Eclipse Additional Information Page 103
5 VEMP
5.1 About the VEMP module
The Eclipse with VEMP (Vestibular Evoked Myogenic Potential) is intended for vestibular evoked myogenic
potential testing to assist in the assessment of vestibular function. The target population for Eclipse VEMP
includes all ages.
The VEMP (Vestibular Evoked Myogenic Potential) module includes two different tests in the EP module;
cVEMP and oVEMP. The VEMP tests are used for subjective waveform evaluation of the saccule and utricle
and their afferent pathways (part of the balance organ). This is a supplement to a traditional VNG examina-
tion, as traditional VNG only evaluates the function of the semicircular canals, not the saccule and/or the utri-
cle. Our ability to evaluate the saccule and utricle and their afferent pathways with the cVEMP and oVEMP
test is due to their proximity to the stapes. When high intensity stimuli of 85dBnHL or greater are presented
to the ear, the mechanical energy transmitted into the cochlea via the stapes may also stimulate the end or-
gan of the saccule and utricle and evoke a myogenic potential that can be recorded from the sternocleido-
mastoid (SCM) muscle and the inferior oblique muscle respectively. Optimum cVEMP results are obtained
when the patient is contracting one of the SCM muscles during stimulation since the response recorded is
inhibitory. oVEMP results are obtained when the patient holds an upward gaze during stimuluation.
The cVEMP and oVEMP responses are demonstrated by reproducible wave deflections with known ex-
pected latencies. VEMP morphologies and latencies are stimulus and patient dependent just like ABR re-
cordings, but are not affected by the degree of sensorineural hearing loss.
A middle ear issue, such as fluid, effusion or otosclerosis results in conductive hearing loss and reduces the
VEMP stimulus energy reaching the vestibular organs; the saccule and utricle. Prior to a VEMP test an ear
inspection and tympanometry should be carried out to rule out middle ear issues.
The VEMP module contains the following default protocols:
cVEMP 500Hz TB
oVEMP 500Hz TB
5.2 The VEMP Menu Items
The VEMP module is a part of the EP15/25 module and contains the same functionalities of the menu items
as the EP 15/25. Please refer to the EP15/25 section of and explanation of the general menu items for
EP15/25. In addition to the general functions, the VEMP module contains additional functions described
here.
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