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- W2013493752 abstract "<b>Background: </b> Electrical vestibular stimulation is believed to directly activate the vestibular afferents to mediate an electrically evoked vestibulo-ocular reflex (eVOR). Gentamicin, an aminoglycoside antibiotic, induces vestibulotoxicity by hair cell damage and death. <b>Objective: </b> To determine if human eVOR is impaired by hair cell damage and death in systemic gentamicin vestibulotoxicity (GV). <b>Methods: </b> Three-dimensional binocular eye movements evoked by bilateral, bipolar, 100 msec direct current-step at intensities of 0.9, 2.5, 5.0, 7.5, and 10.0 mA were recorded with dual-search coils in 12 GV patients, and the results were compared to 13 healthy subjects. <b>Results: </b> Normal eVOR was predominantly torsional, comprising phasic eVOR initiation and cessation acceleration pulses at 9 msec latency after current onset and offset, with a tonic eVOR velocity-step during the 100 msec intervening period of maintained current. Normal phasic eVOR increased, while tonic eVOR scaled linearly, with current intensity. GV impaired phasic eVOR more severely than tonic eVOR, and prolonged the latency to 12–13 msec. In patients without mechanical response to vestibular tests, phasic eVOR was reduced to one-fifth of normal amplitude, doubled in duration, had reduced ability to vary with current intensity, and threshold was increased. Tonic eVOR was reduced to one-third of normal, but still scaled linearly with current intensity. Patients, who retained partial mechanical responses to vestibular tests, had phasic eVOR impairment without tonic eVOR abnormality. <b>Conclusion: </b> Impairment of evoked vestibulo-ocular reflex (eVOR) in gentamicin vestibulotoxicity (GV) suggests that vestibular hair cells, activated by electrical stimulation, mediate the eVOR. Abnormalities of the eVOR, especially the phasic component, might be a marker of vestibular injury in GV. <b>GLOSSARY: </b><b>eVOR</b> = electrically evoked vestibulo-ocular reflex; <b>EVS</b> = electrical (galvanic) vestibular stimulation; <b>GV</b> = gentamicin vestibulotoxicity." @default.
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- W2013493752 date "2008-11-24" @default.
- W2013493752 modified "2023-10-17" @default.
- W2013493752 title "Gentamicin vestibulotoxicity impairs human electrically evoked vestibulo-ocular reflex" @default.
- W2013493752 doi "https://doi.org/10.1212/01.wnl.0000335971.43443.d9" @default.
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