Related Experiment Video
Updated: Aug 7, 2026
Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants
Published on: March 14, 2013
Cerebral hemodynamics during arousals in preterm infants
Heinz Zotter1, Berndt Urlesberger, Reinhold Kerbl
1Division of Neonatology, Department of Pediatrics, Medical University of Graz, Auenbruggerplatz 30, 8036 Graz, Austria. heinz.zotter@klinikum-graz.at
Insights
Cerebral blood volume (CBV) in preterm infants remains stable during sleep arousals. This study found no significant changes in CBV, indicating intact cerebral vascular autoregulation in these vulnerable infants.
Area of Science:
- Neonatal Physiology
- Neuroscience
- Medical Imaging
Background:
- Arousals are known to influence physiological parameters in infants.
- The impact of arousals on cerebral blood volume (CBV) in preterm infants is not well understood.
- Understanding CBV regulation is crucial for assessing brain health in preterm neonates.
Purpose of the Study:
- To investigate potential changes in cerebral blood volume (CBV) during arousals in preterm infants.
- To determine if different types of arousals (cortical vs. subcortical) differentially affect CBV.
- To assess the relationship between arousals, sleep stage, and CBV in preterm infants.
Main Methods:
- Polygraphic recordings were used to monitor sleep and score arousals in 38 preterm infants.
- Near-infrared spectroscopy (NIRS) was employed to measure cerebral blood volume (CBV).
- Arousals were classified as cortical (CA) or subcortical (SCA) based on established guidelines.
Main Results:
- Cerebral blood volume (CBV) remained constant during both cortical and subcortical arousals.
- No significant alterations in cerebral vascular oxygenation or the oxygen delivery-consumption balance were observed.
- These findings were consistent across different sleep stages (active, quiet, intermediate sleep).
Conclusions:
- Arousals in stable preterm infants do not significantly alter cerebral blood volume (CBV).
- The cerebral vascular autoregulation appears to be robust and unaffected by transient arousal events in this population.
- The impact of arousals on cerebral hemodynamics in preterm infants is minimal, suggesting preserved brain stability.
Abstract:
The aim of the study was to evaluate potential changes of cerebral blood volume (CBV) related to arousals in preterm infants. As arousals are known to change different physiological parameters, it was postulated that this could also hold true for CBV. Polygraphic recordings were performed in 38 preterm infants (18 female, 20 male). The infants' gestational age at birth was 32.0+/-2.3 weeks, postconceptional age was 35.1+/-1.2 weeks and postnatal age at study entry was 24.3+/-2.9 days, birth weight was 1793+/-527 g and actual weight at study entry was 2011+/-324 g [mean (+/- standard deviation)]. CBV was measured using near infrared spectroscopy. Arousals were scored due to the guidelines of the "International Paediatric Work Group on Arousals" and categorized as either cortical (CA) or subcortical arousals (SCA). Altogether, 122 arousals (66 CA, 56 SCA) were scored. According to sleep stage, 77 arousals were analyzed in active sleep, 23 in quiet sleep and 22 in intermediate sleep. Mean duration of arousals was 8.8+/-0.3 s. CBV, cerebral vascular oxygenation and the balance between oxygen delivery and oxygen consumption remained constant during arousals in preterm infants. This was demonstrated for both CA and SCA and was independent of sleep stage, suggesting that the impact of arousals in stable preterm infants is too small to alter cerebral vascular autoregulation.
