Successful Treatment of Electrographic Status Epilepticus of Sleep With Felbamate in a Patient With SLC9A6 Mutation

Pediatr Neurol. 2015 Dec;53(6):527-31. doi: 10.1016/j.pediatrneurol.2015.07.007. Epub 2015 Jul 22.

Abstract

Background: Mutations of SLC9A6 may cause an X-linked clinical syndrome first described by Christianson in 1999 in which affected males exhibited profound intellectual disability, autism, drug-resistant epilepsy, ophthalmoplegia, mild craniofacial dysmorphism, microcephaly, and ataxia.

Methods: We describe a child with an SLC9A6 mutation and an electroencephalographic pattern consistent with electrographic status epilepticus of sleep.

Results: Our patient's electrographic status epilepticus of sleep resolved after treatment with felbamate. Following treatment, he remained seizure-free but did not make significant or lasting gains in language.

Conclusion: Our report extends the clinical epilepsy phenotype in children with SLC9A6 mutations to include electrographic status epilepticus of sleep. In addition, felbamate was an effective treatment for electrographic status epilepticus of sleep in our patient.

Keywords: Christianson syndrome; ESES; SLC9A6; epilepsy; felbamate.

Publication types

  • Case Reports
  • Research Support, N.I.H., Extramural

MeSH terms

  • Anticonvulsants / administration & dosage
  • Anticonvulsants / pharmacology*
  • Ataxia / complications*
  • Ataxia / genetics
  • Child
  • Epilepsy / complications*
  • Epilepsy / genetics
  • Felbamate
  • Genetic Diseases, X-Linked / complications*
  • Genetic Diseases, X-Linked / genetics
  • Humans
  • Intellectual Disability / complications*
  • Intellectual Disability / genetics
  • Male
  • Microcephaly / complications*
  • Microcephaly / genetics
  • Ocular Motility Disorders / complications*
  • Ocular Motility Disorders / genetics
  • Phenylcarbamates / administration & dosage
  • Phenylcarbamates / pharmacology*
  • Propylene Glycols / administration & dosage
  • Propylene Glycols / pharmacology*
  • Sleep Wake Disorders / drug therapy*
  • Sleep Wake Disorders / etiology
  • Sleep Wake Disorders / genetics
  • Sodium-Hydrogen Exchangers / genetics*
  • Status Epilepticus / drug therapy*
  • Status Epilepticus / etiology
  • Status Epilepticus / genetics
  • Treatment Outcome

Substances

  • Anticonvulsants
  • Phenylcarbamates
  • Propylene Glycols
  • SLC9A6 protein, human
  • Sodium-Hydrogen Exchangers
  • Felbamate

Supplementary concepts

  • Mental Retardation, X-Linked, Syndromic, Christianson Type