A Clinical-Electrographic Profile of Neonatal Seizures and Their Etiologies in a Single Level III Neonatal Intensive Care Unit

Background: Seizures are the most frequent neurological emergency in neonatal period and can be associated with significant mortality and subsequent neuro-developmental disability if not recognized and managed early. Repaid identification of neonatal seizures and evaluation is critically required to identify and treat the underlying etiology. Clinicians face a major challenge in diagnosing and treating neonatal seizure because of inconspicuous clinical presentation, variable electro-clinical correlation. Assessing the combination of clinical presentation, etiological factors, different diagnostic tools, and treatments, can broaden the knowledge and understanding towards neonatal seizure providing better management and outcome. Objective: To study the characteristics of clinical and electrographic profile of neonatal seizure and the relations to their etiologies in neonatal intensive care unit. Methods: This is a descriptive cross sectional retrospective study of electronic health records with ICD- 10 diagnosis of neonatal seizure from birth to 28 days, who were admitted to neonatal intensive care unit at Sheikh Shakhbout Medical City between January 2020 to December 2021. Clinical data obtained including basic demographics: gender, gestational age, mode of delivery, birth weight, and Apgar score. Onset and type seizure, type of antiepileptic drugs administered, EEG findings, brain imaging, results of relevant laboratory tests and etiology of seizure were collected. Results: Total 31 neonates included in the study. Majority were male (71%), term (87%), and birth weight >2,5 kg (90%). Seizure within 24 hours was 58% and semiology was focal clonic in 32% of patient. No events in EEG in 81% and 6% had electrographic seizure (n=2). 94 % were treated with anti-convulsant, 86% of them before EEG. The majority (86%) received phenobarbitone as 1st line treatment and 83% received monotherapy. Leading causes of seizure were HIE (48%) followed by Vascular causes (16%). Seizure within 24 hours caused mainly by HIE (61%) and 60% of neonates with vascular and all infectious and genetic causes had seizure after 24 hours. In vascular causes, (60%) presented with focal clonic seizure. 60% of Multifocal epileptiform activity seen in HIE whereas focal presented more in vascular patient (36%). In HIE cases, 53% had normal brain MRI and 47% were abnormal. All cases with vascular causes had diagnostic abnormal MRI. The majority of HIE cases (87%) and all vascular cases received monotherapy. Conclusion: In this descriptive study of neonatal seizure, certain demographic data, clinical and electrographic characteristics had established links to their etiologies. Clinical events captured during EEG with no electrographic seizure are classified as non-epileptic clinical phenomenon. Diagnostic utility of EEG is required in diagnosis of involuntary movements and avoid unnecessary anti-seizure medications. Understanding the clinical-electrographic profile of neonatal seizure helps in the early recognition of specific etiologies, allowing an early diagnosis by organized diagnostic approach and management.