Abstract:
:A patient with a postoperative fistula of the left posterior semicircular canal is presented. Negative pressure in the external ear canal produced upbeat-torsional nystagmus, which was recorded in three dimensions using binocular scleral search coils. The nystagmus was conjugate, without skew deviation, and its trajectory corresponded to the anatomic axis of the left posterior canal. The current study helps validate Ewald's first law in humans: the axis of nystagmus should match the anatomic axis of the semicircular canal that generated it. This law is clinically useful in diagnosing pathology of the vestibular end-organ, such as benign paroxysmal positional vertigo or the superior semicircular canal dehiscence syndrome.
journal_name
Neurologyjournal_title
Neurologyauthors
Cremer PD,Migliaccio AA,Pohl DV,Curthoys IS,Davies L,Yavor RA,Halmagyi GMdoi
10.1212/wnl.54.10.2016subject
Has Abstractpub_date
2000-05-23 00:00:00pages
2016-20issue
10eissn
0028-3878issn
1526-632Xjournal_volume
54pub_type
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