Galvanic-induced postural movements as a test of vestibular function in humans

The Laryngoscope
S P CassJ J DiPasquale

Abstract

Galvanic stimulation produces a postural sway and eye movements in humans. Since galvanic currents are thought to exert their effect at the trigger zone of the vestibular nerve, an intact vestibular nerve should be necessary to produce a response. We have used galvanic stimulation in humans to test the hypothesis that intact vestibular nerve fibers are required to obtain a postural away response. Experimental subjects included normal subjects, patients who had undergone resection of an acoustic neuroma, and patients who had undergone vestibular neurectomy and surgical labyrinthectomy. Our results support the hypothesis that an intact vestibular nerve is necessary to produce a response. Moreover, two patients with recurrent vertigo following vestibular neurectomy and labyrinthectomy, who had absent ice-water caloric test responses in the operated ears, were found to have a positive galvanic response. This result suggested that their recurrent vertigo was based on intact residual vestibular nerve fibers. Although previous research has not yielded a routine clinical use for galvanic stimulation, our results suggest that galvanic stimulation of the vestibular system can provide unique and valuable diagnostic information.

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Citations

Feb 24, 1998·The Laryngoscope·M L BanceR T Ramsden
Jun 11, 2011·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Benjamin VailleauCatherine de Waele
May 15, 2004·Acta Oto-laryngologica·Susan G T BalterHerman Kingma
Oct 22, 2009·International Journal of Audiology·J NeuburgerA Büchner
Jun 8, 1999·The Journal of Physiology·R C FitzpatrickJ L Taylor
Apr 25, 2000·Acta Oto-laryngologica·F N ArdicM S Redfern

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