title: [Influence of obstructive sleep apnea-hypopnea syndrome in children on hearing problem].
abstract: OBJECTIVE
  To analyze the effects of obstructive sleep apnea hypopnea syndrome on hearing among children.
  
  
  METHODS
  One hundred and forty three apnea children proved with overnight polysomnography received pure tone audiometry, acoustic impedance test, and lateral nasopharyngeal airway X-ray. Hearing threshold level and blood oxygen's saturation, apnea hypopnea index were analyzed.
  
  
  RESULTS
  Among the 127 cases,63 cases had type C or B tympanograms, and 33 of them had lifted hearing threshold level. The remaining 64 cases had normal hearing and tympanograms. It was found correlation between the A/N ratio and blood oxygen's saturation, and no correlation between the A/N ratio and average of hearing threshold level. There was no correlation between AHI and average of hearing threshold level of each group. Hearing level can be improved after adenoidectomy or adenotonsillectomy.
  
  
  CONCLUSIONS
  The upper airway obstruction due to adenotonsillar enlargement is common in children. It also affects the middle-ear impedance. Although short -term and mild degree of hypoxemia has few influence on hearing threshold level, it may affect cochlear function.
authors.affiliation: Influence of obstructive sleep apnea-hypopnea syndrome in children on hearing problem slliu59@yahoo.com.cn
authors.forename: Shi-Lin
authors.initials: SL
authors.lastname: Liu
authors.forename: Wei-Yi
authors.initials: WY
authors.lastname: Liu
authors.forename: Ya-Mei
authors.initials: YM
authors.lastname: Zhang
authors.forename: Su-Min
authors.initials: SM
authors.lastname: Jiang
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Wang
mesh_terms: D000158:Acoustic Impedance Tests; D001301:Audiometry, Pure-Tone; D001784:Blood Gas Analysis; D002648:Child; D002675:Child, Preschool; D005260:Female; D006309:Hearing; D006801:Humans; D008297:Male; D017286:Polysomnography; D020181:Sleep Apnea, Obstructive / Q000503:physiopathology*