High-frequency impedance audiometry

Newborns and infants:

• The test is best performed in physiological sleep (it shortens the test time), but it is not necessary.

The test evaluates the susceptibility of the tympanic membrane (i.e., how responsive the tympanic membrane is to pressure changes) and determines the pressure in the middle ear. During the test, a probe is inserted into the ear that simultaneously emits a 1000Hz pure tone. The probe also contains a microphone, which records at what variable pressure applied from the probe (measuring from -300 to + 200 daPa) the eardrum reflects as little sound as possible from itself and passes it further into the middle ear. The test allows you to assess the pressure (the peak of the tympanometric curve) in the middle ear, which in the norm should be from - 100 to + 100 daPa.
The result of the test (measurement) is a graph of the susceptibility (impedance) of the eardrum.

• suspected fluid in the middle ear,.
• perforation of the eardrum,
• A foreign body in the external auditory canal,
• obstruction of the auditory trumpet,
• concave eardrum,
• barotrauma,
• Other pathology in the middle and outer ear.

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