphylococci have lead to recommendations to aim for higher trough vancomycin levels (15-20 mg/L). In current practice, most children do not achieve these trough levels. Modelling and pharmacokinetic studies in children suggest these trough levels may not be necessary if the MIC of the organisms is 1 mg/L or less. Further, large-scale studies are needed to determine the most appropriate dosing of vancomycin in children. While awaiting these, it is time to consider moving to 15 mg/kg 6 h as a standard starting regime for vancomycin. It is also vital to determine the MIC of the organism being treated, as this may give some guidance about suitable trough levels to be aimed for. There is currently little evidence to guide the use of loading doses or continuous vancomycin infusions in children.
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