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KMID : 0858620070110020130
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Korean Journal of Audiology
2007 Volume.11 No. 2 p.130 ~ p.134
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Vibration-Induced Nystagmus and Head-Shaking Nystagmus in Patient with Cerebello-Pontine Angle Tumors
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Park Hong-Ju
Shin Jung-Eun
Ahn Jae-Yoon
Park Ga-Hyun
Jeong Yong-Soo
Kwak Hi-Boong
Lee Yeo-Jin
Yoo Jin-Seok
Koh Young-Cho
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Abstract
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Backgrounds and Objectives : It has been reported that vibration applied on the mastoids induces nystagmus in patients after unilateral vestibular neuritis. The aims of the study were to compare the results of vibration-induced nystagmus (VIN) and head-shaking nystagmus (HSN) tests to those of caloric test in patients with cerebello-pontine angle (CPA) tumors and to compare the results with those of patients with vestibular neuritis (VN), which was previously reported.
Materials and Methods : We compared results of VIN and HSN tests with those of caloric test in 15 patients (M : F=6 : 9, 23-74 years old) with CPA tumors. The eye movement recordings were made and the maximum slow-phase eye velocities (SPV) were calculated during vibration and after head-shaking. If spontaneous nystagmus was present, it was subtracted from the slow-phase eye velocities of VIN and HSN. Positive value of the slow-phase eye velocities means slow-phase eye movement to the lesioned side.
Results: VIN of which SPV was directed towards the lesioned side was observed in 13 (86%), towards the intact side in 1 (7%), and there was no VIN in 1 (7%). HSN of which SPV was directed towards the lesioned side was observed in 11 (74%), towards the intact side in 2 (13%), and there was no HSN in 2 (13%). Significant correlations were observed in between unilateral weakness and SPV of VIN, but not in between UW and SPV of HSN. There was no difference of regression lines between unilateral weakness and SPV of VIN in patients with CPA tumors and VN ; however, there was a significant difference in the intercept of the regression lines between unilateral weakness and SPV of HSN in both disorders.
Conclusion: Although there was no difference of the degree of the slow-phase eye velocity of vibration-induced nystagmus in both disorders, there was a significant decrease of the slow-phase eye velocity of head-shaking nystagmus in patients with CPA tumors compared to those with vestibular neuritis. Our results suggest that vibration-induced nystagmus represent the peripheral vestibular asymmetry ; however, head-shaking nystagmus represent the stored vestibular asymmetry in velocity storage system, which can be explained by central compensation and/or impairment of the velocity storage system by CPA tumors.
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KEYWORD
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Cerebello-pontine angle tumor, Caloric test, Vibration-induced nystagmus, Head-shaking nystagmus
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