[Necessity of repeated roll test in horizontal semicircular canalithasis positioned diagnosis].
OBJECTIVE
To investigate the influence of repeated roll test in horizontal semicircular canalithasis(HSC-Can) positioned diagnosis, so as to investigate the cecessity of repeated roll test.


METHODS
The patients with a chief complaint of positional vertigo accepted two consecutive cycles roll test, the evoked nystagmus characteristics of each cycle recorded by video-nystagmuograph(VNG), whose direction, intensity, time and other parameters characteristics were analyzed in 51 HSC-Can.


RESULTS
Horizontal nystagmus in the same direction with turning were induced in HSC-Can roll test. In 51 HSC-Can, roll test cycle 1 and cycle 2 induced nystagmus same strength side in 26 cases(51.0%), of which 19 cases with stronger nystagmus intensity in cycle 2, another 7 cases were weaker; the opposite strength side of the two loops induced nystagmus, and cycle 1 evoked nystagmus intensity were weaker than cycle 2, based on cycle 2 results determined HSC-Can affected side in 25 cases (49.0%). Lesion and normal side in cycle 1 induced nystagmus duration (x±s, the same below) were (13.4±11.5)s and (14.1±9.9)s, respectively intensity (18.1±22.4)°/s and (13.0±12.0)°/s; as in cycle 2 induced nystagmus duration was (20.7±10.2)s and (18.0±12.0)s, strength respectively(40.4±28.0)°/s and (15.6 ±11.2)°/s. Cycle 2 ipsilateral rotor position evoked nystagmus showed longer duration and stronger intensity than cycle 1. Between two cycle induced ipsilateral nystagmus duration, intensity differences were statistically significant (t values were -4.233 and -5.154, P=0.000). 51 HSC-Can patients, 44 patients selected repositioning maneuver, after 1-2 times of maneuver, 41 cases (93.2%) showed complete resolution of symptoms, all cases's symptoms were improved; other 7 patients selected medication only.


CONCLUSIONS
The proposed suspicious HSC-Can patients should receive at least two cycles roll test, and mainly in the second cycle could determine the location of the responsible semicircular canals.
Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Center Hospital, Otorhinolaryngology Institute of Tianjin, Tianjin 300192, China.
H H
HH
Lu
First Center Clinic College, Tianjin Medical University, Tianjin 300070, China.
Y
Y
Zhao
Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Center Hospital, Otorhinolaryngology Institute of Tianjin, Tianjin 300192, China.
T S
TS
Chen
Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Center Hospital, Otorhinolaryngology Institute of Tianjin, Tianjin 300192, China.
K X
KX
Xu
Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Center Hospital, Otorhinolaryngology Institute of Tianjin, Tianjin 300192, China.
W
W
Wang
Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Center Hospital, Otorhinolaryngology Institute of Tianjin, Tianjin 300192, China.
Q
Q
Liu
Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Center Hospital, Otorhinolaryngology Institute of Tianjin, Tianjin 300192, China.
C
C
Wen
Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Center Hospital, Otorhinolaryngology Institute of Tianjin, Tianjin 300192, China.
S S
SS
Li
First Center Clinic College, Tianjin Medical University, Tianjin 300070, China.
X J
XJ
Li
Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Center Hospital, Otorhinolaryngology Institute of Tianjin, Tianjin 300192, China.
X
X
Han
Department of Otorhinolaryngology Head and Neck Surgery, Tianjin First Center Hospital, Otorhinolaryngology Institute of Tianjin, Tianjin 300192, China.
P
P
Lin
D065635:Benign Paroxysmal Positional Vertigo / Q000503:physiopathology*; D003939:Diagnostic Techniques, Otological; D006801:Humans; D009759:Nystagmus, Pathologic / Q000209:etiology / Q000503:physiopathology*; D012665:Semicircular Canals; D013997:Time Factors