Eclipse Additional Information Page 77
3.17 Cochlear Microphonic (CM) (if included in your license)
The presence of CM and absence or abnormal ABR is used in the diagnosis of auditory neuropathy spec-
trum disorder (ANSD). When a click ABR is not present or abnormal performing an CM test should be con-
sidered as an important part of the ANSD diagnosing to examine if the response from the OHCs is present
(normal or abnormal).
To have as strong a signal as possible, it is recommended to record from a point as close to the site of gen-
eration as possible.
3.17.1 Protocol settings for CM
The protocol makes used of a fast stimulus rate, and is set with an alternating stimulus. The parameter of
interest is rarefaction and condensation with is enabled by pressing
(condensation (+) and rarefac-
tion (-)) prior to starting the test. Alternatively, you can enter the Temporary Setup to change the
polarity if you want to measure one curve as condensation and one curve as rarefaction.
It is recommend to use insert phones for the measurement to be able to make a clamped reference meas-
ure. The time window is set within the first few milliseconds as they are of interest.
For information about the test procedure please refer to the relevant quick guide.
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