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Revista CEFAC

On-line version ISSN 1982-0216

Abstract

FERNANDES, Luciana Castelo Branco Camurça; GIL, Daniela; MARIA, Samylla Lopes de Santa  and  AZEVEDO, Marisa Frasson de. Brainstem auditory evoked potential in subjects with sensorineural hearing losses. Rev. CEFAC [online]. 2013, vol.15, n.3, pp. 538-545.  Epub Mar 22, 2012. ISSN 1982-0216.  http://dx.doi.org/10.1590/S1516-18462012005000018.

PURPOSE: to characterize the results of ABR via bone in subjects with mild sensorineural hearing loss, comparing these data with the control group made up by subjects with normal hearing. METHOD: the sample consisted of 40 adults of both genders, 18 - 55 year old, divided into a control group of 30 subjects with normal hearing and a study group made up of 10 subjects with mild sensorineural hearing loss. ABR was carried out with Interacoustics brand EP15. The stimulus was the click presentation rate of 27.7 / s, for a total of 2000 stimuli with rarefaction polarity for AC and switched to VO and band-pass filter of 50Hz and 3000Hz. RESULTS: in subjects with mild sensorineural loss, there were no statistically significant differences between the ABR threshold via air and bone, and those thresholds were equivalent, with air-bone gap of less than 10dB. The latencies of wave V in the electrophysiological threshold and 50 dBnNA were lower latencies than those noted in subjects with normal hearing. CONCLUSION: we found electrophysiological thresholds via bone equivalent to thresholds obtained via air, with the presence of air-bone gap being less than 10dBnNA. Thus, the use of VO by ABR provides data for a more-detailed characterization of the type of hearing loss.

Keywords : Hearing; Electrophysiology; Hearing Loss.

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