Eustachian Tube Function - Non-Perforated Eardrum - Interacoustics AA222 Additional Information

Impedance audiometer

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AA222 Additional Information

2.6 Eustachian tube function – non-perforated eardrum

The display of the Eustachian tube function test for the non-perforated eardrum shows graphs for the

selected ear in which the three tympanograms of the adapted Williams procedure are plotted. The Williams

procedure keeps the pressure between the first and second tympanogram at the stop pressure, and between

the second and third tympanogram at the start pressure. In between all tympanograms, the original Williams

procedure involves asking the patient to swallow. In order to achieve a larger displacement in the

tympanograms, we advise asking the patient to perform a Valsalva maneuver after the first tympanogram,

then swallowing after the second tympanogram.

The following information is available during testing:

The non-compensated tympanometric curves.

The equivalent ear canal volume where the acoustic admittance (Y) at the starting pressure of the

first tympanogram is taken as the reference value.

The table shows the pressure values at which the three peaks are detected (or the highest

equivalent volume if there is no peak).

An instruction is displayed between the three tympanograms to tell you how to direct the patient. To

continue, press either Continue or Enter.

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