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Vestibular Dysfunction in Acute Cerebellar Ataxia
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Chang Min Lee
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Res Vestib Sci. 2015;14(1):21-25.
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 Abstract
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- Acute cerebellar ataxia is described as a clinical syndrome of acute onset of
cerebellar dysfunction with a good long-term prognosis. The pathogenesis of acute
cerebellar ataxia remains unclear. A 55-year-old woman presented with acute
onset of gait ataxia and dysarthria. The videonystagmography showed saccadic
pursuit and saccadic abnormalities including slightly prolonged latency and
hypometria. Rotational chair test revealed increased vestibuloocular reflex (VOR)
gains and a failure of VOR suppression by visual fixation. Brain magnetic
resonance imaging and cerebrospinal fluid examination were normal. The patient
was treated with steroids and made nearly complete recovery over a period of
3 months.
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Nystagmus in the Ictal Period of Vertebrobasilar Insufficiency
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Kun Woo Kim, Chang Min Lee, Jae Yun Jung, Myung Whan Suh
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Res Vestib Sci. 2010;9(3):114-117.
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Abstract
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- The nystagmus of vertebrobasilar insufficiency (VBI) patients is not clearly understood. In this article we report a videonystagmography (VNG) result which had been recorded in a VBI patient during his ictal period. The spontaneous nystagmus was purely torsional toward the left side. During the various positional tests, up beating left torsional and right horizontal nystagmus was found. Right beating horizontal nystagmus was stronger when the head was turned to the left side. But we were not able to explain the exact mechanism of this nystagmus. Although the mechanism is not fully understood the pattern of nystagmus reported in this article may be helpful in distinguishing VBI from other diseases by means of VNG recording.
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Unilateral Parieto-Occipital Lobe Infarction Presenting with Optic Ataxia and v
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Sung Chul Jung, Chang Min Lee
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J Korean Bal Soc. 2006;5(2):320-324.
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Abstract
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- Optic ataxia is characterized by an impaired visual control of the direction of arm reaching to a visual target, accompanied by defective hand orientation and grip formation. In humans, optic ataxia is associated with lesions of the superior parietal lobule, which also affect visually guided saccades and other forms of eye-hand coordination. A 67-year-old woman presented with sudden, unilateral, direct optic ataxia in the right homonymous half field and saccadic abnormalities which consisted of prolonged latency, undershoot dysmetria, and decreased velocity. Brain MRI showed a left parieto-occipital watershed infarction. It is suggested that lesions of the superior parietal lobule and the adjacent parietal eye field are responsible for optic ataxia and saccadic abnormalities, respectively.
Key Words: Optic ataxia, Saccade, Infarction, Superior parietal lobule
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Hyperventilation Induced Nystagmus in Patient with Vestibular Schwannoma : A Case Report
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Yoon Jeong Chang, Geun Ho Lee, Chang Min Lee, Young Mok Song, Chung Ku Rhee, Jae Il Kim
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J Korean Bal Soc. 2004;3(1):177-179.
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Abstract
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- When doctors evaluate the complaints of dizziness, they often perform a series of clinical tests to look for the
evidence of a vestibular dysfunction. A useful procedure is to ask the patient to take deep breaths and observe the gaze
behind Frenzel goggles. If hyperventilation-induced nystagmus(HIN) is detected, it is the evidence for an underlying
vestibular imbalance. The authors evaluated nystagmus with electronystagmography after hyperventilation for 50
seconds. Brain imaging was performed to search the responsible lesion for dizziness. Brain MRI revealed a brain tumor
suggesting vestibular schwannoma in the left cerebellopontine angle. After hyperventilation, dizziness and the right
beating horizontal nystagmus with Alexander law could be detected. By precisely measuring the HIN, we determined
that inputs arising from the horizontal semicircular canal were mainly responsible. The contralaterality of the direction
of the horizontal component of the nystagmus was detected. We suggest that clinicians should routinely check the
nystagmus after hyperventilation, when they evaluate patients complaining of dizziness.
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