Clinical Significance of Perverted Head-Shaking Nystagmus
10.21790/rvs.2017.16.4.119
- Author:
Tae Ho YANG
1
;
Byung Soo SHIN
;
Man Wook SEO
;
Sun Young OH
Author Information
1. Department of Neurology, Chonbuk National University School of Medicine, Jeonju, Korea. ohsun@jbnu.ac.kr
- Publication Type:Original Article
- Keywords:
Nystagmus;
Vestibular function test;
Vestibuloocular reflex;
Central origin vertigo;
Peripheral vertigo
- MeSH:
Benign Paroxysmal Positional Vertigo;
Cerebellar Ataxia;
Darkness;
Dizziness;
Head;
Humans;
Medical Records;
Meniere Disease;
Migraine Disorders;
Neurologic Examination;
Reflex;
Reflex, Vestibulo-Ocular;
Stroke;
Vertebrobasilar Insufficiency;
Vertigo;
Vestibular Function Tests
- From:Journal of the Korean Balance Society
2017;16(4):119-128
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
OBJECTIVES: We investigated clinical significance of head shaking nystagmus (HSN) and perverted HSN (pHSN) in patients with peripheral and central vestibular disorders. METHODS: We reviewed medical records of 822 consecutive subjects who were referred to a dizziness clinic. We performed neurologic examination including video-oculography in darkness for 60 seconds before, during and for 100 seconds after head-shaking. HSN was considered to develop when post-head-shaking nystagmus last at least 5 beats with latency from end of head-shaking of no more than 5 seconds, and a velocity at least 3°/sec. RESULTS: In control group (n=45), there were observed spontaneous nystagmus (SN) in 2.2%, HSN in 17.8%, pHSN in 6.7%. In patients with peripheral vestibular disorder group (n=397), there were observed SN in 14.1%, HSN in 40.6%, pHSN in 9.8%. In patients with central vestibular disorder group (n=217), there were observed SN in 17.5%, HSN in 24.0%, pHSN in 13.4%. In unspecified dizziness group (n=208), there were observed SN in 1.9%, HSN in 13.0%, pHSN in 1.9%. pHSN was frequently observed in central vestibular disorders such as stroke, vestibular migraine, cerebellar ataxia, and vertebro-basilar insufficiency. However, pHSN was also observed at higher rate than expected in peripheral vestibular disorders including benign paroxysmal positional vertigo especially involving vertical canals, Meniere disease and even in unilateral vestibulopathy. CONCLUSIONS: Our results show that perverted HSN in dizzy populations was frequently observed not only in cases of central vestibular disorders but also in peripheral disorders. Perverted HSN can develop by any conditions that cause difference in vestibular velocity storage in vertical component of vestibular-ocular reflex.
