Relationship Between Electroencephalography and Seizure Outcome in Typical Absence Seizures in Children - 04/10/23
, Claire Thompson, PhD a, Odette O'Flaherty, MSc a, Louise Scott, BSc a, Siobhan O'Malley, ANP a, Declan O'Rourke, MD a, b, Bryan Lynch, MB BCh BAO a, b, Kathleen M. Gorman, MD a, b, Emily Conroy, MSc a, Amre Shahwan, MD a, cAbstract |
Background |
Typical absence seizures (TAS) are seen in idiopathic generalized epilepsy. Electroencephalography (EEG) contributes to syndrome characterization and counseling in an area where genetics does not currently play a significant role. Prominent interictal EEG findings are seen in juvenile absence epilepsy (JAE) and are thus thought to be associated with less favorable outcome in any TAS case despite lack of evidence. Our study evaluates EEG findings and their association with seizure outcomes in children with TAS.
Methods |
Retrospective cohort study of 123 children over 10 years with extensive EEG analysis and medical record review. Phone interviews ascertained longer-term outcomes. EEG reviewers were unaware of outcomes.
Results |
Total cohort included 123 children with phone review completed in 98. Median follow-up was 5 years 9 months. Seizure freedom was seen in 59% off antiseizure medicines (ASMs). Interictal findings included focal discharges in 29%, fragments of spike-wave (SW) discharges in 82.1%, and generalized interictal discharges in 63.4%. Interictal SW was more likely in those who slept (100%, 18 of 18) versus those who did not (57%, 60 of 105) (P < 0.001). Outcome analysis found no associations between focal or generalized interictal findings and seizure freedom, relapse off ASM, occurrence of other seizure types, or response to first ASM.
Conclusion |
Focal and generalized interictal EEG discharges are common in children with TAS and are not associated with poorer outcomes. These interictal findings were traditionally associated with JAE rather than childhood absence epilepsy and were thus believed to be associated with potentially poorer outcome, which is probably not the case.
Le texte complet de cet article est disponible en PDF.Keywords : Absence seizures, Interictal EEG, Ictal EEG, Pediatric
Plan
| Funding: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sector. |
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| Author contributions: All authors have reviewed and contributed to the final manuscript and approved for submission. In addition, specific author contributions include the following. S.H. and A.S contributed to study design, data acquisition, data analysis, and drafting of manuscript. K.G. and E.C. contributed to data acquisition and drafting of manuscript. C.T., O.O'F., L.S., S.O'M., D.O'R., B.L., and E.C. contributed to data acquisition. We confirm that we have read the Journal's position on issues involved in ethical publication and affirm that this report is consistent with those guidelines. |
Vol 148
P. 56-64 - novembre 2023 Retour au numéro
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