D-0120578-C – 2019/11
Eclipse – Instructions for Use - US
Page 53
3.11 Making a AMLR recording
AMLR can be used to help determine the degree of hearing loss in adult populations.
But the most common neurological use of the AMLR are for the assessment of the functional integrity of the
auditory pathway above the level of the brainstem in cases with suspected lesions and for the assessment of
nonorganic hearing loss.
Young children and infants may not present AMLR even when their auditory and neurological functions are
intact, because of their higher sensitivity to stimulus rate. In general AMLR from children younger than 10
years should be interpreted with caution.
The stimuli used for AMLR is similar to the traditional ABR octave wide stimuli.
3.11.1 Example of electrode montage AMLR
RED Right mastoid or ear lobe (reference or inverting)
BLUE Left mastoid or earlobe (reference or inverting)
WHITE True CZ or vertex/high forehead (active or non inverting)
BLACK Ground at cheek or low forehead - distance of few cm to WHITE electrode must be observed.
The patient is instructed to asked to relax or sleeping during test.
During sedation e.g. with chloral hydrate as with natural sleep the ALMR response is not affected.
The AMLR latency ranges from 5-50 ms and amplitude sizes ranges from 0-2uV.
3.11.2 Available AMLR stimuli
• CE-Chirp
®
and CE-Chirp
®
LS
• NB CE-Chirp
®
and NB CE-Chirp
®
LS 500Hz, 1kHz, 2kHz and 4kHz
• Tone bursts 250Hz – 4kHz
• Click
• Custom WAV file (when Research Module license is enabled)
For neuro diagnosis a moderate stimuli Intensity below 70dB nHL is appropriate.
For estimation of threshold response amplitude follows the stimuli level as for traditional ABR threshold
testing.
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