Procedure
2. Select the ETF-P test screen, or select the test from
View
>
Immittance
.
Note
•
The pressure range available for positive and
negative pressures (including 400 daPa and -
600 daPa) is commonly used in ETF-P testing. See
Control Panel
>
Positive/Negative pressure
.
3. Click the
Pressure Control
on the Control Panel to start testing.
If Initial pressure is set to
Positive
, the pressure control arrow points upwards.
If Initial pressure is set to
Negative
, the pressure control arrow points downwards.
4. Activate
Pressure Up
or
Pressure Down
to automatically build up pressure until the first open-
ing of the Eustachian tube or max. pressure is reached. The pressure control is automatically
reversed after one of the two criteria has been reached.
5. The end time is always max. 60 seconds, but to facilitate viewing, you can set a lower initial
time value, which will then be shown on the horizontal axis.
If the initial time scale value is exceeded during the measurement, the axis automatically
expands by 10 second steps to a maximum of 60 seconds.
Select
Tools
>
Options
>
ETF-P
>
Time axis
>
Scale(sec.)
.
The ETF-P result
•
The time-pressure graph
The ETF-P test result shows how the pressure changes throughout the measurement as the Eustachian tube briefly
opens and closes.
To view the graphs, click the desired field in the Half-life time table to view the Eustachian tube opening and clos-
ing pressures.
You can adjust the time-pressure graphs manually, if needed. See
•
One curve per ear is saved
•
Eustachian tube openings, daPa
The pressure values denoting the openings and closings of the Eustachian tube are determined from the plateaus
of the curve.
11.8.1
The ETF-P post-analysis tool
You can adjust the time-pressure graphs manually, if needed:
Otometrics - MADSEN OTOflex 100
113
11 Testing with the OTOsuite Immittance module
