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Postural responses to low-intensity, short-duration, galvanic vestibular stimulation as a possible differential diagnostic procedure.

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Title: Postural responses to low-intensity, short-duration, galvanic vestibular stimulation as a possible differential diagnostic procedure.
Authors: Rinalduzzi, S., Cipriani, A. M., Capozza, M., Accornero, N.
Source: Acta Neurologica Scandinavica. Feb2011, Vol. 123 Issue 2, p111-116. 6p.
Subjects: Vestibular stimulation, Cell polarity, Neuropathy, Temporal bone diseases, Synapses, Hair cells, American Academy of Neurology, Differential diagnosis
Abstract: Rinalduzzi S, Cipriani AM, Capozza M, Accornero N. Postural responses to low-intensity, short-duration, galvanic vestibular stimulation as a possible differential diagnostic procedure. Acta Neurol Scand: 2011: 123: 111-116. © 2010 The Authors Journal compilation © 2010 Blackwell Munksgaard. In this study we investigated the effect of polarity-related differences in short-duration very low-intensity galvanic vestibular stimulation (GVS), not perceived by the subject, by evaluating the minimal postural sway responses in healthy people. We also verified its possible usefulness as a differential diagnostic tool in patients with postural instability disturbances related to polyneuropathy or peripheral vertigo. We applied bimastoid opposite polarity direct current GVS (0.7 mA for 1 s) and recorded the induced postural response with an electromagnetic head position tracker. Latency, amplitude, velocity and an asymmetry index were measured between two reverse polarity sessions. The postural response was easily recorded and was statistically wider in amplitude and velocity in the polyneuropathy group than in the other groups. Postural responses were asymmetric only in the group with mild peripheral vertigo. These findings suggest that even weak GVS affects vestibular excitability: cathodal polarization increases whereas anodal GVS decreases excitability. Symmetry and amplitude or velocity of the postural responses, particularly in the eyes closed condition, can differentiate the three groups of subjects tested. [ABSTRACT FROM AUTHOR]
Copyright of Acta Neurologica Scandinavica is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Rinalduzzi S, Cipriani AM, Capozza M, Accornero N. Postural responses to low-intensity, short-duration, galvanic vestibular stimulation as a possible differential diagnostic procedure. Acta Neurol Scand: 2011: 123: 111-116. © 2010 The Authors Journal compilation © 2010 Blackwell Munksgaard. In this study we investigated the effect of polarity-related differences in short-duration very low-intensity galvanic vestibular stimulation (GVS), not perceived by the subject, by evaluating the minimal postural sway responses in healthy people. We also verified its possible usefulness as a differential diagnostic tool in patients with postural instability disturbances related to polyneuropathy or peripheral vertigo. We applied bimastoid opposite polarity direct current GVS (0.7 mA for 1 s) and recorded the induced postural response with an electromagnetic head position tracker. Latency, amplitude, velocity and an asymmetry index were measured between two reverse polarity sessions. The postural response was easily recorded and was statistically wider in amplitude and velocity in the polyneuropathy group than in the other groups. Postural responses were asymmetric only in the group with mild peripheral vertigo. These findings suggest that even weak GVS affects vestibular excitability: cathodal polarization increases whereas anodal GVS decreases excitability. Symmetry and amplitude or velocity of the postural responses, particularly in the eyes closed condition, can differentiate the three groups of subjects tested. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Acta Neurologica Scandinavica is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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