Objective characteristics of nystagmus in horizontal semicircular canal benign paroxysmal positional vertigo / 中华耳鼻咽喉头颈外科杂志
Chinese Journal of Otorhinolaryngology Head and Neck Surgery
;
(12): 622-627, 2013.
Article
in Chinese
| WPRIM
| ID: wpr-301423
ABSTRACT
<p><b>OBJECTIVE</b>To discuss the objective characteristics and mechanism of nystagmus direction, intensity and time in horizontal semicircular canal benign paroxysmal positional vertigo (HSC-BPPV) .</p><p><b>METHODS</b>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.</p><p><b>RESULTS</b>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 ([AKx(-)D] ± 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 HSC-Cup, and the difference detected no statistically significant difference (t = 1.554 and 0.305, P > 0.05).</p><p><b>CONCLUSIONS</b>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.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Semicircular Canals
/
Vertigo
/
Nystagmus, Pathologic
/
Diagnosis
/
Electronystagmography
/
Benign Paroxysmal Positional Vertigo
/
Head
Type of study:
Diagnostic study
/
Practice guideline
Limits:
Humans
Language:
Chinese
Journal:
Chinese Journal of Otorhinolaryngology Head and Neck Surgery
Year:
2013
Type:
Article
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