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Revista Brasileira de Otorrinolaringologia

Print version ISSN 0034-7299

Abstract

ANASTASIO, Adriana Ribeiro Tavares; ALVARENGA, Kátia de Freitas  and  COSTA FILHO, Orozimbo Alves. Extratympanic electrocochleography in the diagnosis of auditory neuropathy/auditory dyssynchrony. Rev. Bras. Otorrinolaringol. [online]. 2008, vol.74, n.1, pp.132-136. ISSN 0034-7299.  http://dx.doi.org/10.1590/S0034-72992008000100021.

The brainstem auditory evoked potential (BAEP) is being extensively used as a method for the evaluation of cochlear function in individuals with diagnosis of auditory neuropathy/auditory dyssynchrony (AN/AD). In the absence of otoacoustic emissions, many cases of AN/AD have been diagnosed by the presence of CM identified in the BAEP. AIM: to demonstrate the clinical applicability of extratympanic electrocochleography (ET-Ecochg) in the differential diagnosis of AN/AD compared to the BAEP. METHOD: a 4-year-old child with a diagnosis of AN/AD seen at the Audiological Research Center was submitted to ET-Ecochg with a 2000 Hz tone burst in rarefaction and condensation polarities. RESULTS: the ET-Ecochg exam was illustrated. Using an appropriate protocol, it was possible to demonstrate CM and to confirm it in the Ecochg, with a recording quality superior to that obtained in the BAEP. CONCLUSION: ET-Ecochg permitted a more detailed analysis of CM compared to the BAEP, thus showing clinical applicability for the investigation of cochlear function in AN/AD.

Keywords : audiometry evoked response; child; hearing loss; cochlear microphonic potentials.

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