AA222 Additional Information Page 31
4.2.2.7 Eustachian tube function – patulous Eustachian tube
Make sure that you select the test labeled as Patulous 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 AA222, it is not uncommon to measure a patient’s heartbeat.
By rotating the wheel, you can select and change the following settings.
B
While selecting this instruction, 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 AA222 for easy typing options including the use of special characters.
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