[Vertigo caused by vertebrobasilar insufficiency].
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.
Zhang
S Z
SZ
PLA General Hospital, Beijing.
D000328:Adult; D000368:Aged; D003080:Cold Temperature; D004584:Electronystagmography; D005260:Female; D006358:Hot Temperature; D006801:Humans; D008297:Male; D008875:Middle Aged; D012438:Saccades; D014715:Vertebrobasilar Insufficiency / Q000150:complications* / Q000503:physiopathology; D014717:Vertigo / Q000209:etiology* / Q000503:physiopathology