title: Immediate termination of electrical status epilepticus in sleep after hemispherotomy is associated with significant progress in language development.
abstract: To study the effect of hemispherotomy on electrical status epilepticus in sleep (ESES) and language development.
  
  
  
  Children with a confirmed diagnosis of ESES prior to surgery and a minimum of 24 months of developmental follow-up data were compared with age-matched controls without ESES. Language quotients (LQs) were calculated before and after surgery.
  
  
  
  Eleven patients (five females, six males) and 21 controls (11 females, 10 males) were included. Before surgery a significantly higher number of children in the study group (n=9) demonstrated severe developmental delay compared with children in the control group (n=13; p=0.015). In the study group ESES remitted immediately after surgery in 10 children, and a significant catch-up in LQs was observed in this group (preoperative mean 40.0 [standard deviation (SD) 22.2, interquartile range (IQR) 30.0-62.0]; postoperative mean 73.0 [SD 33.5, IQR 41.0-97.0]; p=0.037). There was no significant difference compared with controls at last follow-up after surgery (study group: five with severe impairment; control group: eight with severe impairment [p=0.971]). Overall, a favourable developmental outcome was associated with freedom from seizures (seizure-free group: median preoperative LQ 61.5, median postoperative LQ 78.0 [p=0.017]; seizure group: median preoperative LQ 35.5, median postoperative LQ 56.5 [p=0.273]) and antiepileptic drug withdrawal (off medication: median preoperative LQ 49.5, median postoperative LQ 78.0 [p=0.011]; on medication: median preoperative LQ 78.0, median postoperative LQ 83.5 [p=0.889]).
  
  
  
  Children with ESES showed significantly lower preoperative language abilities than children without ESES. In cases with remission of ESES after surgery, marked improvement in LQs was noticed. This improvement cannot be fully explained by seizure-freedom alone as seizure-free children without preoperative ESES showed less improvement.
authors: Epilepsy Monitoring Unit, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna/General Hospital (AKH) Vienna, Vienna, Austria.
authors: Gudrun
authors: G
authors: Gröppel
authors: Department of Neurosurgery, Medical University of Vienna/General Hospital (AKH) Vienna, Vienna, Austria.
authors: Christian
authors: C
authors: Dorfer
authors: Epilepsy Monitoring Unit, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna/General Hospital (AKH) Vienna, Vienna, Austria.
authors: Anastasia
authors: A
authors: Dressler
authors: Epilepsy Monitoring Unit, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna/General Hospital (AKH) Vienna, Vienna, Austria.
authors: Angelika
authors: A
authors: Mühlebner
authors: Epilepsy Monitoring Unit, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna/General Hospital (AKH) Vienna, Vienna, Austria.
authors: Barbara
authors: B
authors: Porsche
authors: Institute of Neurology, Medical University of Vienna/General Hospital (AKH) Vienna, Vienna, Austria.
authors: Johann A
authors: JA
authors: Hainfellner
authors: Department of Neurosurgery, Medical University of Vienna/General Hospital (AKH) Vienna, Vienna, Austria.
authors: Thomas
authors: T
authors: Czech
authors: Epilepsy Monitoring Unit, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna/General Hospital (AKH) Vienna, Vienna, Austria.
authors: Martha
authors: M
authors: Feucht
mesh_terms: D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D004569:Electroencephalography; D005260:Female; D005500:Follow-Up Studies; D038421:Hemispherectomy / Q000379:methods*; D006801:Humans; D007223:Infant; D007804:Language Development; D008297:Male; D012893:Sleep Wake Disorders / Q000209:etiology*; D013226:Status Epilepticus / Q000150:complications* / Q000601:surgery*; D016896:Treatment Outcome