Interactive effects of the middle ear pathology and the associated hearing loss on transient-evoked otoacoustic emission measures.

Sixty-three children aged 4 to 17 years were examined by tympanometry, pure-tone audiometry, transient-evoked otoacoustic emissions (TEOAEs), and otoscopy to evaluate the effects of middle ear pathologies and the associated hearing loss on TEOAEs. TEOAE measures were highly specific (93.8%) in identifying normal ears that passed both audiometric and tympanometric criteria. The sensitivity for identifying abnormal ears was also reasonable (83. 3%). The effects of the middle ear abnormality were most significant, regardless of the degree of hearing loss, when the tympanogram was type B with normal volume measures, which is associated with reduced eardrum mobility and middle ear fluid. The middle ear conditions producing the greater negative pressure, which in turn led to more conductive hearing loss, also produced more TEOAE failures. The mere presence of an open ventilation tube was not a determining factor for absent TEOAEs because 60% of the open ventilation tubes had normal TEOAEs. Provided that the clinician understands the effects of middle ear pathologies on otoacoustic emissions, TEOAEs can be a great asset for diagnosis of both otologic and audiologic disorders.