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Updated: Mar 16, 2026
Application of an Amplitude-integrated EEG Monitor Cerebral Function Monitor to Neonates
Published on: September 6, 2017
Changes in Oxygenation Levels Precede Changes in Amplitude of the EEG in Premature Infants
Alexander Caicedo1,2, Liesbeth Thewissen3,4, Anne Smits5
1Department of Electrical Engineering (ESAT), STADIUS, KU Leuven, Leuven, Belgium. alexander.caicedodorado@esat.kuleuven.be.
Insights
In premature infants, changes in brain oxygenation, measured by near-infrared spectroscopy (NIRS), appear to precede changes in electroencephalogram (EEG) activity, suggesting a predictive relationship.
Area of Science:
- Neonatal physiology
- Neuroscience
- Biomedical engineering
Background:
- Maintaining brain function requires balancing metabolic demand with nutrient and oxygen supply.
- Regulation principles of brain metabolism and demand in premature infants remain unclear.
- Previous studies suggest hemodynamic changes precede EEG activity but lack advanced statistical analysis.
Purpose of the Study:
- To investigate the relationship between cerebral oxygenation and EEG activity in premature infants.
- To quantify the direction of information transfer between brain oxygenation and EEG signals.
- To explore advanced mathematical methods for analyzing physiological data in neonates.
Main Methods:
- Utilized near-infrared spectroscopy (NIRS) to assess cerebral oxygenation.
- Employed electroencephalogram (EEG) to monitor brain activity.
- Applied information dynamics mathematical methods to analyze data from 35 sedated neonates.
Main Results:
- Quantified the direction of information transfer between NIRS and EEG signals.
- Observed that changes in cerebral oxygenation (NIRS) tend to precede changes in EEG activity.
- Confirmed findings consistent with previous descriptive studies using advanced analytical techniques.
Conclusions:
- Cerebral oxygenation changes are likely precursors to EEG activity changes in sedated premature infants.
- Information dynamics provide a robust framework for understanding brain-neonatal physiological interactions.
- Further research is warranted to elucidate the precise regulatory mechanisms.
Abstract:
Brain function is supported by an appropriate balance between the metabolic demand and the supply of nutrients and oxygen. However, the physiological principles behind the regulation of brain metabolism and demand in premature infants are unknown. Some studies found that changes in hemodynamic variables in this population precede changes in EEG activity; however, these studies only used descriptive statistics. This paper describes the relationship between changes in cerebral oxygenation, assessed by means of near-infrared spectroscopy (NIRS), and changes in EEG, using mathematical methods taken from information dynamics. In a cohort of 35 neonates subjected to sedation by propofol, we quantified the direction of information transfer between brain oxygenation and EEG. The results obtained indicate that, as reported in other studies, changes in NIRS are likely to precede changes in EEG activity.
