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Research in Vestibular Science > Volume 11(3); 2012 > Article
Research in Vestibular Science 2012;11(3): 97-104.
정상인에서 골진동 자극에 대한 외안근 전정유발근전위
, , , , , , 양태호1, 오선영1-3, 김태우1, 신병수1-3, 이준영1, 정슬기1-3, 서만욱1-3
1전북대학교병원 신경과, 2전북대학교 의학전문대학원 신경과학교실, 3임상의학연구소
Ocular Vestibular Evoked Myogenic Potentials Produced by Stimulation With Bone-conducted Vibration in Healthy Subjects
Tae Ho Yang, Sun Young Oh, Tae Woo Kim, Byoung Soo Shin, Jun Young Lee, Seul Ki Jeong, Man Wook Seo
1Department of Neurology, Chonbuk National University Hospital, Jeonju, Korea. ohsun@jbnu.ac.kr
2Department of Neurology, Chonbuk National University College of Medicine, Jeonju, Korea.
3Research Institute of Clinical Medicine of Chonbuk National University-Chonbuk National University Hospital, Jeonju, Korea.
ABSTRACT
Background and Objectives:   To provide the empirical basis for using ocular vestibular evoked myogenic potentials (oVEMPs) in response to bone-conducted vibration (BCV) stimulation to indicate vestibular function in normal subjects.
Materials and Methods:  
In response to bone-conducted tone burst (90 dB nHL and 100 dB nHL with frequencies 500 Hz and 1,000 Hz, the oVEMPs were measured in 45 healthy controls. The early negative component (n10) of the oVEMP to brief BCV of the forehead and at each mastoid process is recorded by surface electromyography electrodes just beneath the eyes. We used a hand-held vibrator (Bruel and Kjaer 4810 Mini-Shaker) placed on the forehead, in the midline at the hairline (Fz) and at each mastoid process and quantified the individual differences in n10 magnitude, latency and symmetry to Fz and mastoid BCV at each frequency.
Results:  
In normal subjects, n10 responses were symmetrical in the two eyes during Fz and both mastoid stimuli and the latencies of the onset were consistent among subjects. Response rate is similar between Fz and mastoid stimuli. However, at each stimulation site, response rate is higher on 500 Hz than on 1,000 Hz stimulation. During the mastoid stimuli, the onset latency is slightly shorter and amplitude is larger than the Fz stimuli. The average amplitudes decreased with age and average latency (to peak) increased slightly with increasing age.
Conclusion:  
Clear oVEMP responses to bone-conducted Fz and mastoid stimuli were evoked from normal subjects. It is concluded that bone-conducted stimuli as well as air conduction can evoke myogenic potentials from the ocular muscles.
Keywords: Bone-conducted vibration; Vestibular evoked myogenic potential; Ocular vestibular evoked myogenic potential
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