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J Korean Bal Soc > Volume 3(2); 2004 > Article
Journal of the Korean Balance Society 2004;3(2): 351-335.
정상인에서 중심성 회전과 편심성 회전에서 전정안 반사의 비교
, , , , 조병한1, 장승연1, 최호석1, 이승철2, 김규성1,3
인하대학교 의과대학 이비인후과학교실1, 소리이비인후과2, 인하대학교 의과학연구소 항공우주의학연구회3
Comparison of Vestibule-ocular Reflex of Eccentric Rotation with Centric Rotation in Normal Subjects
Byung Han Cho, Seung Yeun Jang, Ho Suk Choi, Seung Chul Lee, Kyu Sung Kim
1Department of Otorhinolaryngology-Head & Neck Surgery, Inha University College of Medicine, Korea. stedman@inha.ac.kr
2Soree Ear Clinic, Korea.
3Aerospace Medicine Research Group of Inha Research Institute for Medical Sciences at Inha University, Korea.
ABSTRACT
Background and Objectives : Conventional vestibular rotation testing with the head centered on the axis stimulates the semicircular canals evoking compensatory eye movements. By placing subjects off from the axis of rotation, the otolithic organ may also be simultaneously stimulated by additional linear acceleration forces. In the present study, we compared the rotation with subjects placed on axis to those placed in an eccentric position. Materials and Method : In the eccentric rotation, the head of subject was facing outward and placed eccentrically for 33cm on naso-occipital axis. Slow harmonic acceleration test and velocity step test were performed. Results : The sinusoidal eccentric rotation at 0.32, 0.64 Hz produced a significantly higher vestibulo-ocular reflex gain than did on axis rotation. In velocity step test, initial slow component velocity was significantly higher in eccentric rotation than in centric rotation. Conclusion : These finding suggest that the gain enhancement due to eccentric rotation is a result of tangentiallinear acceleration, probably sensed by the otolithic organ. This study raises the possibility of using eccentric rotation for the diagnosis of the patients with otolithic dysfunction.
Keywords: Vestibule-ocular reflex; Otolith; Rotation
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