Persistent geotropic direction-changing positional nystagmus (DCPN) has been described in recent years as no latency or fatigability but a null plane when head is turned toward the affected side. Different from the canalolithiasis of horizontal semicircular canal, it is similar with cupulolithiasis, but the direction of nystagmus are opposite. Light cupula theory has been used to explain the characteristics of this unique nystagmus. In this paper, the characteristics, possible etiologies, pathogenesis, related diseases, diagnosis, treatment and prognosis of DCPN are reviewed.
持续性向地性变向性位置性眼震(direction-changing positional nystagmus，DCPN)是近年来临床上新发现的一种位置性眼震，持续时间大于1 min，无潜伏期，无疲劳性，且存在眼震消失平面(又称零平面、无效平面)。眼震特征明显不同于管结石型水平半规管良性阵发性位置性眩晕，反而类似于嵴帽结石症，但眼震方向与嵴帽结石症相反，因此"轻嵴帽"的假说被提出，用于解释这一眼震特征。本文对持续性向地性DCPN的特征、可能病因、发生机制、相关疾病、诊断、治疗和预后等进行综述。.
Keywords: Light cupula; Nystagmus, pathologic.