Electrographic seizures in neonates correlate with poor neurodevelopmental outcome

Area of Science:

• Neonatal neurology
• Pediatric epilepsy
• Clinical neurophysiology

Background:

• Neonatal seizures are a significant concern in high-risk infants.
• Electrographic seizures (ESz) are often subclinical and require continuous EEG monitoring for detection.
• The impact of ESz burden on neurodevelopmental outcomes requires further elucidation.

Purpose of the Study:

• To quantify the characteristics of electrographic seizures (ESz) in neonates.
• To compare the outcomes of neonates with ESz to those at risk without recorded ESz.
• To investigate the association between ESz burden and neurodevelopmental morbidity and mortality.

Main Methods:

• Retrospective review of EEG and outcome data from 68 at-risk infants undergoing continuous EEG monitoring.
• Comparison of 40 infants with ESz against 28 infants without ESz (control group).
• Outcomes assessed via hospital records, follow-up clinics, and standardized telephone interviews.

Main Results:

• Common etiologies for ESz included asphyxia (n=23) and stroke (n=7).
• ESz duration varied widely, with 43% experiencing prolonged electrographic status.
• ESz occurrence correlated with microcephaly, severe cerebral palsy, and failure to thrive.
• Despite anti-epileptic drug treatment, 30% of infants continued to have ESz.
• Mortality was higher in infants with ESz, particularly those with perinatal asphyxia.

Conclusions:

• A significant association exists between the burden of electrographic seizure activity and adverse neurodevelopmental outcomes, including mortality, in at-risk neonates.
• Perinatal asphyxia coupled with ESz exacerbates the risk of poor neurological outcomes.
• Further research into more effective treatments for neonatal ESz is crucial to determine their independent contribution to poor neurodevelopmental outcomes.