EEG Dynamics in Children Before, During and After General Anesthesia
Maximilian Markus1, Feidias Panagiotou1, Claudia Spies1
1Department of Anaesthesiology and Intensive Care Medicine (CCM, CVK), Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
Insights
Perioperative electroencephalogram (EEG) patterns in young children (<8 years) show distinct age-related differences. These findings highlight the need for age-adapted anesthesia monitoring to ensure patient safety.
Area of Science:
- Anesthesiology
- Neuroscience
- Pediatric Medicine
Background:
- Perioperative monitoring using electroencephalogram (EEG) is crucial in pediatric anesthesia.
- Current EEG indices are often derived from adult data and may not accurately reflect developmental changes in children.
- Understanding age-specific EEG signatures is vital for optimizing anesthetic care in young patients.
Purpose of the Study:
- To characterize perioperative frontal EEG patterns in children younger than 8 years.
- To identify age-related differences in EEG activity during anesthesia induction, maintenance, and emergence.
- To provide data for developing age-appropriate EEG monitoring tools for pediatric anesthesia.
Main Methods:
- Prospective recording of 147 frontal EEGs from children aged 1 month to 8 years under general anesthesia.
- Utilized the Narcotrend Monitor for data acquisition, with subsequent analysis of EEG frequency bands.
- Categorized patients into four age groups (0-5, 6-11, 12-23, and >24 months) for comparative analysis.
Main Results:
- Delta activity was predominant in all age groups, showing a marked increase upon loss of consciousness.
- Alpha and beta activity emerged around 6 months of age, increasing with age.
- Infants (0-5 months) exhibited sustained high Delta activity intraoperatively; faster frequencies decreased upon regaining consciousness.
Conclusions:
- Significant age-specific differences in perioperative EEG signatures were observed in children aged 1 month to 8 years.
- Current EEG monitoring may not be universally applicable across pediatric age groups.
- Development of age-adapted EEG monitoring systems is essential to prevent over- and undersedation in this vulnerable population.
Background:
Age-specific EEG signatures during anesthesia are described in pediatrics, and perioperative monitoring is increasingly advocated; yet most indices and algorithms derive from adult data and may not generalize to early development.
Aims:
The purpose of this study was to characterize perioperative frontal EEGs in young children younger than 8 years.
Methods:
A total of 147 frontal EEGs from children ranging from 1 month to 8 years of age were recorded prospectively under general anesthesia at Charité-Campus Virchow Klinik (CVK). For data acquisition, the Narcotrend Monitor was used, and the raw EEG files were further analyzed in their frequency bands. The patient cohort was divided into four age groups (0-5, 6-11, 12-23, and > 24 months), and EEG signatures were compared between the age groups.
Results:
Delta activity is the predominant frequency in all age groups already in the awake state before induction of anesthesia, with a step increase at loss of consciousness, which is more pronounced in older children. Intraoperatively, alpha- and beta-activity emerge at the age of 6 months and are greater in the older age groups. Infants (0-5 months) remain with a high amount of Delta activity intraoperatively. With the return of consciousness, the faster frequencies gradually decrease, and the EEG is characterized again by a predominant delta-activity in all age groups.
Conclusions:
In this study, we characterized differences in the perioperative EEG signatures of children from 1 month to 8 years from the preoperative awake state during induction and general anesthesia until they regained consciousness from general anesthesia. The EEG readouts differ across age groups, and age-adapted monitoring systems are needed to protect this vulnerable patient group from over- and undersedation.
Trial Registration:
This study was approved by the Charité-University Medicine Berlin's ethics committee (EA2/027/15) and was registered at clinicaltrials.gov (23rd of June 2015/NCT02481999).
