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Sleep state changes associated with cerebral blood volume changes in healthy term newborn infants
D M Münger1, H U Bucher, G Duc
1Clinic for Neonatology, University Hospital of Zurich, Switzerland.
Insights
Sleep states significantly impact cerebral hemodynamics in newborns. Cerebral hemoglobin levels change with active and quiet sleep, highlighting the importance of sleep state in infant brain studies.
Area of Science:
- Neonatal Physiology
- Cerebral Hemodynamics
Background:
- Understanding cerebral hemodynamics in newborns is crucial for assessing brain health.
- Sleep states are known to influence physiological parameters, but their specific impact on infant cerebral blood flow requires further investigation.
Purpose of the Study:
- To investigate the relationship between sleep states and cerebral hemodynamics in healthy term infants.
- To determine how changes in sleep state affect cerebral oxyhaemoglobin and deoxyhaemoglobin concentrations.
Main Methods:
- Near-infrared spectroscopy (NIRS) was used to measure cerebral oxyhaemoglobin, deoxyhaemoglobin, and total haemoglobin concentration.
- Simultaneous monitoring of transcutaneous PaO2, PaCO2, arterial O2 saturation, and heart rate was performed.
- Sleep states were clinically defined and correlated with hemodynamic data in 17 healthy term infants over 1-3 hour recordings.
Main Results:
- A significant correlation was observed between sleep state transitions and changes in total cerebral haemoglobin concentration.
- Total cerebral haemoglobin increased during quiet sleep and decreased during active sleep.
- These changes were primarily attributed to alterations in cerebral oxyhaemoglobin concentration.
Conclusions:
- Sleep states demonstrably influence cerebral haemoglobin concentration in term newborn infants.
- Cerebral haemodynamics studies in newborns must account for varying sleep states for accurate interpretation.
- Findings underscore the dynamic nature of cerebral blood flow regulation during different sleep stages in neonates.
Abstract:
In order to assess the possible effects of sleep states on cerebral haemodynamics in healthy term infants, we measured cerebral oxyhaemoglobin, deoxyhaemoglobin and total haemoglobin concentration using near infrared spectroscopy. Thirty-seven sleep state changes in seventeen infants (gestational age: 37 to 41 4/7 weeks), aged between two and eight days were continuously registrated during 1-3 h. Transcutaneous PaO2, PaCO2, arterial O2 saturation and heart rate were simultaneously recorded and sleep states were clinically defined. There was a close relationship between sleep state changes and changes in total cerebral haemoglobin concentration, which increased from active to quiet sleep and decreased from quiet to active sleep. Changes in total cerebral haemoglobin were due, in the most part, to changes in the cerebral oxyhaemoglobin concentration. In conclusion, sleep states influence the cerebral haemoglobin concentration. Studies on cerebral haemodynamics should take sleep state into account in term newborn infants.