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Intralipid-induced decrease in oxygenation in neonates is related to changes in the respiratory quotient.

J S Tay-Uyboco1, J Belik

  • 1Department of Pediatrics, University of Manitoba, Winnipeg, Canada.

Developmental Pharmacology and Therapeutics
|January 1, 1990
PubMed
Summary
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Intravenous lipid infusions can cause hypoxemia in neonates by decreasing the respiratory quotient (RQ). This study found that a lower RQ reduces alveolar oxygen, impacting blood oxygen levels in infants receiving total parenteral nutrition.

Area of Science:

  • Neonatal Physiology
  • Nutritional Support
  • Respiratory Medicine

Background:

  • Intravenous lipid administration is linked to hypoxemia in neonates.
  • Previous studies proposed various mechanisms for this hypoxemia.
  • The role of respiratory quotient (RQ) changes was not previously explored.

Purpose of the Study:

  • To investigate the impact of lipid infusion on respiratory quotient (RQ) in neonates.
  • To determine if changes in RQ correlate with alterations in blood oxygen levels.
  • To explore the mechanism of hypoxemia following lipid administration.

Main Methods:

  • Studied 10 neonates on total parenteral nutrition without respiratory issues.
  • Measured arterialized capillary blood gases and transcutaneous PO2 (TcPO2) before and after lipid infusion.

Related Experiment Videos

  • Monitored expired gas concentrations to calculate RQ.

    • Main Results:

    • Lipid infusion decreased TcPO2 and RQ (0.94 to 0.86, p<0.05).
    • The decrease in TcPO2 correlated with reduced alveolar oxygen tension.
    • Neonates with lower initial RQ showed no significant TcPO2 change after lipid infusion.

    Conclusions:

    • Decreased RQ following lipid infusion contributes to reduced alveolar oxygen tension.
    • This reduction in alveolar oxygen is a likely cause of hypoxemia in neonates.
    • Findings suggest RQ monitoring may be important during neonatal lipid therapy.