Drug effects on endogenous brain activity in preterm babies
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Updated: May 14, 2026
Preterm EEG: A Multimodal Neurophysiological Protocol
Published on: February 18, 2012
Kaija Malk1, Marjo Metsäranta2, Sampsa Vanhatalo3
1Department of Children's Clinical Neurophysiology, Helsinki University Central Hospital, Helsinki, Finland.
Insights
Routine neonatal intensive care drugs like phenobarbital and fentanyl alter preterm infant brain activity, impacting spontaneous activity transients (SATs) beyond visual EEG interpretation. These effects may influence long-term neurological development.
Area of Science:
- Neonatal Neurology
- Developmental Neuroscience
- Computational Neuroscience
Background:
- Early brain activity is crucial for neuronal connectivity in preterm infants.
- Spontaneous Activity Transients (SATs) are key indicators of early brain function.
- Neonatal intensive care units (NICUs) routinely use medications that may affect infant brain development.
Purpose of the Study:
- To investigate the impact of commonly used NICU drugs on SATs in preterm infants.
- To determine if drug administration affects brain activity beyond standard visual EEG interpretation.
Main Methods:
- Retrospective analysis of 17 EEG recordings from 15 preterm infants (26-33 weeks conceptual age).
- Categorization of recordings based on drug administration: phenobarbital, fentanyl, theophylline, and controls.
- Advanced time-series analysis of extracted SATs to quantify drug effects.
Main Results:
- Drug administration did not alter the visual appearance of SATs.
- Phenobarbital reduced SAT power and length, while enhancing high-frequency oscillations.
- Fentanyl reduced SAT length and increased high-frequency oscillations; theophylline affected mid- and high-frequency oscillations differently.
- Drug effects on SATs were not apparent through visual EEG inspection.
Conclusions:
- Commonly administered neonatal drugs significantly alter brain activity in preterm infants.
- These drug-induced changes in SATs suggest potential acute and developmental impacts.
- Further research is needed to understand the long-term neurological consequences and optimize preterm infant care.
Background:
Animal experiments have suggested that the quality of the early intermittent brain activity is important for shaping neuronal connectivity during developmental phase that corresponds to early prematurity. This is a pilot study aiming to assess whether spontaneous activity transients (SAT) in the early preterm babies are affected by drugs that are routinely used in neonatal intensive care.
Methods:
We collected retrospectively seventeen EEG recordings (15 babies, conceptional age 26-33weeks, no brain lesions) that were divided into groups according to drug administration at the time of EEG: phenobarbital, fentanyl, theophylline, and controls. SATs were extracted from the EEG for further analysis with several advanced time-series analysis paradigms.
Results:
The visual appearance of SATs was unaffected by drugs. Phenobarbital reduced the total power of the SAT events. Both fentanyl and phenobarbital reduced the length of SATs, and enhanced the oscillations at higher frequencies. Theophylline reduced the oscillatory activity at middle frequencies during SAT, but enhanced oscillations at higher frequencies during time-period prior to SAT.
Conclusions:
Our findings suggest, that (i) all drugs examined affect brain activity in ways that are not seen in the visual EEG interpretation, and that (ii) both acute and long term (i.e. developmental) effects of these drugs on brain may warrant more attention as a part of optimizing preterm neurological care.
