Blanco, M.; Monopoli-Roca, C.; �lvarez de Linera-Alperi, M.; Men�ndez Fern�ndez-Miranda, P.; Molina, B.; Batuecas-Caletr�o, A.; P�rez-Fern�ndez, N. Visual Fixation of Skull-Vibration-Induced Nystagmus in Patients with Peripheral Vestibulopathy. Audiol. Res.2024, 14, 562-571.
Blanco, M.; Monopoli-Roca, C.; �lvarez de Linera-Alperi, M.; Men�ndez Fern�ndez-Miranda, P.; Molina, B.; Batuecas-Caletr�o, A.; P�rez-Fern�ndez, N. Visual Fixation of Skull-Vibration-Induced Nystagmus in Patients with Peripheral Vestibulopathy. Audiol. Res. 2024, 14, 562-571.
Blanco, M.; Monopoli-Roca, C.; �lvarez de Linera-Alperi, M.; Men�ndez Fern�ndez-Miranda, P.; Molina, B.; Batuecas-Caletr�o, A.; P�rez-Fern�ndez, N. Visual Fixation of Skull-Vibration-Induced Nystagmus in Patients with Peripheral Vestibulopathy. Audiol. Res.2024, 14, 562-571.
Blanco, M.; Monopoli-Roca, C.; �lvarez de Linera-Alperi, M.; Men�ndez Fern�ndez-Miranda, P.; Molina, B.; Batuecas-Caletr�o, A.; P�rez-Fern�ndez, N. Visual Fixation of Skull-Vibration-Induced Nystagmus in Patients with Peripheral Vestibulopathy. Audiol. Res. 2024, 14, 562-571.
Abstract
Nystagmus induced by applying an intense vibratory stimulus to the skull (SVIN) indicates vestibular functional asymmetry. In unilateral vestibular loss, a 100-Hz bone-conducted vibration given to either mastoid immediately causes a primarily horizontal nystagmus. Test is performed in darkness to avoid visual fixation (VF) but there is no data about how much VF affects the often-intense SVIN. The aim is to analyze the amount of reduction of SVIN when VF is allowed during testing. Thus, all patients seen in a tertiary hospital for vertigo or dizziness with positive SVIN were included. SVIN was recorded for 10 seconds for each condition: without VF (aSVINwo) and VF (aSVINw). We obtained an aSVINwo and aSVINw as average slow-phase velocities (SPV) without and with VF. VF index (FISVIN) was calculated as the ratio of SPV. Among the 124 patients included, spontaneous nystagmus (SN) was found in 25% and the mSPV (without VF) of SN was 2.62.4�/s. Mean FISVIN was 0.270.29. FISVIN was 0 in 42 patients and >0 FISVIN <1 in 82 (mean FISVIN 0.390.02). Fixation suppression was found in all patients with SVIN in cases of peripheral vestibulopathy. FISVIN clearly delineates two populations of patients: with or without complete visual reduction of nystagmus.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.