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Clinical course of persistent geotropic direction-changing positional nystagmus with neutral position-Light cupula

Toru Seo¹, Ko Shiraishi¹, Takaaki Kobayashi¹

¹a Department of Otolaryngology , Kinki University Faculty of Medicine , Osakasayama, Osaka , Japan.

Acta Oto-Laryngologica

|September 19, 2015

Abstract

Conclusion:

A short clinical course and frequent recurrence are common features of persistent geotropic direction-changing positional nystagmus with neutral position (positional nystagmus of light cupula: PNLC) and cupulolithiasis of the lateral semicircular canal. It is suggested that PNLC is caused by light debris attached to the cupula of the lateral semicircular canal.

Objectives:

PNLC is a sub-type of direction-changing positional nystagmus. It is thought to be caused by anti-gravitational deviation of the cupula of the lateral semicircular canal (light cupula); however, the exact mechanism is yet to be elucidated. To this end, the clinical features of PNLC were studied.

Method:

Clinical charts of 27 patients (13 men and 14 women) with PNLC were reviewed.

Results:

The nystagmus had resolved within a week in 70% and within 30 days in 89% of the patients. The recurrence rate was 33%. The subjects did not have a history of alcohol intake, head trauma, or vestibular neuritis.

Keywords:

Ampulla anti-gravitational deviation lateral semicircular canal light cupula

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