Detalhes bibliográficos
| Ano de defesa: |
2012 |
| Autor(a) principal: |
Ramos, Natália
 |
| Orientador(a): |
Lewis, Doris Ruthy |
| Banca de defesa: |
Não Informado pela instituição |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Pontifícia Universidade Católica de São Paulo
|
| Programa de Pós-Graduação: |
Programa de Estudos Pós-Graduados em Fonoaudiologia
|
| Departamento: |
Fonoaudiologia
|
| País: |
BR
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
https://tede2.pucsp.br/handle/handle/11925
|
Resumo: |
ABR) contributes to the early diagnosis of hearing loss, once it allows a precise assessment of small children in different frequencies. Aim: To analyze air and bone-conduction tone-ABR, in order to estimate hearing thresholds of children from birth to three years of age with normal hearing and with sensorineural or mixed hearing losses. Method: Sample was divided in two groups: group I (GI) with normal hearing newborns submitted to air and bone-conduction tone-ABR at 500, 1000, 2000 and 4000 Hz; the latency and the presence of wave V were analyzed up to 20 dBnHL; group II (GII) comprised children with hearing loss submitted to the same of tone-ABR testing as GI, and also to air and bone-conduction behavioral audiometry. Both procedures were correlated in this group. Results: An increase of wave V latency was observed in GI as the intensity decreased, as well as higher latencies in lower frequencies either for air or bone stimuli. Concerning the air-conduction testing at 500 Hz, wave V was present up to 30 dBnHL, and at 1000 Hz, 91,66% of subjects presented it at 20 dBnHL; all subjects presented responses at 20 dBnHL for the other frequencies. Concerning bone-conduction testing, all subjects presented wave V at 20 dBnHL for all frequencies. GII results showed strong correlation for all frequencies tested air-conduction; however, the bone-conduction testing showed a strong correlation at 500, 1000 and 2000 Hz, and moderate correlation at 4000 Hz. Conclusion: The air and bone-conduction tone-ABR at 500, 1000, 2000 and 4000 Hz is useful in the audiological diagnosis of children in this age group, and there is a good correlation between its results and the behavioral audiometry The latency of wave V behaves inversely proportional to intensity; airconduction responses at 30 dBnHL for 500 Hz, and air and bone-conduction responses at 20 dBnHL for other frequencies may be considered within normal limits |
