Abnormal Cervical Vestibular-Evoked Myogenic Potentials Predict Evolution of Isolated Recurrent Vertigo into Meniere's Disease.

INTRODUCTION: Vestibular-evoked myogenic potentials (VEMPs) can be abnormal in patients with idiopathic recurrent spontaneous vertigo. We aimed to determine whether abnormal cervical vestibular-evoked myogenic potentials (cVEMPs) can predict evolution of isolated recurrent vertigo into Meniere's disease (MD).

METHODS: We had followed up 146 patients with isolated recurrent vertigo and an evaluation of cVEMPs for 0-142 months [median = 6, interquartile range (IQR) = 0-29] at the Dizziness Clinic of Seoul National University Bundang Hospital from June 2003 to May 2014. We defined the variables associated with a progression into MD and calculated cumulative progression rates.

RESULTS: Among the 94 patients with recurrent vertigo and abnormal cVEMPs, 18 (18/94, 19%) showed an evolution into MD while only 2 of the 50 (4%) patients with normal cVEMPs evolved into MD during the follow-up (p = 0.01). The interval between onset of vertigo and development of cochlear symptoms ranged from 1 month to 13.6 years (median = 3 years, IQR = 0.5-4.5 years). Overall, pure tone audiometry (PTA) threshold at 0.25 kHz [hazard ratio (HR) = 1.1, 95% confidence interval (CI) = 1.0-1.2] and abnormalities of cVEMPs (HR = 5.6, 95% CI = 1.3-25.5) were found to be significantly associated with a later conversion into MD. The cumulative progression rate was 12% (95% CI = 5-18) at 1 year, 18% (8-26) at 2 years, and 22% (11-32) at 3 years.

CONCLUSION: Abnormal cVEMPs may be an indicator for evolution of isolated recurrent vertigo into MD. Patients with isolated recurrent vertigo may be better managed conforming to MD when cVEMPs are abnormal.