Investigation of the reverse phase nystagmus in positioning test for benign paroxysmal positional vertigo
10.3760/cma.j.issn.1673-0860.2014.05.007
- VernacularTitle:良性阵发性位置性眩晕患者变位试验反转相眼震的初步观察
- Author:
Chao WEN
1
;
Taisheng CHEN
;
Feiyun CHEN
;
Qiang LIU
;
Shanshan LI
;
Yan CHENG
;
Peng LIN
Author Information
1. 300192,天津市第一中心医院耳鼻咽喉头颈外科 天津市耳鼻咽喉科研究所
- Keywords:
Vertigo;
Vestibular function tests;
Nystagmus,pathologic
- From:
Chinese Journal of Otorhinolaryngology Head and Neck Surgery
2014;(5):384-389
- CountryChina
- Language:Chinese
-
Abstract:
Objective 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.Methods There were 183 cases with BPPV , including 108 cases (59.0%) of posterior semicircular canal canalthasis , 55 cases ( 30.1%) of horizontal semicircular canal canalthasis, and 15 cases(8.2%) of horizontal and posterior semicircular canal cupulolithiasis and 5 cases (2.7%) of anterior semicircular canalithasis .The video-nystagmograph 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.Results There were no reversal phase nystagmus in 15 cases of semicircular canal cupulolithiasis and 5 cases of anterior semicircular canalithasis .After the disappearance of vertical nystagmus which induced by hanging position ( the first phase nystagmus ) in 108 cases of posterior semicircular canalithasis of Dix-Hallpike test , there was 54 cases ( 50.0%) of posterior semicircular canal canalthasis displayed downward vertical nystagmus (reverse phase nystagmus ) .The latency, duration time and intensity of the first phase nystagmus and reverse phase nystagmus were [(2.00 ±1.10)s, (3.54 ±1.42)s], [(16.27 ±4.95)s, (61.65 ±33.69) s] and [ ( 51.80 ±25.25 ) °/s, ( 10.65 ±6.29 ) °/s ] respectively; 43 cases ( 78.2%) of horizontal semicircular canal canalithasis displayed the opposite to turning head ( reverse phase nystagmus ) after the horizontal nystagmus , similar with turning head disappeared in Roll test.The latency, duration time and intensity of the first phase of nystagmus and reverse phase nystagmus were [(1.67 ±1.07) s, (3.57 ± 1.89)s], [(25.19 ±9.74) s, (70.48 ±40.26) s] and [(68.47 ±30.18)°/s, (11.22 ±8.78)°/s] respectively.Comparing with the latency , duration time , intensity of first phase nystagmus and reverse phase nystagmus of posterior and horizontal semicircular canal canalithasis , the differences had statistical significances (P<0.05).Comparing with the first phase nystagmus of reverse phase and no reverse phase nystagmus canalithasis , the difference of nystagmus intensity had statistical significances ( P<0.05); but the differences of latency and duration of nystagmus had no significant difference ( P>0.05).Conclusions It is common in PSC-Can and HSC-Can patients that reverse phase nystagmus is one of the clinical features of canalithasis.It appears in side head position of Rolling test or the hanging of Dix-Hallpike test.More power of the first phase nystagmus has , reverse phase nystagmus will be induced much easier.In comparison of the reverse phase nystagmus , the first phase nystagmus has the shorter incubation and duration , but it has more power .It is helpful to avoid interruptions of clinical statolith positioning and reset since we recognize the reverse phase nystagmus.The mechanism might be similar to the vestibular mirror image nystagmus.It is another form of the vestibular mirror image nystagmus in BPPV patients.
