A utilização da resposta auditiva de estado estável para estimar limiares auditivos em indivíduos com perda auditiva neurossensorial / Utilization of auditory steady state response to estimate the auditory threshold in individuals with sensorineural hearing loss

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The diagnosis of hearing loss in the first months of life has been increasingly frequent due to hearing health programs established throughout the country. Thus, techniques and procedures should be developed for accurate identification of the presence and severity of hearing loss, in a population whose motor and cognitive development does not allow response to behavioral methods. The auditory steady state response (ASSR) is an electrophysiological procedure which, different from the brainstem evoked response audiometry (BERA) conducted with tone burst stimuli, allows the establishment of hearing thresholds at multiple frequencies and for both ears, thus reducing the examination time. Moreover, it allows measurement of residual hearing due to the possibility of stimulation at levels close to 130 dBHL. Therefore, the present study aimed to investigate the applicability of ASSR for establishment of hearing thresholds in different severities of sensorineural hearing loss. A total of 65 individuals with sensorineural hearing loss were evaluated, among whom 48 presented mild to deep sensorineural disorder (cochlear), at the age range 7 to 30 years; and 17 presented sensorineural disorder (neuropathy/hearing dyssynchrony) aged 0.6 to 5 years. The evaluation comprised pure-tone threshold audiometry (PTTA) and ASSR analysis for the group with deep sensorineural disorder (cochlear) and only ASSR analysis for the group with sensorineural disorder (neuropathy/hearing dyssynchrony). The results demonstrated that, for individuals with deep sensorineural hearing loss (cochlear), there was significant association (p<0.01) between the thresholds obtained by PTTA and ASSR at frequencies from 0.5 to 4 kHz, with higher agreement in cases with more severe hearing loss. On the other hand, for the sensorineural hearing loss (neuropathy/hearing dyssynchrony), the ASSR was absent in most individuals analyzed. It was concluded that there is significant association between the thresholds obtained by PTTA and ASSR, and that the utilization of this procedure did not provide additional information that might contribute to the diagnosis of sensorineural hearing loss (neuropathy/hearing dyssynchrony), when compared to BERA

ASSUNTO(S)

perda auditiva neurossensorial evoked response audiometry audiometry audiometria sensorineural hearing loss potenciais evocados auditivos steady state estado estável

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