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Renal function and renal failure in the newborn.

S E Shaffer1, M E Norman

  • 1Department of Pediatrics, Medical Center of Delaware, Newark.

Clinics in Perinatology
|March 1, 1989
PubMed
Summary

Neonatal renal function depends on conceptual age, with preterm infants showing immature kidney function. Acute renal failure (ARF) in newborns often stems from hypoxic insults or congenital issues.

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Area of Science:

  • Neonatology
  • Pediatric Nephrology
  • Developmental Physiology

Background:

  • Renal function in newborns is highly variable and age-dependent.
  • Evaluation of infant kidney function requires consideration of conceptual age.

Observation:

  • Very preterm infants (<34 weeks' conceptual age) exhibit reduced glomerular filtration rate (GFR) and tubular immaturity.
  • Infants between 34-37 weeks' conceptual age show rapid renal maturation, achieving glomerulotubular balance postnatally.

Findings:

  • Acute renal failure (ARF) in neonates is primarily caused by ischemic (hypoxic) insults and congenital malformations.
  • Oliguria and azotemia are key clinical signs of ARF in neonates.
  • Management principles are similar to older children, but with increased attention to insensible water loss in preterm infants.

Implications:

  • Understanding age-specific renal function is crucial for neonatal care.
  • Newborn ARF requires tailored management strategies, considering unique pathophysiological mechanisms.
  • Advanced therapies like peritoneal dialysis and continuous arteriovenous hemofiltration (CAVH) offer options for severe neonatal renal dysfunction.

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