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Optimized GFR Estimation Equations for Chinese Neonates and Children: Development of New Models and Comparison With
Hiotong Lam1,2, Yahui Zhang1, Zhe Hou2
1Department of Pediatrics, Peking University Third Hospital, Beijing, China.
Insights
New Chinese-specific equations estimate glomerular filtration rate (GFR) for neonates and children, improving drug dosing accuracy. These models account for physiological differences, enhancing precision medicine for pediatric populations.
Area of Science:
- Pediatric Nephrology
- Pharmacokinetics
- Biomarker Development
Background:
- Glomerular filtration rate (GFR) is crucial for accurate drug dosing in pediatric populations, particularly neonates and children.
- Existing GFR estimation equations have limitations, including derivation from Caucasian cohorts and failure to address distinct physiological characteristics of neonates versus children.
- Development of population-specific equations is necessary to improve GFR assessment and optimize therapeutic interventions.
Purpose of the Study:
- To develop novel, Chinese-specific equations for estimating GFR in neonates and children.
- To identify and compare key predictors of GFR across neonatal and pediatric developmental stages.
- To enhance the precision of drug dosing and renal function diagnosis in Chinese pediatric populations.
Main Methods:
- Collected measured GFR (mGFR) data from 58 hospitalized Chinese neonates (30.3-41.0 weeks gestational age) without renal impairment.
- Utilized a published database of 87 Chinese children (1-18 years) with recorded mGFR.
- Employed stepwise regression analysis in allometric form, incorporating demographic and renal function markers (serum cystatin C, blood urea nitrogen, creatinine, weight, age) to develop predictive equations.
Main Results:
- Developed a GFR prediction equation for Chinese neonates using serum cystatin C, blood urea nitrogen, and postmenstrual age.
- Established a GFR prediction equation for Chinese children incorporating cystatin C, creatinine, weight, and age.
- The newly developed Chinese-specific models demonstrated superior performance compared to 16 existing equations, showing favorable correlation (R²=0.617 for neonates, R²=0.578 for children) and accuracy (P₂₀=46.6% and 70.1%, P₅₀=93.1% and 100%).
Conclusions:
- The study successfully generated Chinese-specific GFR estimation equations for both neonates and children.
- These equations provide a validated tool for improving the diagnosis of renal function in Chinese pediatric patients.
- The findings support the implementation of precision medicine by enabling more accurate, kidney-function-based drug dosing.
Abstract:
Glomerular filtration rate (GFR) maturation is critical for drug dosing in neonates and children. Current equations face dual limitations: they are primarily derived from Caucasian populations and fail to account for the fundamental physiological differences between neonates and children. This study aimed to develop Chinese-specific GFR equations and to characterize how the key predictors of GFR differ between these two developmental stages. Creatinine clearance as measured GFR (mGFR) in 58 hospitalized neonates (gestational age range, 30.3-41.0 weeks, postnatal age range, 0 to 26 days, mGFR = 3.08 ± 1.86 mL/min) without renal impairment were enrolled. Moreover, a published database of Chinese children (N = 87, age range, 1 to 18 years, mGFR = 97.0 ± 31.9 mL/min/1.73 m2) was applied. Demographic and renal function markers were included to develop equations using the stepwise regression method in allometric form. The GFR prediction equation of serum cystatin C, blood urea nitrogen and postmenstrual age of Chinese neonates was established. In children, GFR is associated with cystatin C, creatinine, weight and age. In an internal comparison with 16 published equations, our newly developed models showed favorable performance within our cohorts, with correlation (R2 of 0.617 and 0.578) and accuracy (P20 of 46.6% and 70.1%, P50 of 93.1% and 100%), respectively. The equations would provide scientific basis for aiding diagnosis of renal function of Chinese neonates and children, and supporting better precision medicine of drugs mainly excreted by kidney.
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