Interacoustics AA222 Additional Information

AA222 Additional Information Page 11
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:
A
The non-compensated tympanometric curves.
B
The equivalent ear canal volume where the acoustic admittance (Y) at the starting pressure of the
first tympanogram is taken as the reference value.
C
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.

Interacoustics AA222 Specifications

General

Brand	Interacoustics
Model	AA222
Category	Measuring Instruments
Language	English