To lower the threshold for clinical application by reducing the testing time for recording vestibular-evoked myogenic potentials (VEMPs), we evaluated whether a simultaneous recording of ocular and cervical VEMPs after unilateral or bilateral stimulation can be achieved without a loss in diagnostic sensitivity.

The combined evaluation of ocular and cervical VEMPs permits the assessment of both endorgans and whole vestibular nerve function, as well as the ascending and descending vestibular pathways in the brainstem at once.

In about 30 healthy participants and 20 patients with acute unilateral vestibular neuritis, unilateral simultaneous cVEMP and oVEMP recordings in each side during monaural stimulation (air-conducted sound, 500Hz tone bursts, 100 nHL), and bilateral simultaneous recordings of each VEMP while binaural stimulation were compared to the conventional method of sequential recording each VEMPs on each side at a time.

Inclusion Criteria:

1. acute onset of vertigo
2. the appearance of mixed horizontal and torsional nystagmus
3. impaired horizontal semicircular canal (SCC) function on head-impulse test and a unilaterally absent or reduced caloric response (i.e., a caloric paresis score > 25%)
4. intact inferior division of vestibular nerve as evidenced by normal cVEMP and normal head-impulse test for vertical SCCs
5. the absence of auditory and neurologic signs

Exclusion Criteria:

• a previous history of vertigo or neuro-otologic diseases

About thirty healthy volunteers without a previous history of vertigo or neuro-otologic diseases will be enrolled in this study. The subjects were also screened with a full history on vestibular disorders, with pure tone audiogram, and head-impulse tests to exclude the possibility of previous vestibular disorders or migraine which may cause abnormal VEMPs.

The criteria for inclusion as a patient with vestibular neuritis involving the superior division (superior VN) will be included the following: (1) acute onset of vertigo, (2) the appearance of mixed horizontal and torsional nystagmus, (3) impaired horizontal semicircular canal (SCC) function on head-impulse test and a unilaterally absent or reduced caloric response (i.e., a caloric paresis score > 25%), (4) intact inferior division of vestibular nerve as evidenced by normal cVEMP and normal head-impulse test for vertical SCCs, and (5) the absence of auditory and neurologic signs.