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Body fluid compartment changes following neonatal surgery.

A G Coran1, R A Drongowski

  • 1Section of Pediatric Surgery, C.S. Mott Children's Hospital, University of Michigan Medical School, Ann Arbor 48109-0245.

Journal of Pediatric Surgery
|August 1, 1989
PubMed
Summary

Neonatal surgery leads to a significant decrease in extracellular fluid (ECF) volume, while total body water (TBW) remains relatively stable in newborns receiving total parenteral nutrition (TPN). This study tracked fluid changes in infants with major congenital anomalies post-operation.

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Area of Science:

  • Neonatology
  • Pediatric Surgery
  • Fluid and Electrolyte Balance

Background:

  • Neonate's body composition differs significantly from adults, with higher total body water (TBW) and extracellular fluid volume (ECF).
  • Understanding fluid shifts in newborns undergoing major surgery is critical for optimal management.

Purpose of the Study:

  • To investigate the dynamic changes in TBW and ECF in neonates following major surgical procedures.
  • To compare fluid volume changes in infants with gastroschisis versus other major congenital anomalies.

Main Methods:

  • Prospective study of 20 newborns with major congenital anomalies over 4 weeks post-surgery.
  • Total body water (TBW) measured using deuterium oxide; extracellular fluid volume (ECF) assayed with sodium bromide.
  • Infants received total parenteral nutrition (TPN) throughout the study period.

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Main Results:

  • Overall, TBW remained stable (85.4% to 83.0%), while ECF significantly decreased (51.2% to 36.7%) in the observed neonates.
  • Infants with gastroschisis showed a more pronounced decrease in TBW (87.3% to 78.0%) and ECF (51.6% to 32.3%) compared to other neonates.
  • No significant differences in fluid intake and output were noted between groups.

Conclusions:

  • Major neonatal surgery results in a consistent reduction in ECF volume, with minimal alterations in TBW, even with adequate weight gain during TPN.
  • Gastroschisis surgery is associated with more substantial fluid shifts in neonates compared to other congenital anomalies.
  • Maintaining adequate nutrition via TPN supports weight gain despite significant ECF volume changes post-surgery.