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Carboplatin dosing in children: calculation by different formulae
Gudrun Würthwein1, Barbara Krefeld, Joachim Gerss
1Zentrum für Klinische Studien, Universitätsklinikum Münster, Germany.
Choosing the right formula for calculating glomerular filtration rate (GFR) is crucial for accurate pediatric carboplatin dosing. GFR calculations in children vary significantly by age, impacting dose precision.
Area of Science:
- Pediatric Oncology
- Clinical Pharmacology
- Nephrology
Background:
- Pediatric carboplatin dosing relies on renal function.
- Numerous formulas exist for body surface area (BSA), glomerular filtration rate (GFR), and carboplatin dose calculations.
Purpose of the Study:
- To compare different formulas for BSA, GFR, and carboplatin dose calculation in children.
- To assess the impact of formula choice on dose accuracy.
Main Methods:
- A simulated cohort of children with varying ages and body types was created.
- Bias and precision of different calculation formulas were evaluated.
Main Results:
- BSA formulas (DuBois-DuBois, Gehan-George, Mosteller, Boyd) showed good agreement.
- Weight-based GFR formulas (Cole, Léger) yielded comparable results, but differences emerged with age-specific formulas (Cole, Schwartz).
- Carboplatin dose formulas (Marina, Newell, Chatelut) were comparable, but creatinine measurement precision significantly influenced results.
Conclusions:
- The selection of the GFR formula is more critical for carboplatin dose accuracy than BSA or dose equations.
- Age-dependent variations in pediatric GFR calculations introduce uncertainty.
- Complex calculation sequences (Schwartz, Marina) increase error risk; precise GFR measurement and therapeutic drug monitoring are recommended for high-risk patients.
Related Concept Videos
Drug Dosing: Infants and Children
Pharmacokinetics in Pediatric Patients: Drug Excretion
Pharmacokinetics in Pediatric Patients: Overview and Drug Absorption
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