Operating Instructions MI 34 / MI 34 H
GEBAmi34e.11a.docx
34
850 232/14 08/11
Figure 31
The ETF perforated screen
Right
ETF Perforated
Status
READY
daPa
300
- 300
- 600
40 s
300 daPa
Impedance
Pressure
8.2 ETF test for patients with perforated TM
The test determines if the patient can open his/her Eustachian tube in the
presence of positive pressure delivered by the probe to the external ear
canal. The amount of positive pressure is predetermined and can be set as
high as +300 daPa. While pressure is being applied the patient is instructed
to swallow. If the Eustachian tube opens, a drop in pressure is recorded. A
positive test result will show a ”stair step” effect or a complete drop to 0
daPa as the Eustachian tube opens. The graph displays the vertical axis as
pressure, and the horizontal axis as time.
Highlight ETF
Perforated from the
main menu and and
press the ENTER button
Ï
or press the
ETF
-key
Ò
to advance to the
Eustachian Function
Test screen. It is not
necessary to run a
tympanogram before
running this test.
Press the
ETF
-key
Ò
again and the text ETF
perforated occurs at the upper right corner of the LCD display
Ç
.
Set the maximum pressure using the
Up-Cursor
▴
Î
or
Down-Cursor
▾
Ì
buttons.
Connect the probe as described in chapter 7 “Reflex decay test”. Place an
appropriately sized ear tip firmly on the probe tip. Insert the tip into the ear
canal, well enough to make a seal and provide support for the probe tip.
Instruct the patient not to move or talk until the test is over, as any sound
or movement will give unreliable results.
Press the ENTER button
Ï
when ready to begin the test. Pressure will
increase to the predetermined setting. Let the pressure run a few seconds
at peak pressure to verify a successful seal.
