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Published on: September 6, 2017
Modelling interactions between blood pressure and brain activity in preterm neonates
Insights
Low blood pressure (hypotension) in preterm infants is linked to poor outcomes. This study found that the interaction between blood pressure and brain activity (EEG) is a better indicator of infant health than either measure alone.
Area of Science:
- Neonatal Medicine
- Neuroscience
- Biomedical Engineering
Background:
- Hypotension is common in preterm neonates, impacting short and long-term health.
- Understanding the relationship between blood pressure (BP) and brain function is crucial for treatment decisions.
Purpose of the Study:
- To investigate the interaction between BP and multichannel electroencephalography (EEG) in preterm infants (<32 weeks gestational age).
- To assess if this interaction measure correlates with clinical risk scores.
Main Methods:
- Utilized mutual information to model the dynamic coupling between BP and EEG signals.
- Analyzed short-term signal dynamics, independent of absolute BP or EEG power.
- Correlated BP, EEG spectral power, and their interaction with the Clinical Risk Index for Babies (CRIB II score).
Main Results:
- Higher CRIB II scores correlated with lower blood pressure (r=0.43).
- No significant correlation was found between CRIB II scores and EEG spectral power.
- The interaction measure between EEG and BP dynamics showed a significant correlation with CRIB II scores (r=0.49, p=0.012), indicating lower interaction with higher risk.
Conclusions:
- The dynamic interaction between blood pressure and brain activity in preterm infants is a sensitive indicator of clinical condition.
- This interaction measure may offer a more nuanced understanding of neonatal health than isolated BP or EEG parameters.
- Further research can explore the therapeutic implications of modulating this BP-EEG interaction.
Abstract:
Hypotension or low blood pressure (BP) is a common problem in preterm neonates and has been associated with adverse short and long-term outcomes. Deciding when and whether to treat hypotension relies on an understanding of the relations between blood pressure and brain function. This study aims to investigate the interaction between BP and multichannel EEG in preterm infants less than 32 weeks gestational age. The mutual information is chosen to model interaction. This measure is independent of absolute values of BP and electroencephalography (EEG) power and quantifies the level of coupling between the short-term dynamics in both signals. It is shown that while adverse health conditions as measured by higher clinical risk indices for babies (CRIB II) are accompanied by consistently lower blood pressure (r=0.43), no significant correlation was observed between CRIB scores and EEG spectral power. More importantly, the chosen measure of interaction between dynamics of EEG and BP was found to be more closely related to CRIB scores (r=0.49, p-value=0.012), with higher CRIB score associated with lower levels of interaction.
