Alteration of distortion product otoacoustic emission input/output functions in subjects with a previous history of middle ear dysfunction

Autor(es)

Campos, Ualace De P. ^[1] ; Sanches, Seisse G. ^[1] ; Hatzopoulos, Stavros ^[2] ; Carvallo, Renata M. M. ^[1] ; Kochanek, Krzysztof ^[3] ; Skarzynski, Henryk ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Med, FMUSP, Sao Paulo - Brazil

^[2] Univ Ferrara, Dept Audiol, I-44100 Ferrara - Italy

^[3] Inst Physiol & Pathol, Warsaw - Poland

• Tipo de documento: Artigo Científico
• Fonte: Medical Science Monitor; v. 18, n. 4, p. MT27-MT31, APR 2012.
• Citações Web of Science: 3

Resumo

Background: The aim of this study was to investigate the effects of sub-clinical alterations on the amplitudes and slopes of the DPOAE input-output responses from subjects with previous history of middle ear dysfunction. Material/Methods: The study included 15 subjects with and 15 subjects without a history of otitis media in the last 10 years. All participants were assessed with acoustic immittance, pure-tone audiometry, and DPOAEs. For the later, I/O functions and I/O slopes were estimated at 1501, 2002, 3174, 4004 and 6384Hz. Results: No statistically significant differences were found between the 2 groups in terms of behavioral thresholds. The group with a previous history of middle ear dysfunction presented significantly lower mean DPOAE amplitudes at 2002, 3174 and 4004 Hz. In terms of DPOAE slopes, no statistically significant differences were observed at the tested frequencies, except at 3174 Hz. Conclusions: Middle ear pathologies can produce subclinical alterations that are undetectable with traditional pure-tone audiometry. The data from the present study show that reduced amplitude DPOAEs are associated with a previous history of middle ear complications. The corresponding DPOAE slopes were affected at only 1 tested frequency, suggesting that the cochlear non-linearity is preserved. Considering these results, it remains to be elucidated to what degree the DPOAE amplitude attenuation interferes with higher-order auditory tasks. (AU)

• Processo FAPESP: 08/05151-9 - Efeito da função da orelha média e da curva de crescimento no nível de respostas das EOAPD
• Beneficiário: Ualace de Paula Campos
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto