VEMP — Vestibular Evoked Myogenic Potential
Objective vestibular test evaluating the saccule (cVEMP from SCM) and utricle (oVEMP from inferior oblique) separately; SSCD shows elevated amplitude, Menière shows reduced amplitude.
When VEMP — Vestibular Evoked Myogenic Potential is handled within otology and ear disease, definition, risk and function are considered together. Objective vestibular test evaluating the saccule (cVEMP from SCM) and utricle (oVEMP from inferior oblique) separately; SSCD shows elevated amplitude, Menière shows reduced amplitude. Patient expectation, pace of change, previous treatment and effect on daily performance determine the value of assessment. the dictionary entry assessment interprets hearing level, this topic ear pressure, this term discharge history, the finding dizziness pattern and this entry daily communication impact together. The aim is to explain the clinical point generally while leaving personal decisions to clinical review. The first message for the dictionary entry is that the finding becomes meaningful through history, examination and selected tests: VEMP examines two separate reflex pathways: cervical VEMP (cVEMP) records the inhibitory response of the saccule to acoustic stimuli from the sternocleidomastoid muscle and evaluates inferior vestibular nerve and saccule function; ocular VEMP (oVEMP) measures the utricle and superior vestibular nerve by recording from the contralateral inferior oblique muscle. This keeps online information from replacing personal diagnosis.
Assessment of this topic separates the story into timing, side, severity and triggers before conclusions are made. the finding examination looks for findings that confirm or change that story. this entry review may gather otoscopy, the clinical point microscopic examination, the dictionary entry audiometry-tympanometry and this topic temporal bone imaging inside the this term file. the finding interpretation separates hearing type, this entry eardrum mobility, the clinical point ossicular chain status, the dictionary entry vestibular findings and this entry prior infection history. When the clinical point is assessed, the short definition, patient wording and objective findings are read together: In superior semicircular canal dehiscence (SSCD), cVEMP amplitude markedly increases and threshold drops — this is a strong diagnostic sign. Higher-risk possibilities are considered first, then the next clinical step is chosen. Testing is selected only when it can change diagnosis or treatment planning.
Care planning for the dictionary entry depends on the balance between diagnostic certainty and realistic patient benefit. Mild stable findings are discussed with a lower-urgency frame, while progressive or structural problems receive closer attention. this topic planning discusses medication or drops, this term hearing aids, the finding vestibular rehabilitation, this entry tympanoplasty-stapes surgery or the clinical point implant options by finding. Before a care path is chosen for the dictionary entry, expected benefit, alternatives, recovery, possible complications and the later review plan are discussed in the same visit. The plan is kept open to follow-up reassessment.
Good monitoring after this topic shows whether patient-perceived change matches objective findings. the clinical point follow-up tracks hearing change, the dictionary entry ear discharge, this topic dizziness, this term tinnitus burden and the finding quality-of-life impact together. Patient counselling for this entry aims to prepare the right questions without replacing personal diagnosis with online information, recognize safety signals and decide with examination findings. Warning signs such as the clinical point follow-up with rapidly reduced hearing, weak facial movement or severe dizziness are recorded as reasons to discuss the recovery course again.
Reading about the dictionary entry is preparation rather than a personal care decision; the visit is more useful when older reports, images, operation notes and the main expectation are organized beforehand.
In this guide
Interpreting VEMP Testing
In cVEMP, p13-n23 waves are evaluated; amplitude, threshold and latency are measured. If the right-left amplitude asymmetry ratio exceeds 50%, it is considered pathological. Normal cVEMP threshold is generally between 80-95 dBHL; in SSCD this threshold may fall below 60 dBHL.
In oVEMP, the n10 wave (latency ~10 ms) is evaluated; it is an indicator of the utricle and superior vestibular nerve. Contralateral oVEMP amplitude asymmetry between right and left helps localise upper vestibular nerve lesions. VEMP results should always be interpreted together with the clinical picture, vHIT and VNG.
Clinical Applications of VEMP
VEMP has value in diagnosing Menière's disease and monitoring treatment response — particularly after intratympanic steroid. In SSCD diagnosis, high amplitude cVEMP is a primary diagnostic criterion together with CT. The combination of oVEMP and cVEMP is helpful in differentiating whether acoustic neuroma affects the superior or inferior vestibular nerve.
In chronic balance problems associated with otolith dysfunction, VEMP establishes a baseline and contributes to rehabilitation planning. It is also used to determine which nerve branch (upper or lower) is affected in vestibular neuritis.
VEMP Reliability
VEMP results are muscle tone dependent; adequate activation of the sternocleidomastoid muscle must be ensured during cVEMP. Amplitude decreases with age; age-specific norms should therefore be used. cVEMP is affected by conductive hearing loss; however this problem can be overcome with bone-conducted stimulation.
oVEMP is a small-amplitude response and requires more care. Bilateral absence of VEMP should be interpreted in the context of ototoxicity, advanced Menière's or neurological disease. VEMP alone cannot diagnose; a battery approach is preferred.
When Should VEMP Be Done?
VEMP is recommended in suspected or diagnosed Menière's disease to evaluate hearing and vestibular function together. In suspected SSCD — particularly when autophony, Tullio phenomenon or conductive hearing loss is present — cVEMP should be evaluated together with CT.
VEMP is added to the battery to more precisely localise the unilateral loss pathology attributable to vestibular neuritis. It also features as a complementary test in ototoxic drug monitoring and auditory neuropathy spectrum disorder evaluation.
Frequently asked questions
What is VEMP — Vestibular Evoked Myogenic Potential?
When is VEMP — Vestibular Evoked Myogenic Potential clinically important?
When is ENT assessment relevant for VEMP — Vestibular Evoked Myogenic Potential?
What information helps assessment of VEMP — Vestibular Evoked Myogenic Potential?
Learn more about this procedure
Detailed guide from Prof. Dr. Özdoğan's clinic
Related terms
References
- AAO-HNSFClinical Practice Guideline: Sudden Hearing Loss (Update)
- AAO-HNSFClinical Practice Guideline: Benign Paroxysmal Positional Vertigo (Update)
- AAO-HNSFClinical Practice Guideline: Meniere's Disease
- NCBI BookshelfAcute Otitis Media
- NCBI BookshelfTympanoplasty
This glossary entry is for informational purposes only and does not constitute medical advice. Consult a qualified specialist for diagnosis and treatment.