title: Complement activation in sudden deafness.
abstract: OBJECTIVE
  To test whether complement activation is associated with sudden deafness.
  
  
  METHODS
  Plasma samples obtained from patients in the acute phase of sudden deafness were analyzed for complement activation measured by C3bc levels and terminal complement complex. Comparisons were made with plasma samples from healthy controls.
  
  
  METHODS
  Twenty-five adult patients with unilateral sudden deafness. The criteria for inclusion were symptoms of hearing loss for not longer than 14 days and a hearing loss of 35 dB or more measured at entry.
  
  
  RESULTS
  Levels of C3bc were higher in patients compared with controls (P<.001). There were no differences in the formation of terminal complement complex in patients and controls.
  
  
  CONCLUSIONS
  The elevated levels of C3bc in patients with sudden deafness indicate an activation of the first part of the complement cascade and therefore suspected inflammatory causes. Measurements of C3bc levels might identify patients with sudden deafness who would benefit from treatment with anti-inflammatory drugs.
authors.affiliation: Department of Oto-Rhino-Laryngology, University of Uppsala, Sweden.
authors.forename: L
authors.initials: L
authors.lastname: Nordang
authors.forename: C
authors.initials: C
authors.lastname: Laurent
authors.forename: T E
authors.initials: TE
authors.lastname: Mollnes
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003167:Complement Activation; D003179:Complement C3b / Q000032:analysis; D005260:Female; D003639:Hearing Loss, Sudden / Q000276:immunology*; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D003179:Complement C3b