Evoked potential testing in neuro-otology.

Area of Science:

• Neuroscience
• Otolaryngology
• Audiology

Background:

• Evoked potential techniques are crucial for evaluating the auditory and vestibular systems.
• Neuro-otological disorders often require specialized diagnostic tools to assess vestibular function.

Purpose of the Study:

• To review clinically relevant and emerging evoked potential techniques used in neuro-otology.
• To highlight the application of these techniques in assessing otolith organ function.

Main Methods:

• Recording cervical vestibular evoked myogenic potentials (cVEMP) from sternocleidomastoid muscles using various stimuli (air-conducted sound, bone-conducted vibration, direct current).
• Recording ocular vestibular evoked myogenic potentials (oVEMP) from extra-ocular muscles using sound or vibration stimuli.
• Exploring novel techniques like masseter and scalp electrode recordings.

Main Results:

• cVEMP and oVEMP effectively assess otolith function and are sensitive for superior canal dehiscence syndrome.
• Established patterns of cVEMP changes in peripheral and central vestibulopathies are known.
• Newer techniques using masseter muscles and scalp electrodes are under investigation.

Conclusions:

• Vestibular evoked potentials can be reliably recorded from cervical and extra-ocular muscles.
• These potentials offer a valuable assessment of otolith organs.
• They complement semicircular canal function tests and are practical for clinical neurology and otology practices.