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[The influence of conductive hearing loss on DPOAE-threshold. The effect of an individually optimized stimulation]
P Kummer1, E M Schuster, F Rosanowski
1Abteilung für Phoniatrie und Pädaudiologie, Universitätsklinikum Erlangen. peter.kummer@phoni.imed.uni-erlangen.de
Background:
The DPOAE-threshold, estimated from extrapolated I/O functions, allows an objective assessment of the mechanical sensitivity of the inner ear. In children, the specificity of this diagnostic tool is impaired by conductive hearing loss.
Methods:
In this study, we propose an individual optimization of the primary tone level ratio. This procedure allows the detection of a conductive hearing loss that can be accounted for when estimating the DPOAE-threshold. By means of a simulation using DPOAE-data from 22 normally hearing subjects, the effects of this procedure on the estimation of the DPOAE-threshold are examined.
Results:
An individually optimized DPOAE stimulation distinctly improves the signal-to-noise ratio of the DPOAE which enables an estimation of the DPOAE-threshold for sound conductive losses up to 15 dB. The DPOAE-threshold only worsens in individual cases.
Conclusions:
An individually optimized stimulation paradigm may improve the specificity of inner ear diagnostics with the DPOAE-threshold. A clinical evaluation of the method in children, however, is necessary.
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