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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
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Average optimal DPOAE primary tone levels in normal-hearing adults
Steven C Marcrum1,2, Peter Kummer1, Christoph Kreitmayer3
1a Department of Otolaryngology , University Hospital Regensburg , Regensburg , Germany .
International Journal of Audiology
|March 25, 2016
Summary
This study refined distortion-product otoacoustic emission (DPOAE) primary tone level optimization by accounting for stimulus variability and test frequency, leading to a more accurate formula for clinical use.
Area of Science:
- Audiology and Hearing Science
- Otoacoustic Emissions Measurement
- Auditory Evoked Potentials
Background:
- Distortion-product otoacoustic emissions (DPOAEs) are crucial for assessing cochlear outer hair cell function.
- Optimizing DPOAE primary tone levels enhances measurement accuracy, but variability factors require further investigation.
- Previous optimization formulas did not fully address stimulus variability and frequency-specific influences.
Purpose of the Study:
- To determine optimal primary tone level (L1-L2) relationships for DPOAE measurements.
- To incorporate stimulus and intra-subject variability into the optimization process.
- To investigate the influence of test frequency on optimal DPOAE parameters.
Main Methods:
- Coupler-based measurements assessed primary tone level stability.
- Experiment 1: DPOAE test-retest reliability was measured across frequencies (1-6 kHz) with L1=L2=65 dB SPL.
- Experiment 2: Optimal L1-L2 relationships were identified across frequencies (1-6 kHz) by varying L1 around the recommended formula, with L2 ranging from 20-75 dB SPL.
Main Results:
- Stimulus variability was minimal (<0.1 dB SPL).
- DPOAE reliability showed a mean standard error of 0.52 dB SPL across frequencies.
- The average optimal L1-L2 relationship was found to be L1 = 0.49 L2 + 41 dB SPL, with a significant frequency effect noted at 6 kHz.
Conclusions:
- The derived L1-L2 formula, incorporating variability, improves the internal validity of DPOAE measurements.
- Accounting for stimulus variability and frequency-specific effects leads to more robust DPOAE optimization.
- This refined approach enhances the reliability of DPOAE testing for audiological assessments.
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