About Nystagmus Transformation in a Case of Apogeotropic Lateral Semicircular Canal Benign Paroxysmal Positional Vertigo
Joint Authors
Source
International Journal of Otolaryngology
Issue
Vol. 2011, Issue 2011 (31 Dec. 2011), pp.1-4, 4 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2011-07-26
Country of Publication
Egypt
No. of Pages
4
Main Subjects
Abstract EN
There are two forms of lateral semicircular canal benign paroxysmal positional vertigo: geotropic and apogeotropic.
When the pathophysiological mechanism of the apogeotropic form is that of canalolithiasis, we can observe a transformation from an apogeotropic nystagmus into a geotropic one.
Usually, this phenomenon happens simultaneously on both sides, thus enabling us to observe a right-beating paroxysmal positional nystagmus when the patient lies on the right side and a left-beating paroxysmal positional nystagmus on the left side.
We describe a case in which the transformation occurred gradually, so that, after three head rotations from side to side in supine position, there was a right nystagmus beating toward the ground (geotropic) with the patient on the right side and a right nystagmus beating away from the ground (apogeotropic) on the left side.
However, after further rotations we observed the nystagmus transformation also on the left side, with a geotropic nystagmus on both sides.
The phenomenon of gradual transformation could happen because initially only a part of the debris moved from the anterior to the posterior aspect of the canal during head rotations.
American Psychological Association (APA)
Vannucchi, Paolo& Pecci, Rudi. 2011. About Nystagmus Transformation in a Case of Apogeotropic Lateral Semicircular Canal Benign Paroxysmal Positional Vertigo. International Journal of Otolaryngology،Vol. 2011, no. 2011, pp.1-4.
https://search.emarefa.net/detail/BIM-490679
Modern Language Association (MLA)
Vannucchi, Paolo& Pecci, Rudi. About Nystagmus Transformation in a Case of Apogeotropic Lateral Semicircular Canal Benign Paroxysmal Positional Vertigo. International Journal of Otolaryngology No. 2011 (2011), pp.1-4.
https://search.emarefa.net/detail/BIM-490679
American Medical Association (AMA)
Vannucchi, Paolo& Pecci, Rudi. About Nystagmus Transformation in a Case of Apogeotropic Lateral Semicircular Canal Benign Paroxysmal Positional Vertigo. International Journal of Otolaryngology. 2011. Vol. 2011, no. 2011, pp.1-4.
https://search.emarefa.net/detail/BIM-490679
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-490679