Ipsilesional Nystagmus Induced by Vibration in Subjects With Ménière's Disease or Vestibular Schwannoma

Objective: To analyze the frequency in which vibration-induced nystagmus (VIN) with ipsilesional direction appears in subjects with Ménière's disease (MD) or vestibular schwannoma (VS). Study Design: Cross-sectional study. Setting: Tertiary referral center. Patients: Fifty-two subjects with MD and 21 subjects with vestibular schwannoma. Intervention: Videonystagmographic recordings of VIN at 30, 60, and 100 Hz. Main Outcome Measures: Direction and slow phase velocity of VIN at 30, 60, and 100 Hz. Results: Ipsilesional Nystagmus was observed in 8 of 52 subjects with MD (15.4%) and in 11 of 21 subjects affected of unilateral VS (52.4%). Ipsilesional nystagmus was significantly higher in patients with VS (p = 0.003). The frequency of appearance of ipsilesional nystagmus in the subjects with VS who has not been treated was significantly higher than those who underwent radiosurgery (84.6% vs 0%, p = 0.046). Conclusion: Ipsilesional vibration-induced Nystagmus can be present in subjects with vestibular deficits caused by MD and VS.

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