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Dosage schedule of gentamicin for chronic renal insufficiency in children
Insights
This study on gentamicin dosing in pediatric patients with chronic renal disease found that peak serum levels were adequate regardless of kidney function. A guide was developed to adjust gentamicin dosage intervals based on creatinine clearance, ensuring safe and effective treatment.
Area of Science:
- Pediatric Nephrology
- Pharmacokinetics
- Infectious Diseases
Background:
- Chronic renal disease in children can alter drug metabolism and excretion.
- Gram-negative bacterial infections require effective antibiotic therapy, such as gentamicin.
- Accurate gentamicin dosing is crucial to balance efficacy and minimize nephrotoxicity.
Purpose of the Study:
- To evaluate gentamicin pharmacokinetics in pediatric patients with varying degrees of chronic renal disease.
- To establish a practical method for adjusting gentamicin dosage intervals in children with impaired renal function.
- To confirm the safety and efficacy of the proposed adjusted gentamicin dosage schedule.
Main Methods:
- Intramuscular administration of gentamicin at 1 mg/kg body weight to pediatric patients.
- Measurement of peak serum gentamicin levels.
- Correlation analysis between serum gentamicin half-life and endogenous creatinine clearance.
- Development of a diagram to estimate gentamicin half-life based on creatinine clearance.
Main Results:
- Peak serum gentamicin levels (3.1-9.4 microgram/ml) were generally adequate for therapy and not directly related to renal function.
- Serum half-life of gentamicin showed an inverse correlation with endogenous creatinine clearance.
- A diagram was created to estimate gentamicin's serum half-life using creatinine clearance values.
Conclusions:
- Gentamicin dosing in pediatric patients with chronic renal disease can be safely and effectively managed with adjusted intervals.
- The proposed dosage adjustment method, utilizing a creatinine clearance-based half-life estimation, provides a practical guide for clinicians.
- This approach helps maintain therapeutic gentamicin levels while minimizing risks associated with renal impairment.
Abstract:
Gentamicin was given to paediatric patients with chronic renal disease complicated by infections by Gram-negative organisms, in which renal function varied from normal to severely insufficient. Peak serum levels after an intramuscular dose of 1 mg/kg body weight ranged from 3.1 to 9.4 microgram/ml, which appeared adequate for therapy. The peak value was not related to the renal function of the individual patients. The serum half-life of gentamicin correlated inversely with the value for endogenous creatinine clearance. A diagram for the estimation of the serum half-life of gentamicin using the creatinine clearance value is presented. As a practical guide, it is recommended that the dose of gentamicin in children with renal function impairment be 1 mg/kg given intramuscularly and that the interval between doses be almost three times as long as the serum half-life, which can be estimated by means of the diagram for individual patients. The accuracy and safety of this method were confirmed by treating children with this adjusted dosage schedule.