[The relations between otoacoustic emissions and pure tone threshold]
Summary
Transient evoked otoacoustic emission (TEOAE) and distortion products otoacoustic emission (DPOAE) effectively identify hearing loss, but results vary by frequency and age. Even with a "pass" result, hearing loss is still possible.
Area of Science:
- Audiology
- Otoacoustic Emissions
- Hearing Diagnostics
Background:
- Otoacoustic emissions (OAEs) are objective measures of cochlear function.
- Pure tone threshold (PTT) audiometry is the standard for assessing hearing sensitivity.
- Understanding the correlation between OAEs and PTT is crucial for accurate hearing assessment.
Purpose of the Study:
- To determine the relationship between OAE passing rates and pure tone thresholds.
- To evaluate the efficacy of TEOAE and DPOAE in identifying hearing loss across different frequencies and age groups.
Main Methods:
- Transient evoked otoacoustic emission (TEOAE) and distortion products otoacoustic emission (DPOAE) were measured.
- Pure tone thresholds were assessed in individuals with normal hearing and sensory hearing loss.
- OAE passing rates were analyzed based on age and PTT severity.
Main Results:
- TEOAE effectively detects hearing loss at 2 kHz and below.
- Passing rates for TEOAE and 2 kHz DPOAE were consistent across age groups.
- 4 kHz DPOAE passing rates were lower in individuals over 50 years old.
- OAE passing rates decreased as pure tone thresholds increased, indicating reduced cochlear function.
Conclusions:
- TEOAE is sensitive to low- and mid-frequency hearing loss.
- Combined TEOAE and DPOAE measurements offer comprehensive hearing loss information at key frequencies (0.5-4.0 kHz).
- A "pass" result in OAE does not entirely rule out hearing loss, necessitating careful interpretation.
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