Kim Min-Beom, Hong Seok Min, Choi Hyerang, Choi Seongjun, Pham Ngoc Chien, Shin Jung Eun, Kim Chang-Hee
Department of Otorhinolaryngology-Head and Neck Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
Department of Otorhinolaryngology-Head and Neck Surgery, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
J Audiol Otol. 2018 Jan;22(1):1-5. doi: 10.7874/jao.2017.00234. Epub 2017 Oct 24.
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.
良性阵发性位置性眩晕（BPPV）是最常见的位置性眩晕类型。涉及外侧半规管（LSCC）的管结石型BPPV表现出特征性的变向性位置性眼震（DCPN），在仰卧位向两侧转头时，眼震朝向较低的耳朵（地向性）。由于LSCC管结石症中的地向性DCPN是短暂的，潜伏期为几秒，如果地向性DCPN持续存在且无潜伏期，则诊断可能具有挑战性。“轻嵴帽”的概念已被引入以解释持续性地向性DCPN，尽管其背后的机制需要进一步阐明。在本综述中，我们描述了轻嵴帽眼震模式的特征，并讨论了解释该现象的可能机制的当前证据。
