title: Effects of Intralabyrinthine Hemorrhage on the Cochlear Elements: A Human Temporal Bone Study.
abstract: OBJECTIVE
  To compare histopathologic findings in the cochlea of human temporal bones with versus without intralabyrinthine hemorrhage.
  
  
  BACKGROUND
  Hemorrhagic labyrinthitis can cause sensorineural damage, sudden hearing loss, and vertigo. Yet, to our knowledge, no studies have quantitatively described histopathologic effects of intralabyrinthine hemorrhage on the elements of the cochlea.
  
  
  METHODS
  We analyzed 46 human temporal bone samples from 23 patients with unilateral intralabyrinthine hemorrhage (23 samples from ears with intralabyrinthine hemorrhage and 23 samples from contralateral ears without). We noted the location of hemorrhage in the inner ear, the degree of endolymphatic hydrops, the number of spiral ganglion cells and hair cells, mean loss of fibrocytes in spiral ligament, and areas of the stria vascularis and spiral ligament.
  
  
  RESULTS
  Intralabyrinthine hemorrhage caused significant loss of outer hair cells in the lower basal (p = 0.001), upper basal (p = 0.005), and lower middle (p = 0.012) cochlear turns. The degree of endolymphatic hydrops was significantly different between the hemorrhagic and contralateral sides (p = 0.011). But we found no significant difference between the 2 sides in the number of inner hair cells, spiral ganglion cells, and fibrocytes, or in the areas of the stria vascularis and spiral ligament between the two groups (p > 0.05).
  
  
  CONCLUSIONS
  These findings suggest that such patients could be good candidates for hearing aid or cochlear implant if they have profound sensorineural hearing loss.
authors.affiliation: *Department of Otolaryngology, University of Minnesota, Minneapolis, Minnesota, U.S.A. †Gebze Fatih State Hospital, Otolaryngology Division, Gebze, Kocaeli, Turkey ‡Giresun A. Ilhan Ozdemir State Hospital, Otolaryngology Division, Giresun, Turkey §Paparella Ear Head and Neck Institute, Minneapolis, Minnesota, U.S.A.
authors.forename: Serdar
authors.initials: S
authors.lastname: Kaya
authors.forename: Ömer
authors.initials: Ö
authors.lastname: Hizli
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Schachern
authors.forename: Michael M
authors.initials: MM
authors.lastname: Paparella
authors.forename: Sebahattin
authors.initials: S
authors.lastname: Cureoglu
mesh_terms: D003051:Cochlea / Q000473:pathology*; D006470:Hemorrhage / Q000150:complications* / Q000473:pathology*; D006801:Humans; D007762:Labyrinthitis / Q000150:complications* / Q000473:pathology*; D008297:Male; D013701:Temporal Bone / Q000473:pathology