Maico MI 24, Operating Instructions Manual

Page: 26 / 53

Operating Instructions MI 24, MI 24h
24
6.4 Taking the ipsilateral measurement
Carry out the measurement as
described in chapter 4.4 “Recording
the Tympanogram.” The Stapedius
reflex
is measured after the
measurement of the tympanogram.
During the measurement of the
Stapedius reflex the change of the
compliance is represented in real
time on the LCD. When the test is
finished the curves for the changes
of compliance at 500 Hz, 1000 Hz,
2000 Hz and 4000 Hz are shown in
four separate graphs at the bottom
of the measurement screen (see
Figure 20). Below each curve is the
test level where a Stapedius reflex
was registered automatically. This is
indicated by a
Pass below the
frequency. If no reflex was detected, a Fail is reported and the maximum level is
shown.
You can judge this by watching the real time graph if you have a real Stapedius reflex
or only disturbance and artifacts. The lower dotted zero-line of a graph indicates the
measured compliance without a test sound. All the positive or negative changes of
compliance are shown as deviation from the zero-line. If a Stapedius reflex occurs,
the compliance increases and the curve rises. The box which appears during the test
symbolizes the threshold at which the
MI 24 accepts a change of compliance as a
valid Stapedius reflex
.
Status
READY
Ear Volume
Compliance
Pressure
Gradient
Impedance Ipsi Right
ml
3
2
1
0
-600 -300 300 daPa
1
100
500 Hz I
4
95
4000 Hz I
3
100
2000 Hz I
2
100
1000 Hz I
AUTO dB Scale
0.94 ml
0.81 ml
- 37 daPa
32 daPa
PASS PASS PASS PASS
Figure 20
Example of a normal tympanogram
with ipsilateral reflex results