Clinical Findings of Galvanic Body Sway Test in Patients with Bilateral Vestibular Disorders

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Previously we reported that the Galvanic Body Sway Test (GBST) was a very useful method to differentiate between inner ear disorders and retro-labyrinthine lesions causing vestibular dysfunction. This paper describes clinical findings in patients with bilateral vestibular disorders.GBST was used in 26 patients with vertigo or disequilibrium and a bilateral depressed response to the caloric test. Eleven patients had peripheral lesions (inner ear or vestibular nerve), 9 had central lesions and 6 had combined or unknown lesions. Abnormal GBST responses were found in 13 cases (50%), a significantly higher percentage than in patients with unilateral dysfunction on the caloric test. Eight of the 9 patients with central disorders had abnormal GBST responses, but only 2 with peripheral lesions had abnormal GBST responses and these 2 patients had a very long duration of their disease. It has been considered that a depressed response in the caloric test indicates an inner ear disorder, but, as the above results show, retro-labyrinthine lesions were present in not a few patients with bilateral vestibular disorders. One should therefore take into consideration the possible presence of retro-labyrinthine lesions in the diagnosis of bilateral vestibular disorders.
耳鼻咽喉科臨床学会の論文