Eclipse Additional Information Page 71
3.13 Neuro Latency Examination
If there is a tumour affecting the hearing nerve, the transmission time is prolonged. Since the transmission
time is fairly stable between individuals of the same age group, it is common to compare the latency of the
response against a set of ABR normative data. This will reveal if the patient has normal nerve transmission
times or should be referred for more extensive testing due to the presence of transmission times longer than
expected. There will, of course, be some variance between individuals when determining normative latency
times. A common test is to compare left ear’s latency times to right ear’s latency times, as they should match
very accurately. When doing this comparison, remember that a unilateral hearing loss may also cause a
longer latency time at the impaired side. This is because the stimulus is perceived with lower effective inten-
sity and lower intensity by itself causes a longer latency.
3.13.1 Protocol Settings for Neuro Latency Examination
The Latency protocol is used for comparison of the latencies between left and right ear.
The Latency protocol is using a slower rate (slower rates can also be used) – and high intensity stimuli. This
should provide clear identifiable waves peaks.
For information about the test procedure please refer to the relevant quick guide.
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