Transient Evoked Otoacoustic Emissions (TEOAEs) are an objective measure of how well the inner ear, specifically the cochlea, functions. They also provide indirect information about the middle ear's functionality. Essentially, TEOAEs are sounds produced by the inner ear in response to an external auditory stimulus.
Understanding TEOAEs
TEOAEs are a type of Otoacoustic Emission (OAE). Here's a breakdown:
- Otoacoustic Emissions (OAEs): These are low-intensity sounds generated by the outer hair cells of the cochlea (inner ear).
- Transient Evoked: This means the emissions are evoked (or triggered) by a brief, transient stimulus, usually a click or tone burst.
Key Aspects of TEOAEs
| Feature | Description |
|---|---|
| Type of Emission | Otoacoustic Emission (OAE) |
| Stimulus Type | Transient sound, like a click or tone burst. |
| Mechanism | Outer hair cell activity in the cochlea. |
| Function | To assess the functionality of the cochlea and indirectly, the middle ear. |
| Relationship with CEOAE | Both TEOAE and CEOAE refer to OAEs evoked by a click stimulus. |
| Significance | Used to screen for hearing loss, especially in infants and young children where behavioral testing is difficult. |
Clinical Significance
TEOAE tests are non-invasive and relatively quick to administer, making them a valuable tool in audiology. Here are some key points regarding their clinical use:
- Hearing Screening: They are often used in newborn hearing screenings.
- Monitoring Hearing: They can be used to monitor changes in hearing function.
- Diagnosis: They help diagnose inner ear problems.
How TEOAE Testing Works:
- A small probe is placed in the ear canal.
- The probe emits a series of soft clicks or tones.
- The probe also contains a microphone that detects the very faint sounds (TEOAEs) produced by the cochlea in response.
- The presence and characteristics of the TEOAEs help determine the status of the cochlear function.
Example of Practical Use:
- If a TEOAE is present, it generally means that the cochlea and middle ear are functioning within normal limits.
- If a TEOAE is absent or reduced, it may suggest hearing impairment or dysfunction in the cochlea or middle ear.
In summary, TEOAEs are a useful and objective measure of cochlear function, providing essential information for assessing hearing health. The terms "TEOAE" and "CEOAE" both refer to OAE responses elicited by a click.
