Vertical component of caloric nystagmus in cases with servere canal paresis (CP).

概要

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In 7 of 54 patients who showed lack of holizontal caloric nystagmus with cold stimulation with the eyes closed on electronystagmography, upbeat nystagmus was recorded and became downbeat in 4 patients when their head position was changed. The severe CP of the 7 patients was considerd to be caused by lesions of the inner ear or peripheral vestibular nerve since they showed normal findings on OKN, ETT and cranial nerve testing. This upbeat caloric nystagmus seems to originate from the cold caloric stimulation of the anterior canal in patients with a lateral canal lesion, who don't show the perverted nystagmus which is believed to indicate a lesion of the vestibular nucleus.<BR>In conclusion, the vertical component of caloric nystagmus, which is nearly always upbeat with cold stimulation, appears to point to a partial lesion of the inner ear or peripheral vestibular nerve.
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