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  • Title: [Light cupulopathy: persistent direction changing positional nystagmus with a null plane].
    Author: Wang SJ, Jiang H, Gao ZQ, Wu HY.
    Journal: Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi; 2017 Mar 07; 52(3):210-214. PubMed ID: 28395493.
    Abstract:
    Objective: The purpose of this study was to report two cases of light cupulopathy, and describe the characteristics of these cases and analysis the possible physiopathological mechanisms. Methods: The histories, clinical features, characteristics of nystagmus, and vestibular function, as well as audiologic results of the two patients with light cupula were analyzed. Results: The two patients showed persistent geotropic direction changing positional nystagmus(DCPN)in the supine head roll tests. The null plane was present when the head was turn slightly towards affected side. Canalith repositioning maneuver was not effective. A mild sensorineural hearing loss was found on the involved ear in one patient but not in the other. The vestibular functions of two patients were abnormal. Conclusions: The characteristics of nystagmus with light cupulopathy are persistent geotropic DCPN with a null plane. The clinical features are similar with the horizontal semicircular canal canalolithasis. Canalith repositioning maneuver is not recommended for its ineffectiveness. 目的：报告2例轻嵴帽病病例，分析该病的临床特征，并探讨可能的病理生理机制。 方法：分析2例轻嵴帽病患者的病史、临床表现、前庭功能、听力学检查结果，总结其临床特征。 结果：2例患者均表现出典型的水平半规管轻嵴帽病眼震特点。在仰卧位滚转试验(roll test)测试时表现为持续向地性变向位置性眼震(direction changing positional nystagmus, DCPN)，同时可记录到无效平面。试行Barbecue耳石复位治疗无效。2例患者均表现为前庭功能检查结果异常，其中1例患者伴有患耳突发性聋病史。 结论：轻嵴帽病患者的眼震特点为持续变位性向地性眼震，伴有无效平面。临床表现类似水平半规管管石症，复位治疗无效，不宜进行无意义的反复复位治疗。.
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