Investigation of the reverse phase nystagmus in positioning test for benign paroxysmal positional vertigo

• Published in: Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery Vol. 49; no. 5; p. 384
• Main Authors: Wen, Chao, Chen, Taisheng, Chen, Feiyun, Liu, Qiang, Li, Shanshan, Cheng, Yan, Lin, Peng
• Format: Journal Article
• Language: Chinese
• Published: China 01.05.2014
• Subjects: Adult; Aged; Aged, 80 and over; Benign Paroxysmal Positional Vertigo - physiopathology; Female; Humans; Male; Middle Aged; Nystagmus, Pathologic - physiopathology; Semicircular Ducts - pathology; Vestibular Function Tests
• ISSN: 1673-0860

To investigate the clinical significances and formation mechanism by analyzing the characteristics of the reverse phase nystagmus parameters from benign paroxysmal positional vertigo (BPPV) positioning test. There were 183 cases with BPPV, including 108 cases (59.0%) of posterior semicircular canal canalithiasis, 55 cases (30.1%) of horizontal semicircular canal canalithiasis, and 15 cases (8.2%) of horizontal and posterior semicircular canal cupulolithiasis and 5 cases (2.7%) of anterior semicircular canalithiasis . The video-nystagmography was utilized in positioning tests to induce nystagmus. The direction, intensity, time parameters characteristic of vertical nystagmus in Dix-Hallpike test and horizontal nystagmus in roll test were analyzed and compared. There were no reversal phase nystagmus in 15 cases of semicircular canal cupulolithiasis and 5 cases of anterior semicircular canalithiasis. After the disappearance of vertical nystagmus which induced by hanging position (the first phase nystagmus) in 108