User guide
ELI
O
S
ECH001XN111-A4 – 07/2022
27
Introduction and test setup
3.3 VEMP
3.3
VEMP
Otholithic Evoked Potentials (OEP) or Myogenic Vestibular Evoked Potentials the (VEMP) are sacculo-collique reflex rec-
orded in response to an acoustic stimulation. They study the sacculo –spinal way: the sacculo, the inferior vestibular nerve to
the sterno-cleido-mastoid (SCM) ipsilateral via the cervical spinal cord. The PEO or VEMP, are recently used in the battery
of cochlea-vestibular explorations tests and reinforce the aid diagnostic in addition to others tests such as the audiogram and
Auditory Brainstern Response (ABR).
Sounds stimulations of high intensity (90 to 100 dB) activate primary vestibular neurons innervating the saccule and second-
ary vestibular neurons lower of nuclei and side vestibular.
In practice short sounds clicks (100 µs) or shorts Tone Bursts from 90 to 100dB are unilaterally issued by using an acoustic
stimulator at 1 kHz or 500 Hz frequency (Tone-Burst).
The OEP are collected at the two SCM muscles through skin electrodes placed at the 1/3 superior part of these two muscles.
During the recording, patients are placed lying supine with a head position elevated to increase their heads so that their SCM
muscles are in contraction. It is sometimes useful to turn the head of the side opposite the stimulation to increase muscle
contraction. Indeed it’s necessary because the evoked potentials amplitude is correlated with the SCM muscle contraction.
The VEMP are then amplified, filtered and averaged on 500 stimulations. The saccule being innervated by the inferior ves-
tibular nerve, such as the posterior CCS, the results are complementary to those obtained by using the caloric tests, which in
testing the external canal; evaluate the function of the higher vestibular nerve. This test assesses the functioning of saccule
receptors and sacculo-spinal channels.
3.3.1
Equipment
To make VEMP
measurement (c
VEMP and oVEMP)
, you will need the following equipment:
Common elements for all configurations
ELI
O
S
unit
E
CHO
-
DIF
unit
Electrophysiologic
cable
4 surface electrode
Measurement with insert earphone
Insert earphone
2 foam ear tips ER3-14A 13mm
or
2 foam ear tips ER3-14B 10mm
Содержание ECHODIA ELIOS
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