Prevalence of Abnormal Cervical Vestibular Evoked Myogenic Potential (CVEMP) Responses in Dizzy Patients Following Mild Traumatic Brain Injury

 

Abstract

Objective: We sought to assess the feasibility of cervical vestibular evoked myogenic potential (cVEMP) as a diagnostic tool for patients experiencing dizziness after mild traumatic brain injury (mTBI) in tertiary neurotology clinic. We used cVEMP to estimate the prevalence of saccular dysfunction after mTBI.

Design: This was a cross-sectional study of patients referred to a tertiary neurotology clinic for dizziness after mTBI. These patients were given a standard neurotology clinical examination and vestibular assessment in addition to a cVEMP test.

Results: 20 of 63 (31.7%) patients had an abnormal cVEMP response. 75% of these subjects showed no deficiency by clinical exam or VNG and 50% registered a deficiency by pure tone audiometry (PTA).

Conclusions: We found that abnormal cVEMP responses were common in dizzy patients post-mTBI and many had normal results in standard neurotological/vestibular tests. cVEMP may help identify those with vestibular dysfunction associated with saccular injury after mTBI.

Keywords: Vestibular evoked myogenic potential; TBI; cVEMP, saccule

Abbreviations: TBI: Traumatic Brain Injury; VEMP: Vestibular Evoked Myogenic Potential; SCM: Sternocleidomastoid; PTA: Pure Tone Audiometry; IAD: Interaural Amplitude Difference; PPPD: Persistent Postural Positional Dizziness

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