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Renal function in preterm neonates

A Bueva1, J P Guignard

  • 1Service de Pédiatrie, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.

Pediatric Research
|November 1, 1994
PubMed
Summary

Neonatal plasma creatinine levels are high at birth and decrease as glomerular filtration rate (GFR) increases in early weeks. Premature infants show higher creatinine and lower GFR, with slower maturation than term infants.

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Area of Science:

  • Neonatal physiology
  • Renal function development
  • Pediatric nephrology

Background:

  • Plasma creatinine concentration is elevated at birth in neonates.
  • This elevation decreases with a concurrent rise in glomerular filtration rate (GFR) during the first postnatal weeks.
  • Understanding the velocity of these changes is crucial for assessing renal maturation in newborns.

Purpose of the Study:

  • To assess the velocity of changes in plasma creatinine concentration and creatinine clearance during the first three weeks of life.
  • To compare renal function maturation between term and preterm infants.
  • To investigate the correlation between gestational age and early postnatal renal function.

Main Methods:

  • Serial measurements of plasma creatinine concentration, creatinine clearance, and sodium fractional excretion were performed weekly in 66 infants (term and preterm).
  • Preterm infants were categorized into three birth weight groups (1001-1500g, 1501-2000g, 2001-2500g).
  • Term infants formed a fourth group; measurements began 1-4 days after birth.

Main Results:

  • On day 1.5, preterm infants had significantly higher plasma creatinine (91 ± 4 μmol/L) than term infants (66 ± 3 μmol/L).
  • Plasma creatinine differences persisted into the second week, decreasing over time and vanishing by day 22-23.
  • Creatinine clearance on day 1.5 correlated positively with gestational age, showing significantly lower values in more premature infants.

Conclusions:

  • Neonatal plasma creatinine levels and renal function maturation rates differ significantly between preterm and term infants.
  • The velocity of renal maturation, indicated by creatinine clearance, is less pronounced in the most premature infants.
  • These findings highlight the prolonged period of renal functional adaptation required in preterm neonates.

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