Horizontal semicircular canal jam: Two new cases and possible mechanisms.
Journal
Laryngoscope investigative otolaryngology
ISSN: 2378-8038
Titre abrégé: Laryngoscope Investig Otolaryngol
Pays: United States
ID NLM: 101684963
Informations de publication
Date de publication:
Feb 2020
Feb 2020
Historique:
received:
04
10
2019
revised:
15
11
2019
accepted:
24
12
2019
entrez:
5
3
2020
pubmed:
5
3
2020
medline:
5
3
2020
Statut:
epublish
Résumé
Benign paroxysmal positional vertigo (BPPV) of the horizontal semicircular canal (hSCC) can present with otoconia blocking its lumen (canalith jam), with signs and symptoms that make it difficult to distinguish from central nervous system pathology. Here we report two cases of canalith jam affecting the hSCC and offer a theoretical mechanism based on known vestibular neurophysiology. We use video-oculography to document the canalith jam and show the moment the otoconia loosen. Canalith jam is a rare form of BPPV remedied with repositioning maneuvers. Clinicians should consider canalith jam as a mechanism for BPPV when the nystagmus is (a) Direction fixed with fixation removed and during positional testing; (b) Velocity dependent on supine head position; (c) Converts to geotropic directional changing nystagmus.
Identifiants
pubmed: 32128444
doi: 10.1002/lio2.352
pii: LIO2352
pmc: PMC7042637
doi:
Types de publication
Journal Article
Langues
eng
Pagination
163-167Informations de copyright
© 2020 The Authors. Laryngoscope Investigative Otolaryngology published by Wiley Periodicals, Inc. on behalf of The Triological Society.
Déclaration de conflit d'intérêts
None of the authors has any conflict of interest with the paper or its result.
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