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  • Title: [Vertigo caused by vertebrobasilar insufficiency].
    Author: Zhang SZ.
    Journal: Zhonghua Er Bi Yan Hou Ke Za Zhi; 1993; 28(3):138-41, 185-6. PubMed ID: 8217292.
    Abstract:
    This paper deals with electronystagmographic changes in 81 patients suffered from recurrent vertigo considered to be caused by vertebro-basilar insufficiency. Electro-oculogram features showed that (1) In saccadic test, the latency prolonged, the peak velocity of larger amplitude decreased; (2) When the eye smooth pursuit system was tested, Benitez III Type curves appeared in 40% of patients, simultaneously digital computer showed that the total harmonic distortion was more than 15% in 41.9% of patients; (3) the velocity ratio of fast to slow phases of the optokinetic nystagmus decreased, as a result of decrease in fast phase velocity. (4) The spontaneous and positional nystagmus occurred in 58% of patients. (5) The intensity of caloric response was weaker than that in normal subjects, canal paresis increased, failure of fixation suppression occurred in 17.7% of patients.
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