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Updated: Apr 25, 2026
Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants
Published on: March 14, 2013
Cerebral oxygenation in preterm infants
Karinna L Fyfe1, Stephanie R Yiallourou1, Flora Y Wong2
1The Ritchie Centre, Monash Institute of Medical Research and Prince Henry's Institute and Monash University, Melbourne, Australia; Department of Paediatrics, Monash University, Melbourne, Australia; and.
Insights
Prone sleeping reduces cerebral oxygenation in preterm infants, especially when compared to term infants. This may explain their higher risk of sudden infant death syndrome (SIDS).
Area of Science:
- Neonatal physiology
- Neurology
- Pediatrics
Background:
- Prone sleeping is a significant risk factor for sudden infant death syndrome (SIDS).
- Preterm infants face a higher risk of SIDS and potential impacts on cerebral oxygenation.
- Limited data exists on how sleeping position affects cerebral oxygenation in preterm infants.
Purpose of the Study:
- To investigate cerebral tissue oxygenation index (TOI) and mean arterial pressure (MAP) in preterm infants.
- To compare TOI and MAP in preterm versus term infants at different postterm ages.
- To assess the influence of sleeping position (prone vs. supine) and sleep state on these parameters.
Main Methods:
- Polysomnography was conducted on 35 preterm and 17 term infants.
- Measurements of TOI and MAP were taken at 2-4 weeks, 2-3 months, and 5-6 months postterm.
- Infants were studied in both prone and supine positions during active and quiet sleep.
Main Results:
- Preterm infants showed significantly lower TOI in the prone position compared to supine at all measured ages.
- Cerebral oxygenation was notably lower in preterm infants versus term infants at 2-4 weeks and 2-3 months postterm.
- Mean arterial pressure was also reduced in preterm infants when in the prone position at 2-3 months.
Conclusions:
- Prone sleeping compromises cerebral oxygenation in preterm infants.
- Reduced cerebral oxygenation, particularly in the prone position, may be linked to increased SIDS risk in preterm infants.
- Findings highlight the vulnerability of preterm infants' cerebral oxygenation to sleeping position.
Background And Objective:
Prone sleeping is a major risk factor for sudden infant death syndrome (SIDS) and preterm infants are at significantly increased risk. In term infants, prone sleeping is associated with reduced mean arterial pressure (MAP) and cerebral tissue oxygenation index (TOI). However, little is known about the effects of sleeping position on TOI and MAP in preterm infants. We aimed to examine TOI and MAP in preterm infants after term-equivalent age, during the period of greatest SIDS risk.
Methods:
Thirty-five preterm and 17 term infants underwent daytime polysomnography, including measurement of TOI (NIRO-200 spectrophotometer, Hamamatsu Photonics KK, Japan) and MAP (Finapress Medical Systems, Amsterdam, Netherlands) at 2 to 4 weeks, 2 to 3 months, and 5 to 6 months postterm age. Infants slept prone and supine in active and quiet sleep. The effects of sleep state and position were determined by using 2-way repeated measures analysis of variance and of preterm birth by using 2-way analysis of variance.
Results:
In preterm infants, TOI was significantly lower when prone compared with supine in both sleep states at all ages (P < .05). Notably, TOI was significantly lower in preterm compared with term infants at 2 to 4 weeks, in both positions (P < .05), and at 2 to 3 months when prone (P < .001), in both sleep states. MAP was also lower in preterm infants in the prone position at 2 to 3 months (P < .01).
Conclusions:
Cerebral oxygenation is reduced in the prone position in preterm infants and is lower compared with age-matched term infants, predominantly in the prone position when MAP is also reduced. This may contribute to their increased SIDS risk.
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