Posterior semicircular canal paroxysmal positional vertigo triggers a new type of windmill nystagmus.
Benign Paroxysmal Positional Vertigo
Cerebellum
Otoliths
Journal
The Journal of laryngology and otology
ISSN: 1748-5460
Titre abrégé: J Laryngol Otol
Pays: England
ID NLM: 8706896
Informations de publication
Date de publication:
Jan 2020
Jan 2020
Historique:
pubmed:
18
12
2019
medline:
26
2
2020
entrez:
18
12
2019
Statut:
ppublish
Résumé
Periodic alternating nystagmus is a rare condition characterised by spontaneous horizontal nystagmus that periodically reverses direction, indicating an alteration of the velocity storage mechanism. Windmill nystagmus is a peculiar and rare variant of periodic alternating horizontal nystagmus with a superimposed periodic alternating vertical nystagmus. It is generally observed in blind patients. This paper presents the unique case of a normally sighted patient with a windmill nystagmus triggered by an episode of benign paroxysmal positional vertigo due to bilateral posterior canalolithiasis. Videonystagmography revealed an anticlockwise up-beating nystagmus followed by a clockwise down-beating nystagmus with a cycle lasting 2 minutes, followed by a brief burst of horizontal left-beating nystagmus. This case report represents the first observation of a new type of windmill nystagmus, probably provoked by a malfunction of the velocity storage mechanism, gaze-stabilisation and short-adaptation networks, with a loss of cerebellar inhibition.
Sections du résumé
BACKGROUND
BACKGROUND
Periodic alternating nystagmus is a rare condition characterised by spontaneous horizontal nystagmus that periodically reverses direction, indicating an alteration of the velocity storage mechanism. Windmill nystagmus is a peculiar and rare variant of periodic alternating horizontal nystagmus with a superimposed periodic alternating vertical nystagmus. It is generally observed in blind patients.
CASE REPORT
METHODS
This paper presents the unique case of a normally sighted patient with a windmill nystagmus triggered by an episode of benign paroxysmal positional vertigo due to bilateral posterior canalolithiasis. Videonystagmography revealed an anticlockwise up-beating nystagmus followed by a clockwise down-beating nystagmus with a cycle lasting 2 minutes, followed by a brief burst of horizontal left-beating nystagmus.
CONCLUSION
CONCLUSIONS
This case report represents the first observation of a new type of windmill nystagmus, probably provoked by a malfunction of the velocity storage mechanism, gaze-stabilisation and short-adaptation networks, with a loss of cerebellar inhibition.
Identifiants
pubmed: 31843038
doi: 10.1017/S0022215119002469
pii: S0022215119002469
doi:
Types de publication
Case Reports
Journal Article
Langues
eng
Sous-ensembles de citation
IM