Hypothesis The knowledge of vibration-induced nystagmus test (SVINT) values in the normal population is highly relevant to provide a rapid orientation on the diagnosis attitude in a patient with vertigo. Background Although mastoid bone vibration should only induce nystagmus in the presence of vestibular asymmetry, it has also been reported in normal individuals raising doubts as to how to interpret the SVINT. To date, no population studies involving the use of the SVINT and that establish normative values have been published. Methods This study was carried out at two tertiary healthcare centres on a total of 122 subjects. We stimulated at three fre- quencies (30, 60 and 100 Hz), in increasing order, first stimulating the right mastoid and then the left mastoid, and waiting for 30 s between each stimulus. The response was recorded with a videonystagmography system. The following variables were evaluated in each subject: the mean and maximum speed of the slow phase of nystagmus, the frequency of the nystagmatic response (NR) and the component and direction of the rapid phase of nystagmus. Results Only 26 subjects (20.5%) of the subjects studied here (122 subjects) developed any kind of nystagmatic response and 96 subjects (79.5%) did not display any
European Archives of Oto-Rhino-Laryngology – Springer Journals
Published: Jun 1, 2018
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