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KMID : 0361019980410070856
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Korean Journal of Otolaryngology - Head and Neck Surgery
1998 Volume.41 No. 7 p.856 ~ p.861
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Active Head Rotation Test in Unilateral and Bilateral Peripheral Vestibulopathy
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박현민/Hyun Min Park
김영훈/이정구/Young Hoon Kim/Chung Ku Rhee
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Abstract
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Background and Objectives: Active head rotation test measures vestibulo-ocular reflex at frequencies of 1 ㎐ to 8 Hz which correspond to the frequencies of head movements in daily living. However, the normative data of several authors are
not in
unity, and the usefulness of the test in the evaluation of the peripheral vestibulopathy is yet to be determined. The purpose of this study is to make our own normative data using our own testing condition and facilities and to evaluate the
usefulness
of the test in the evaluation of the peripheral vestibulopathy. Materials and Methods: Active head rotation test was performed in 22 controls and 34 peripheral vestibulopathy patients (24 unilateral, 10 bilateral) using the VORTEQ system
in
darkness with eyes open(VOR-EO). Gain, phase and symmetry were compared between the control group and the patients groups. Results: The control group showed the gain of 1.0 to 1.1 at frequencies of 1 ㎐ to 4 ㎐. Phase was between 4 to 7
degrees,
and symmetry was close to zero unilateral vestibulopathy group did not show a significant difference in gain, phases and symmetry from the normal group at the majority of frequencies. bilateral vestibulopathy group showed a significant gain
reduction
compared to the normal group and unilateral group (p<0.05). But phase and symmetry were not significantly different.
Conclusion: The active head rotation test was not useful in evaluating unilateral peripheral vestibulopathy although it
was
useful in assessing functional deficit of VOR in bilateral vestibulopathy.
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KEYWORD
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