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Παρασκευή 7 Ιουλίου 2017

Early childhood myoclonic epilepsy: An independent genetic generalized epilepsy with myoclonic seizures as the main seizure type

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Publication date: Available online 6 July 2017
Source:Clinical Neurophysiology
Author(s): Zhixian Yang, Jiao Xue, Hui Li, Ping Qian, Xiaoyan Liu, Yuwu Jiang, Yuehua Zhang
ObjectiveTo elucidate the characteristics of the myoclonic seizures alone, or predominant myoclonus combined with generalized tonic-clonic seizures (GTCS) and/or absences, in early childhood, and discuss its classification.MethodsForty-two children were retrospectively recruited between January 2006 and June 2015.ResultsThe mean age of seizure onset was 40.5 months. They were divided into 4 groups: myoclonic seizures alone; predominant myoclonus combined with GTCS; predominant myoclonus combined with absences; predominant myoclonus combined with both GTCS and absences. Interictal EEG showed generalized spike- or polyspike-wave discharges at 2-4 Hz. Seizures were controlled in 22 patients at a mean age of 60.5 months. The psychomotor development was normal (30/37) or mildly delayed (7/37).ConclusionsWe reported a cohort of patients with early childhood myoclonic epilepsy (ECME), with the following characteristics: Seizures started below 5 years old in otherwise normal children; Seizure types included myoclonic seizures alone or combined with GTCS and/or absences; Febrile or afebrile GTCS might appear firstly; Interictal EEG showed generalized spike- or polyspike-wave; Seizures usually were in remission before adolescence with normal development or mild cognitive or behavioral deficits in most.SignificanceECME might be an independent epileptic syndrome not established by International League Against Epilepsy (ILAE) previously.



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