title: Analysis of Vestibular Evoked Myogenic Potentials and Electrocochleography in Noise Induced Hearing Loss.
abstract: OBJECTIVE
  Our objective was to analyze the electrocochleography (ECoG) and cervical vestibular evoked myogenic potential (cVEMP) results of patients with noise-induced hearing loss (NIHL).
  
  
  METHODS
  The study included 20 patients with NIHL. Pure-tone audiometry, tympanic membrane ECoG, and cVEMP were performed on all patients. The patients were divided into two groups based on averaged thresholds at 4, 6, and 8 kHz; whereby, group 1 comprised patients who had a threshold higher than 68.3 dB HL, whereas group 2 comprised patients with a threshold lower than 68.3 dB HL.
  
  
  RESULTS
  Group 2 had a significantly higher number of patients with abnormal cVEMP values (63% versus 28%) (p=0.028). There was no significant difference in the incidence of ECoG abnormality between the groups (p>0.05), but there was a significant difference in the incidence of recognizable ECoG potentials between the groups (p<0.05). When only patients with vertigo/dizziness were considered, the group with vertigo and a lower degree of hearing loss (group 2) showed a higher incidence of abnormal cVEMP (p<0.05).
  
  
  CONCLUSIONS
  Although the anatomical proximity of the sacculus to the cochlea leads to the consideration of a common involvement of these structures in NIHL, our results did not support the idea of a common and proportional involvement of the vestibular and auditory systems. Our study shows that saccular involvement is disproportionate to auditory involvement in NIHL.
authors.affiliation: Department of Otorhinolaryngology and Head and Neck Surgery, Gülhane Military Medical Academy, Ankara, Turkey. dalgicabdullah@gmail.com.
authors.forename: Abdullah
authors.initials: A
authors.lastname: Dalgıç
authors.forename: Oğuz
authors.initials: O
authors.lastname: Yılmaz
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Hıdır
authors.forename: Bülent
authors.initials: B
authors.lastname: Satar
authors.forename: Mustafa
authors.initials: M
authors.lastname: Gerek
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D001300:Audiometry, Evoked Response / Q000379:methods*; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D004244:Dizziness / Q000175:diagnosis* / Q000503:physiopathology; D007758:Ear, Inner / Q000473:pathology / Q000503:physiopathology; D005072:Evoked Potentials, Auditory; D005260:Female; D006317:Hearing Loss, Noise-Induced / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D014717:Vertigo / Q000175:diagnosis* / Q000503:physiopathology; D058585:Vestibular Evoked Myogenic Potentials