Posterior semicircular canal nystagmus is conjugate and its axis is parallel to that of the canal.

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

Neurology

journal_title

Neurology

authors

Cremer PD,Migliaccio AA,Pohl DV,Curthoys IS,Davies L,Yavor RA,Halmagyi GM

doi

10.1212/wnl.54.10.2016

subject

Has Abstract

pub_date

2000-05-23 00:00:00

pages

2016-20

issue

10

eissn

0028-3878

issn

1526-632X

journal_volume

54

pub_type

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