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

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. The study included 15 subjects with and 15 subjects without a history of otitis media in th...

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Bibliographic Details
Published in:	Medical science monitor Vol. 18; no. 4; pp. MT27 - MT31
Main Authors:	De P Campos, Ualace, Sanches, Seisse G, Hatzopoulos, Stavros, Carvallo, Renata M M, Kochanek, Krzysztof, Skarżyński, Henryk
Format:	Journal Article
Language:	English
Published:	United States International Scientific Literature, Inc 01-04-2012
Subjects:	Audiometry, Pure-Tone Behavior - physiology Case-Control Studies Diagnostics and Medical Technology Ear, Middle - physiopathology Humans Otoacoustic Emissions, Spontaneous - physiology Perceptual Distortion - physiology Signal-To-Noise Ratio Young Adult
Online Access:	Get full text
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Summary:	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. 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 6384 Hz. 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. 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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Funds Collection Data Interpretation Literature Search Data Collection Study Design Manuscript Preparation Statistical Analysis
ISSN:	1234-1010 1643-3750
DOI:	10.12659/MSM.882605