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Human renal function maturation: a quantitative description using weight and postmenstrual age.

Malin M Rhodin1, Brian J Anderson, A Michael Peters

  • 1Department of Pharmaceutical Biosciences, Division of Pharmacokinetics and Drug Therapy, Faculty of Pharmacy, Uppsala University, Uppsala, Sweden.

Pediatric Nephrology (Berlin, Germany)
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Summary
This summary is machine-generated.

This study models glomerular filtration rate (GFR) in children, from premature infants to adults. It establishes a consistent GFR prediction tool applicable across all ages and sizes.

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Area of Science:

  • Nephrology
  • Pediatric Nephrology
  • Pharmacokinetics

Background:

  • Glomerular filtration rate (GFR) assessment is crucial for evaluating kidney function.
  • Existing GFR estimation methods often lack accuracy in pediatric populations, especially in premature neonates.
  • Understanding GFR development from infancy to adulthood is essential for clinical management.

Purpose of the Study:

  • To develop a unified model for predicting glomerular filtration rate (GFR) across a wide age range, from very premature neonates to young adults.
  • To identify key factors influencing GFR changes during maturation.
  • To establish a clinically applicable definition of renal function independent of age and size variations.

Main Methods:

  • Pooled data from eight studies (n=923) with measured GFR using various methods (polyfructose, 51Cr-EDTA, mannitol, iohexol).
  • Employed a nonlinear mixed-effects modeling approach (NONMEM) to analyze GFR development.
  • Utilized an allometric power model to standardize GFR for body weight (70 kg) and assessed the influence of postmenstrual age (PMA) and postnatal age (PNA).

Main Results:

  • Postmenstrual age (PMA) was identified as a superior indicator of renal maturation compared to postnatal age (PNA).
  • A sigmoid hyperbolic model effectively described the nonlinear relationship between GFR maturation and PMA.
  • Predicted adult GFR (70 kg) is 121.2 mL/min, with half-maximal GFR achieved at 47.7 PMA weeks. By 1 year of age, GFR reaches 90% of adult levels.

Conclusions:

  • A consistent mathematical relationship for GFR prediction has been established, spanning from early prematurity through to adulthood.
  • This model offers a clinically valuable tool for defining renal function in pediatric and young adult populations.
  • The proposed GFR prediction method accounts for age and size, providing a standardized measure of kidney function.