Operating Instructions
19
5.5 Understanding the Acoustic Reflex Display & Result
During the measurement of the acoustic reflex the change of the
compliance is represented on the instrument display as shown to the
left. The zero-line at the bottom of the graph indicates the measured
compliance without a test sound. Changes in compliance are shown
as deviations from the zero-line. If a Stapedial
compliance increases and the curve rises. The change in compliance is
shown for each intensity level for the stimulus being presented.
When the test is finished a summary display will show the final
compliance change curve for each stimulus presented in the protocol
Above each curve the test stimulus type is indicated by the following:
500 = 500 Hz pure-tone BN = Broadband noise
1k = 1,000 Hz pure-tone LP = Low pass noise
2k = 2,000 Hz pure-tone HP = High pass noise
4k = 4,000 Hz pure-tone
The stimulus type is followed by a yes/no indication that the
compliance change reached the selected criteria to consider the reflex
present. A compliance change meeting or exceeding the selected
criteria is indicated by a symbol (default criteria is 0.05 ml) followed
by the stimulus intensity (in dB HL) where the Stapedial reflex was
measured. A compliance change failing to meet the criteria is
indicated by a symbol followed by the maximum intensity level.
The overall test outcome is indicated by PASS or REFER in the upper
right corner of the display. This is determined by the pass criteria
established for the protocol.
See Appendix B for additional
information on default protocols.
A correct interpretation of the measuring results can only follow in connection with the tympanogram,
the graphic reflex display (to rule out artifact) and other actual data. But in principle a Stapedial reflex
indicates that the patient hears on the “stimulus ear” and that the sound lead functions.
Note: the acoustic reflex measurement is automatically conducted with pressure held at peak
compliance (compensated).
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