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KMID : 1039520180220010001
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Journal of Audiology & Otology
2018 Volume.22 No. 1 p.1 ~ p.5
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The Light Cupula: An Emerging New Concept for Positional Vertigo
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Kim Min-Beom
Hong Seok-Min
Choi Hye-Rang
Choi Seong-Jun
Pham Ngoc Chien
Shin Jung-Eun
Kim Chang-Hee
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Abstract
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Benign paroxysmal positional vertigo (BPPV) is the most common type of positional vertigo. A canalolithiasis-type of BPPV involving the lateral semicircular canal (LSCC) shows a characteristic direction-changing positional nystagmus (DCPN) which beats towards the lower ear (geotropic) on turning the head to either side in a supine position. Because geotropic DCPN in LSCC canalolithiasis is transient with a latency of a few seconds, the diagnosis can be challenging if geotropic DCPN is persistent without latency. The concept of “light cupula” has been introduced to explain persistent geotropic DCPN, although the mechanism behind it requires further elucidation. In this review, we describe the characteristics of the nystagmic pattern in light cupula and discuss the current evidence for possible mechanisms explaining the phenomenon.
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KEYWORD
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Light cupula, Positional vertigo, Head-roll test, Direction-changing positional nystagmus, Null plane
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