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Research in Vestibular Science > Volume 14(1); 2015 > Article
Research in Vestibular Science 2015;14(1): 1-8.
전정질환에서 두부충동검사의 이용
이승한
전남대학교 의과대학 신경과학교실
Clinical Application of the Head Impulse Test in Vestibular Disorders
Seung Han Lee
Department of Neurology, Chonnam National University Medical School, Gwangju, Korea. nrshlee@chonnam.ac.kr
ABSTRACT
The head impulse test (HIT) is an established way to test the angular vestibulo-ocular reflex (aVOR) at the bedside. When the aVOR is normal, the eyes rotate opposite to the head movement through the angle required to keep images stable on the fovea. If the aVOR is impaired, the eyes move less than required and, at the end of the head rotation, the eyes are not directed at the intended target and the visual image is displaced from the fovea. A promptly-generated corrective saccade brings the image of the target back on the fovea. The identification of this corrective saccade is the signature feature of vestibular hypofunction and has greatly increased the utility of the bedside examination for identifying an aVOR deficit. However, sometimes it is not easy to detect corrective saccades without quantitative HIT devices. Exact execution and interpretation of the HIT are warranted to reduce the diagnostic errors, because the HIT has become an important part of the differential diagnosis of both acute and chronic vestibular disturbances.
Keywords: Head impulse test; Reflex, vestibulo-ocular; Vestibular neuronitis; Stroke
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