Interacoustics AT235 Additional Information

AT235 Additional Information Page 27
3.5 Eustachian Tube Function – Patulous Eustachian Tube
Make sure that the test labeled as Patulous is selected from the list of tests on the left of the screen.
The Eustachian tube function test for a patulous Eustachian tube or ETF 3 monitors the compliance of the
eardrum over a certain period of time. If the Eustachian tube is spontaneously open, you expect to measure
compliance changes due to movements of the eardrum. Typically, you expect to recognize the rhythm of
breathing. Measuring the ETF 3 in a healthy subject only shows spontaneous disturbances in the compliance
due to probe movement, acoustical disturbances in the patient’s surroundings or spontaneous movements of
the eardrum. With the precision of the AT235, it is not uncommon to measure a patient’s heart beat.
When rotating the wheel, the following settings can be selected and changed.
A
Auto run. Once enabled for a test auto run will cause this test to be automatically run as part of
the protocol.
B
While this instruction is selected, press the button to open a pop up in which you
can change the instruction that is shown at the start of the measurement. Connect a pc keyboard
to the USB port of the AT235 for easy typing options including the use of special characters.
C
Test Duration. Here the test duration is set and can vary from 30 up to 150 seconds.

Interacoustics AT235 Specifications

General

Brand	Interacoustics
Model	AT235
Category	Measuring Instruments
Language	English