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Updated: Jun 29, 2026
Application of an Amplitude-integrated EEG Monitor (Cerebral Function Monitor) to Neonates
Published on: September 6, 2017
Utility of prolonged bedside amplitude-integrated encephalogram in encephalopathic infants
Amit M Mathur1, Lee D Morris, Fafa Teteh
1Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri, USA. mathur_a@kids.wustl.edu
Insights
Prolonged amplitude-integrated electroencephalogram (aEEG) monitoring after conventional EEG (cEEG) better detects subclinical seizures and evolving brain activity in newborns. This offers a practical alternative for continuous monitoring in neonatal units.
Area of Science:
- Neonatal Neurology
- Clinical Neurophysiology
- Pediatric Epilepsy
Background:
- Neonatal encephalopathy and seizures require continuous EEG monitoring for accurate diagnosis and management.
- Conventional EEG (cEEG) provides a brief snapshot, potentially missing critical information.
- Limited-channel amplitude-integrated EEG (aEEG) offers a more accessible, prolonged monitoring option.
Purpose of the Study:
- To evaluate if prolonged bedside aEEG monitoring enhances subclinical seizure detection and background EEG assessment in neonatal encephalopathy.
- To compare the utility of aEEG with standard cEEG in neonatal units with limited continuous monitoring resources.
Main Methods:
- Prospective study of 25 term neonates with seizures or encephalopathy.
- All infants underwent a 1-hour cEEG followed by 12-24 hours of aEEG monitoring.
- EEG data analyzed by an epileptologist, compared with cEEG reports and MRI findings.
Main Results:
- aEEG and cEEG showed similar background classification in 83% of infants.
- Prolonged aEEG detected background evolution in 4 additional infants and more subclinical seizures (8/14) than cEEG.
- Normal background on both EEG types correlated with normal MRI; severe abnormality correlated with abnormal MRI.
Conclusions:
- Prolonged aEEG provides comparable background activity assessment and improved seizure detection compared to standard cEEG.
- Limited-channel aEEG is a pragmatic alternative for longitudinal monitoring in neonatal units lacking continuous cEEG.
- aEEG monitoring complements cEEG in predicting short-term outcomes in term neonates with seizures or encephalopathy.
Abstract:
We hypothesized that prolonged bedside limited-channel amplitude-integrated electroencephalogram (aEEG) monitoring following a standard 1-hour conventional electroencephalogram (cEEG) would increase the detection of subclinical seizures and allow continuous evaluation of the background EEG in neonatal encephalopathy. This may identify complementary roles for these EEG technologies in neonatal units where continuous cEEG monitoring may not be readily available. We prospectively recruited 25 term neonates with a diagnosis of neonatal seizures or encephalopathy. All infants underwent a standard 1-hour cEEG followed by 12 to 24 hours of aEEG monitoring. Data from the aEEG (plus the raw signal) were analyzed by an epileptologist and compared with information obtained from the clinical report of the cEEG. aEEG and cEEG data were available for 24 infants. Results from magnetic resonance imaging (MRI) performed at 7 to 10 days of life were available in 23/24 infants. Background classification on cEEG and aEEG was similar in 83% of patients. Five of 24 infants had normal background on cEEG. Prolonged aEEG detected evolution of background from initially normal to moderately abnormal in an additional four infants. It also detected more subclinical seizures than the 1-hour cEEG in 8/14 infants. Normal background on aEEG and cEEG was associated with normal MRI results, and severe background abnormality (5/24) on both aEEG and cEEG was associated with abnormal MRI results. Data obtained from prolonged aEEG (plus raw EEG) provide similar background activity, enhance seizure detection, and complement standard cEEG in predicting short-term outcomes, based on MRI, in term neonates with seizures or encephalopathy. Limited-channel aEEG technology may provide a pragmatic alternative for longitudinal monitoring of newborn infants with encephalopathy in neonatal units where prolonged video EEG monitoring is not feasible.
