Impedance Audiometry

Impedance audiometry, also known as tympanometry, is a diagnostic test used to assess the function and condition of the middle ear and the mobility of the eardrum (tympanic membrane). This test provides valuable information about ear health, the presence of middle ear problems, and can complement pure-tone audiometry in diagnosing various types of hearing disorders. Here is a description of impedance audiometry:

Purpose:

Impedance audiometry is primarily used to evaluate the middle ear's ability to conduct sound efficiently and to assess the condition of the eardrum and the middle ear space. It is particularly helpful in diagnosing conductive hearing loss and identifying problems such as fluid buildup in the middle ear (otitis media), eardrum perforations, or issues with the ear's pressure regulation.

Test Setup:

Impedance audiometry is typically performed in a quiet, soundproof room or booth, similar to pure-tone audiometry.

Equipment:

The test is conducted using an impedance audiometer, which consists of a probe that is placed in the ear canal. The audiometer produces varying air pressure and tones to measure the ear's impedance, or its opposition to the flow of sound.

Procedure:

• A soft ear tip or probe is inserted into the patient's ear canal. The probe emits varying air pressure and sound tones while measuring the ear's response.
• The test assesses the ear's impedance and acoustic reflexes by analyzing how the eardrum responds to changes in air pressure and sound.