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Determinants of energy expenditure in ventilated preterm infants

M P DeMarie1, A Hoffenberg, S L Biggerstaff

  • 1Department of Pediatrics, University of Colorado Health Sciences Center, Denver, USA.

Journal of Perinatal Medicine
|March 25, 2000
PubMed

Insights

Energy expenditure (EE) in preterm infants increases with postnatal age and nutrient intake. Nonprotein calorie intake and postnatal age best predict EE, showing a significant interaction in ventilated infants during the first three weeks of life.

Area of Science:

  • Neonatology
  • Pediatric Critical Care
  • Metabolic Research

Background:

  • Preterm infants require careful monitoring of metabolic status.
  • Understanding energy expenditure (EE) is crucial for optimizing growth and development in vulnerable neonates.

Purpose of the Study:

  • To determine oxygen consumption (VO2), carbon dioxide production (VCO2), and EE in ventilated preterm infants.
  • To identify key factors influencing EE during the first three weeks of life.

Main Methods:

  • Indirect calorimetry was used to measure VO2, VCO2, and EE.
  • Regression analysis assessed relationships between EE and demographic factors, nutrient intake, and illness severity.
  • Repeated measures analysis accounted for multiple studies per infant.

Main Results:

  • EE tended to increase over the first three weeks of life, with significant individual variability.
  • Nonprotein calorie intake and postnatal age were the strongest predictors of EE.
  • No correlation was found between EE and birthweight, current weight, gestational age, protein intake, or illness severity.
  • A significant interaction between postnatal age and energy intake (EI) on EE was observed.

Conclusions:

  • Energy expenditure in ventilated preterm infants is best predicted by postnatal age and energy intake.
  • The interaction suggests that daily increases in substrate provision influence EE in this population.

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