19 Characterization of Neurodevelopmental Comorbidities within a Paediatric Population with a First Epileptic Seizure

Abstract Background Epilepsy is the most common paediatric neurological disorder. An estimated 4% of the general population will have an unprovoked epileptic seizure at least once in their lifetime. Of these, about 40% will experience a recurrence within two years. The International League Against Epilepsy (ILAE) established that one part of the definition of epilepsy was the onset of a first seizure with a recurrence risk of more than 60% over 10 years. However, except for epileptiform abnormalities and a structural-metabolic etiology present on the electroencephalogram (EEG), very few known factors are consistently associated with first epileptic seizures. Objectives Our study’s objective was to characterize neurodevelopmental comorbidities, namely attention-deficit hyperactivity disorder (ADHD), autism spectrum disorder (ASD), anxiety, depression, gross motor delay and language delay, in patients following a first epileptic seizure as compared to healthy controls. Design/Methods Children referred in neurology for a first suspected epileptic seizure, between June 2016 and June 2018 at the Centre Hospitalier Universitaire Sainte-Justine (CHUSJ), underwent EEG and neurological evaluations. For screening of comorbidities, parents completed age-appropriate M-CHAT-R/F, SCQ, ASQ-3, SCARED, and CES-DC questionnaires via a web platform adapted from CHADIS. Questionnaire scores were adjusted for age and sex and analyzed via a Student’s t-test. The prevalence of comorbidities was analyzed via a chi-square statistical test. Results A total of 72 subjects aged between 1 month and 18 years (42 males, 30 females) were enrolled in the study. Patients with a first epileptic seizure (n=37) showed significantly more comorbidities compared to the healthy subjects (54% vs. 31%, p<0.05). Patients with a first epileptic seizure had significantly more language delay (50%, p=0.015), ADHD (45%, p=0.008), and a significantly higher score in the Social Communication Questionnaire (SCQ) (p=0.03), compared to healthy subjects. Conclusion Our results confirm the increased rate of comorbidities in children with a first epileptic seizure and, thus, the importance of concomitant screening for those disorders at the time of the initial presentation.