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Electrical brain activity in preterm infants at risk for intracranial hemorrhage
M van de Bor1, J G van Dijk, F van Bel
1Department of Pediatrics, Division of Neonatology, University Hospital Leiden, The Netherlands.
Insights
Preterm birth impacts electroencephalographic background activity in infants. Periventricular-intraventricular hemorrhage can alter these patterns, showing depressed brain activity.
Area of Science:
- Neonatal neurology
- Neurophysiology
Background:
- Preterm birth (< 32 weeks' gestation) poses risks to infant brain development.
- Electroencephalography (EEG) is crucial for assessing neonatal brain function.
- Periventricular-intraventricular hemorrhage (PIVH) is a common complication in preterm infants.
Purpose of the Study:
- To investigate the effects of preterm birth on electroencephalographic (EEG) background activity.
- To examine the relationship between gestational age and EEG activity in preterm infants.
- To assess the impact of periventricular-intraventricular hemorrhage (PIVH) on EEG patterns.
Main Methods:
- 24-hour, four-channel EEG recordings were obtained from 20 preterm infants (< 32 weeks' gestation) on days 1, 3-5, and 7-9.
- EEG recordings were analyzed to quantify the percentage of time spent in different sleep stages (I, II, III).
- Infants were monitored for the development of periventricular-intraventricular hemorrhage (PIVH).
Main Results:
- In infants without PIVH, gestational age positively correlated with continuous EEG activity (stage I) and negatively with discontinuous activity (stage III) on day 1.
- These gestational age-related EEG patterns were not observed in infants who developed PIVH.
- EEG background activity showed depression during the onset or extension of PIVH.
Conclusions:
- Gestational age influences EEG background activity in preterm infants without PIVH.
- The development of PIVH disrupts the expected relationship between gestational age and EEG activity.
- PIVH is associated with significant depression of neonatal EEG background activity.
Abstract:
We studied the effect of preterm birth on electroencephalographic background activity in 20 infants < 32 weeks' gestation. Six infants developed periventricular-intraventricular hemorrhage during the study period. Four-channel 24-h cassette recordings were obtained on day 1, 3-5 and 7-9. For each of the 24-h recordings, the percentage of the time showing stage I (continuous activity), stage II (mixed activity) and stage III (discontinuous activity) epochs was calculated. In infants without periventricular-intraventricular hemorrhage, a positive linear relationship between gestational age and continuous activity and a negative linear relationship between gestational age and discontinuous activity existed in the first day recordings; in infants with periventricular-intraventricular hemorrhage, such relationships were not found. To determine if the changes in continuous and discontinuous activities during the first week of extrauterine life were different from the expected changes during a corresponding time in utero, we calculated the expected amounts of stage I and III changes for each infant. The actual changes were not significantly different from the expected values in both study groups. However, during the onset and/or extension of periventricular-intraventricular hemorrhage, depression of the electroencephalographic background activity was found.