The click-evoked vestibulo-ocular reflex in superior semicircular canal dehiscence.
The authors studied eye movement responses to loud (110dB) clicks in 4 patients with Tullio effect due to superior semicircular canal dehiscence and in 9 normal subjects, by averaging the electro-oculogram. All 4 patients had small (0.1-0.3 deg) but easily reproducible vertical vestibulo-ocular reflex eye movement responses to the clicks. Normal subjects had responses that were at least 10 times smaller. The click-evoked vestibulo-ocular reflex test is a simple, robust way to screen dizzy patients for symptomatic superior semicircular dehiscence.
Halmagyi
G M
GM
Neurology Department, Royal Prince Alfred Hospital, Sydney, Australia. michael@icn.usyd.edu.au
McGarvie
L A
LA
Aw
S T
ST
Yavor
R A
RA
Todd
M J
MJ
D000161:Acoustic Stimulation; D000368:Aged; D004244:Dizziness / Q000209:etiology; D004585:Electrooculography; D005133:Eye Movements; D006801:Humans; D012001:Hyperacusis / Q000209:etiology; D007759:Labyrinth Diseases / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009759:Nystagmus, Pathologic / Q000209:etiology; D011237:Predictive Value of Tests; D011930:Reaction Time; D012016:Reference Values; D012027:Reflex, Vestibulo-Ocular / Q000502:physiology; D012665:Semicircular Canals / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014057:Tomography, X-Ray Computed