Individual semicircular canal function in superior and XXXX .

@entity1 @entity4237 @entity393 @entity388
OBJECTIVE: To examine the concept of selective superior and @entity4237 involvement in @entity388 by studying the distribution of semicircular canal (SCC) involvement in such @entity1 . BACKGROUND: @entity388 was traditionally thought to involve the superior and @entity4237 . Recent work suggests that in some @entity1 , only the superior nerve is involved. So far there are no reported cases of selective involvement of the @entity4237 . METHODS: The authors measured the vestibuloocular reflex from individual SCC at natural head accelerations using the head impulse test. The authors studied 33 @entity1 with acute unilateral peripheral vestibulopathy, including 29 with @entity388 and 4 with simultaneous ipsilateral @entity393 , 18 healthy subjects and 15 surgical unilateral vestibular deafferented @entity1 . RESULTS: In @entity1 with preserved hearing, eight had deficits in all three SCC, suggesting @entity4237 . Twenty-one had a lateral SCC deficit or a combined lateral and anterior SCC deficit consistent with selective involvement of the superior vestibular nerve. Two @entity1 with ipsilateral @entity393 had normal caloric responses and an isolated posterior SCC deficit on impulsive testing. The authors propose that these two @entity1 had a selective loss of @entity4237 . CONCLUSION: @entity388 can affect the superior and @entity4237 together or can selectively affect the superior vestibular nerve.
