Tonic neck stimulation and caloric nystagmus.

概要

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The cervico-vestibular interaction was investigated in 20 patients with unilateral labyrinthine dysfunction and 16 normal subjects using tonic stimulation of the neck and caloric stimulation. Caloric nystagmus was modulated by tonic neck stimution in the patients with unilateral labyrinthine dysfunction. Tonic stimulation of the neck enhanced caloric nystagmus induced by stimulation of the diseased ear and suppressed nystagmus induced by stimulation of the normol ear in these patients. However, this modulation was not observed in the normal subjects. These results were the same as in the previous investigation using neck vibration, suggesting that input from the neck proprioceptors is quite important in controlling eye movements in patients with unilateral labyrinthine dysfunction, and that in these patients the sensory input modulation from the neck proprioceptors may induce decompensation, even though compensation occurs following unilateral labyrinthine dysfunction. Moreover, in the patients with unilateral labyrinthine dysfuntion, the vestibulo-ocular reflex may be influenced by normal movements such as ventriflexion or torsion and decompensation may be induced by those movements.
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