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Investigating variations and early-life temporal changes in oxygen saturation indices in healthy moderate-late

Thomas L Wilkinson1, Jonathan James2, Jemima Clarke1

  • 1Faculty of Medicine, University of Southampton, Southampton, UK.

Archives of Disease in Childhood. Fetal and Neonatal Edition
|April 15, 2026
PubMed

Insights

Moderate-late preterm infants experience more frequent and severe intermittent hypoxemia (IH) events during sleep compared to term infants. This difference in oxygen saturation indices highlights potential risks for neurodevelopmental outcomes in preterm infants.

Area of Science:

  • Neonatal physiology
  • Respiratory medicine
  • Developmental pediatrics

Background:

  • Neonatal respiratory immaturity can lead to unstable breathing during sleep, causing intermittent hypoxemia (IH).
  • Frequent respiratory events in neonates are increasingly linked to adverse early neurodevelopmental outcomes.
  • Understanding oxygen saturation patterns is crucial for assessing infant health.

Purpose of the Study:

  • To investigate 5-week temporal changes in oxygen saturation indices.
  • To compare these changes between healthy moderate-late preterm (MLPT) and term infants.
  • To assess the prevalence and severity of intermittent hypoxemia in these groups.

Main Methods:

  • Nocturnal pulse oximetry was used to measure postductal saturations in MLPT and term infants.
  • Measurements were taken at 7, 14, 21, 28, and 35 days postnatal age.
  • Key metrics included mean SpO2, Oxygen Desaturation Indices (ODIs), and mean nadir SpO2.

Main Results:

  • Both groups showed increasing mean SpO2 over 5 weeks, with no significant difference between groups.
  • MLPT infants had a lower average mean nadir SpO2 compared to term infants (89.94% vs 91.55%).
  • MLPT infants exhibited significantly higher rates of oxygen desaturations (ODI3, ODI4, ODI10) per hour compared to term infants.

Conclusions:

  • Significant differences in intermittent hypoxemia prevalence and severity were observed between MLPT and term infants.
  • The findings suggest potential risks associated with IH in MLPT infants.
  • Further research is recommended to explore the neurodevelopmental impact of IH in this population.
Abstract

Keywords:
Child HealthNeonatologyPaediatricsPhysiologyRespiratory Medicine

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