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Follow-up Changes of Eye Movements by Caloric Stimulation in Patients With Vestibular Neuritis
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Mun Su Park, Ga Hyun Park, Yong Soo Jeong, Yeo Jin Lee, Jung Eun Shin, Hong Ju Park
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J Korean Bal Soc. 2008;7(1):33-37.
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 Abstract
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- Background and Objectives: A significant recovery of resting activity in the vestibular nuclei ipsilateral to the unilateral labyrinthectomy has been reported by the time symptoms such as spontaneous nystagmus and roll head tilt have largely disappeared. However, the dynamic vestibular response after unilateral vestibular loss to passively imposed vestibular stimuli does not recover.
Materials and Methods: We investigated changes of the caloric responses in 32 patients with vestibular neuritis during in- and out-patient visits separated by 2 months in an attempt to identify changes brought about by peripheral and/or central compensation processes.
Results: The slow-phase eye velocities stimulated by warm caloric stimulation at acute and follow-up stage were 6.6±6.6°/s, 9.5±9.9°/s in the lesioned side; 28.4±19.1°/s, 24.5±11.6°/s in the intact side. The slow-phase eye velocities stimulated by cold caloric stimulation at acute and follow-up stage were 5.9±7.7°/s, 10.3±8.2°/s in the lesioned side; 19.8±10.3°/s, 18.8±9.9°/s in the intact side.
Conclusion: Our findings show that the recovery of caloric responses comes mostly from the recovery of the eye responses to the caloric stimulation in the lesioned side and the eye responses to the caloric stimulation in the intact side does not change over time after vestibular neuritis.
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Results of Vestibular Function Tests in Patients with Cerebello-Pontine Aangle Tumors
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Hyang Ae Shin, Yong Soo Jeong, Jin Suk Yoo, HongJu Park
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J Korean Bal Soc. 2006;5(2):253-261.
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Abstract
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- Background
and Objectives: Acoustic neuroma (AN) is commonly encountered in the cerebello-pontine angle (CPA) and AN arises principally from the vestibular division of the nerve, which can show not only hearing disturbance but also various vestibular symptoms and laboratory findings by affecting central and peripheral vestibular system. Vestibular testing is reported not to be a useful screening test for AN, but can be helpful in defining whether the tumor arises from the superior or inferior division and identifying the cause of dizziness or vertigo.
Materials and Method: We are presenting four patients with CPA tumors accompanied by various abnormal findings of vestibular function tests including head-shaking nystagmus, vibration-induced nystagmus, hyperventilation- induced nystagmus and vestibular evoked myogenic potential and subjective visual vertical, which can enable us to understand the pathomechanism of the abnormal results.
Results
All patients presented hearing loss and mild dizziness. Caloric test, head thrust test and vibration-induced nystagmus was helpful in localizing the disease, but head-shaking nystagmus and hyperventilation-induced nystagmus was less helpful. Otolith tests did not always show abnormal results.
Conclusion
We should consider abnormal results of the vestibular function tests in a whole to estimate the status of vestibular compensation in patients with CPA tumors.
Key Words : Nystagmus, Subjective visual vertical, Acoustic neuroma
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KBS
