title: A Special Electroencephalography Pattern Might Help in the Diagnosis of Antibody-positive Encephalitis.
abstract: BACKGROUND
  Patterns observed with electroencephalography (EEG) for patients who have encephalitis are usually known as generalized nonspecific cerebral abnormalities. The aim of this study was to investigate the presence of a special EEG pattern for patients with encephalitis and to explore features related to this special and uncommon pattern.
  
  
  METHODS
  EEG monitoring was performed for every patient aged >15 years with encephalitis who was hospitalized between December 2011 and March 2014. Clinical characteristics and EEG recordings were collected and evaluated.
  
  
  RESULTS
  Fifty-two patients with encephalitis were enrolled in our study with a 2-h median EEG recording time, and extreme beta brushes (EBBs) occurred in 17 patients (32.7%). Its presence was not significant regarding gender, age, psychiatric medication use, EEG rhythmic disorganization (P > 0.05). Nevertheless, among the patients with EBBs, nine patients (52.9%) had epileptic seizures that had a significant detection rate (P < 0.05); moreover, the cerebrospinal fluid (CSF) or serum of 15 patients (88.2%) with EBBs was positive for antibodies (P < 0.05). Four patients (23.5%) who had EBB had corresponding regional distributions on neuroimaging scans. The EBBs completely correlated with the regional distributions of spike discharges for four patients.
  
  
  CONCLUSIONS
  EBB is a special EEG pattern for patients with encephalitis, especially those with epileptic seizures or who have antibody-positive CSF/serum, and should be considered in clinical practice.
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Mei
authors.affiliation: Department of Neurology, Beijing Xuanwu Hospital, Capital Medical University, Beijing 100053, China.
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Ye
authors.forename: Yu-Ping
authors.initials: YP
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Tong
authors.initials: T
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004569:Electroencephalography / Q000379:methods*; D004660:Encephalitis / Q000175:diagnosis* / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D055815:Young Adult