Chipaux M1,2Szurhaj W1,3Vercueil L1,4,5Milh M1,6Villeneuve N1,6,7Cances C1,8Auvin S1,9,10Chassagnon S1,11Napuri S1,12Allaire C1,12Derambure P13Marchal C1,13Caubel I1,14Ricard-Mousnier B1,15N’Guyen The Tich S1,15Pinard JM1,2,16,17Bahi-Buisson N1,18,19de Baracé C1,20Kahane P1,5,21Gautier A1,22Hamelin S1,21,23Coste-Zeitoun D1,24Rosenberg SD1,25,26Clerson P27Nabbout R18,28,29Kuchenbuch M1,12,30Picot MC1,31,32Kaminska A1,29,33GRENAT Group.

ABSTRACT:

Snapshot on epilepsy in patients referred to tertiary centers and discloses needs for diagnosis and treatment

OBJECTIVE:

To obtain perspective on epilepsy in patients referred to tertiary centers in France, and describe etiology, epilepsy syndromes, and identify factors of drug resistance and comorbidities.

METHODS:

We performed a cross-sectional analysis of the characteristics of 5,794 pediatric and adult patients with epilepsy included in a collaborative database in France between 2007 and 2013. Comparisons between groups used Student’s t-test or Fisher’s exact test for binary or categorical variables. Factors associated with drug resistance and intellectual disability were evaluated in multi-adjusted logistic regression models.

RESULTS:

Mean age at inclusion was 17.9 years; children accounted for 67%. Epilepsy was unclassified in 20% of patients, and etiology was unknown in 65%, including those with idiopathic epilepsies. Etiologies differed significantly in adult- when compared to pediatric-onset epilepsy; however, among focal structural epilepsies, mesial temporal lobe epilepsy with hippocampal sclerosis began as often in the pediatric as in adult age range. Drug resistance concerned 53% of 4,210 patients evaluable for seizure control and was highest in progressive myoclonic epilepsy (89%), metabolic diseases (84%), focal cortical dysplasia (70%), other cortical malformations (69%), and mesial temporal lobe epilepsy with hippocampal sclerosis (67%). Fifty-nine percent of patients with focal structural epilepsy and 69% with epileptic encephalopathies were drug resistant; however, 40-50% of patients with West syndrome and epileptic encephalopathy with continuous spike-and-waves during sleep were seizure-free. Ages at onset in infancy and in young adults shared the highest risk of drug resistance. Epilepsy onset in infancy comprised the highest risk of intellectual disability, whereas specific cognitive impairment affected 36% of children with idiopathic focal epilepsy.

SIGNIFICANCE:

Our study provides a snapshot on epilepsy in patients referred to tertiary centers and discloses needs for diagnosis and treatment. Large databases help identify patients with rare conditions that could benefit from specific prospective studies.

Wiley Periodicals, Inc. © 2016 International League Against Epilepsy.

KEYWORDS:

Drug-resistant epilepsy; Epilepsy database; Epilepsy etiology; Epilepsy syndrome; Epileptic encephalopathy

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