Objective characteristics of nystagmus in horizontal semicircular canal benign paroxysmal positional vertigo
10.3760/cma.j.issn.1673-0860.2013.08.003
- VernacularTitle:水平半规管良性阵发性位置性眩晕患者眼震参数客观特征
- Author:
Fei-Yun CHEN
1
;
Tai-Sheng CHEN
;
Chao WEN
;
Shan-Shan LI
;
Peng LIN
;
Hui ZHAO
;
Qiang LIU
Author Information
1. 300192,天津医科大学一中心临床学院
- Keywords:
Vertigo;
Semicircular canals;
Otolithic membrane;
Electronystagmograph
- From:
Chinese Journal of Otorhinolaryngology Head and Neck Surgery
2013;48(8):622-627
- CountryChina
- Language:Chinese
-
Abstract:
Objective To discuss the objective characteristics and mechanism of nystagmus direction,intensity and time in horizontal semicircular canal benign paroxysmal positional vertigo (HSCBPPV).Methods A total of 233 patients with HSC-BPPV,whereas 179 horizontal semicircular canalithasis (HSC-Can) and 54 horizontal semicircular cupulolithiasis (HSC-Cup) were involved respectively.The induced nystagmus in roll tests recorded by video-nystagmograph(VNG),whose direction,intensity and time characteristics were compared in various BPPV.Results Horizontal nystagmus was both induced by turning left or right in HSC-BPPV roll tests.The direction of the induced nystagmus was the same with turning in HSC-Can.The latency,duration time and intensity (x ± s) turning to lesion and normal side were (1.922± 1.501)s and (1.447±0.855)s,(25.620 ± 10.409)s,and (22.110± 10.931)s,(56.441 ± 33.168)°/s and (24.239 ± 13.892)°/s in HSC-Can.The latency,duration time and intensity turning to lesion side were larger than normal side(t =3.715,15.219 and 4.070,P ＜ 0.01),the difference was statistically significant,and the intensity rate was about 2∶ 1.The direction of the induced nystagmus was opposite to turning in HSC-Cup.The intensity turning to normal side was larger than lesion side obviously.The intensity rate was about 2∶ 1,the difference was statistically significant(t =-7.634,P ＜ 0.01).While the latency and intensity of turning to lesion side in HSC-Can were larger than turn to normal side in HSCCup,and the difference detected no statistically significant difference (t =1.554 and 0.305,P ＞ 0.05).Conclusions The induced nystagmus intensity of head to two sides in roll tests for HSC-BPPV both follow Ewald's law,and the ratio between stronger and weaker are both 2∶ 1.These nystagmus parameters of VNG in roll tests are an objective guideline for BPPV diagnosis.
