Denoc | Tympanometry | Impedance Audiometry

Purpose of Impedance Audiometry is to determine the status of the tympanic membrane and middle ear via tympanometry.

Impedance audiometry is done to determine the status of the tympanic membrane and middle ear via tympanometry. The test is also used to evaluate acoustic reflex pathways, which include cranial nerves (CN) VII and VIII and the auditory brainstem. In short, it is middle ear analysis.

Using the results of this test we cannot directly assess auditory sensitivity, although results are interpreted in conjunction with other threshold measures.

Hearing Aid Centre Chennai Impedance Audiometry

Clinical Procedure

A probe with a soft plastic tip is inserted in the ear canal until an airtight seal is obtained.
Later, probe tone (typically 226 Hz) is stimulated into the ear canal while altering air pressure of the external ear canal from +200 to -400 decapascal (daPa).
Result is produced in a form of graph marking admittance as a function of air pressure.

Patient Prior Preparation

No major preparation is required.
For patients who have undergone ear surgery, Impedance is not advisable.
Low-frequency tympanometry is not recommended for infants younger than 7 month.

Average Testing Time

For an effective Impedance audiometry session it fetches around 15 – 20mins for completion. Clinical reports will be provided immediately after test.

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