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Correlation between Spontaneous Nystagmus and Vestibular Function Test Parameters according to Gender and Age in Vestibular Neuritis
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Jae Yun Jung, Eun Seok Lim, Young Saeng Kim, Min Young Lee, Yong Won Chung, Chung Ku Rhee
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J Korean Bal Soc. 2006;5(2):248-252.
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 Abstract
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- Background
and Objectives: There are caloric test, SCEP, DP in Step velocity and VOR asymmetry in SHA test as parameters for evaluation in unilateral peripheral vestibulopathy in parameter of vestibular function test. The aim of this study is to assess the correlation between these parameters and intensity of spontaneous nystagmus in vestibular neuritis.
Materials and Method: We evaluated 75 patients who were diagnosed as vestibular neuritis with 3 degree spontaneous nystagmus at vestibular function test lab from January 2000 to July 2005 in Dankook university hospital. The correlations between direction and intensity of spontaneous nystagmus and monothermal caloric test, SCEP and DP in step velocity, VOR asymmetry (0.01, 0.04, 0.16 Hz) in SHA test were analysed. And correlations according to sex, age were also analysed.
Results
The correlation coefficient between intensity of spontaneous nystagmus and monothermal caloric test was 0.60. The correlation coefficient between intensity of spontaneous nystagmus and SCEP was 0.35. The correlation coefficient between intensity of spontaneous nystagmus and Tc DP was 0.36 and it showed no significant correlation. The correlation coefficient between intensity of spontaneous nystagmus and VOR asymmetry (0.01, 0.04, 0.16) was 0.57, 0.46, 0.51, respectively and there was higher correlation in man, age under 60.
Conclusion
Intensity of spontaneous nystagmus showed close relations to monothermal caloric test, VOR asymmetry of SHA, Tc DP, SCEP DP in sequence. In addition, young male patients tends to be closely related to intensity of spontaneous nystagmus.
Key Words : Spontaneous nystagmus, Vestibular function test, Vestibular neuritis
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A Promotive Effect of Low Level Laser on Hair Cell Viability in Postnatal Organotypic Culture of Rat Utricles
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Yong Won Chung, Jin Chul Ahn, Eun Seok Lim, Young Saeng Kim, Min Young Lee, Jae Yun Jung, Chung Ku Rhee
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J Korean Bal Soc. 2006;5(1):29-34.
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Abstract
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- Background
and Objectives: To culture and maintain mammalian hair cells is still a big challenge. In this study, long-term organotypic culture of rat utricular maculae was established to study vestibular hair cell. The effects of low level laser on hair cell viability in postnatal organotypic culture of rat utricles were investigated.
Materials and Method: Uticular explants were prepared from postnatal 2 to 7 rats and cultured. To improve hair cell survival, the utricles were irradiated daily with low level laser. Whole-mount utricles were stained with FM1-43 which is known to be an efficient marker to identify live hair cells in cultured tissues. Such cells visualized directly through tissue culture dish with cover glass bottom by Confocal laser scanning microscope at specific time points.
Results
The explanted utricular hair cells were cultured for up to 31 days in in vitro culture system. In low level laser irradiation group, utricular hair cells were more survived at 24 DIV and 31 DIV.
Conclusion
These results suggest that low level laser promotes hair cell viability in utricular explants.
Key Words : Organotypic culture, Low level laser, FM 1-43, Utricle
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Effect of Low Power Laser Irradiation on Gentamicin-Damaged Vestibular System in Guinea Pigs
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Chung Ku Rhee, Myoung Chan Kim, Eun Seok Lim, Young Saeng Kim
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J Korean Bal Soc. 2005;4(2):225-229.
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Abstract
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- Background
and Objectives:The purpose of this study was to investigate the characteristics of gentamicin-induced vestibulotoxicity of otolith organs and preventive effect of low power laser to vestibulotoxicity by assessing the result of earth vertical and the off vertical axis rotation tests.
Materials and Method: Twenty guinea pigs were grouped into two groups, laser and no laser group. Vestibulotoxicity was induced by intratympanic injection of gentamicin. Prevention of the vestibulotoxicity was studied by irradiation of low power laser. Off vertical axis rotation tilted 30 degree relative to the earth vertical axis was applied to evaluate the otolithic function.
Results
Gentamicin induced vestibulotoxicity was confirmed by gain decreasing in slow harmonic acceleration test and modulation decreasing in the off vertical axis rotation test. Prevention effect of low power laser to gentamicin induced vestibulotoxicity was confirmed by modulation maintaining in the off vertical axis rotation test and gain maintaining in the earth vertical axis rotation.
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