title: Middle ear impedance measurements in large vestibular aqueduct syndrome.
abstract: OBJECTIVE
  To assess the effect of inner ear pressure on middle ear impedance in patients with large vestibular aqueduct syndrome (LVAS).
  
  
  METHODS
  Data from admittance tympanometry and multifrequency tympanometry on 8 LVAS patients and control subjects were studied.
  
  
  RESULTS
  Static acoustic compliance (SAC) values for the ears with stable sensorineural hearing loss (SNHL) were within the limits of the mean values of control groups except for two ears. The resonance frequency (RF) values of the ears with stable SNHL were lower than the mean values of control groups except for three ears. SAC values for the two ears with fluctuating SNHL were lower and the RF values were higher than the mean values of control groups.
  
  
  CONCLUSIONS
  Decreased SAC values and increased RF values found in the ears with fluctuating SNHL might be an indirect indicator of increased inner ear pressure, while low RF values in the ears with stable SNHL might reflect the decreased inner ear impedance.
authors.affiliation: Ege University, Medical School, Department of Otorhinolaryngology, Izmir, Turkey. cembilgen@hotmail.com
authors.forename: Cem
authors.initials: C
authors.lastname: Bilgen
authors.forename: Günay
authors.initials: G
authors.lastname: Kirkim
authors.forename: Tayfun
authors.initials: T
authors.lastname: Kirazli
mesh_terms: D000158:Acoustic Impedance Tests / Q000295:instrumentation; D000293:Adolescent; D000328:Adult; D002648:Child; D004432:Ear, Middle / Q000503:physiopathology*; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D008297:Male; D012720:Severity of Illness Index; D013577:Syndrome; D014723:Vestibular Aqueduct / Q000503:physiopathology*; D015837:Vestibular Diseases / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology*; D055815:Young Adult