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KMID : 0361020100530120761
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Korean Journal of Otolaryngology - Head and Neck Surgery
2010 Volume.53 No. 12 p.761 ~ p.767
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Evaluation of Vestibular Function in Idiopathic Sudden Sensorineural Hearing Loss
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Park Keon
Chung Jae-Ho
Min Hyun-Jung
Lee Seung-Hwan
Park Chul-Won
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Abstract
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Background and Objectives : It is very important to evaluate vestibular function in patients with sudden sensorineural hearing loss (SNHL) because vertigo combined with sudden SNHL is well known as an important prognostic factor. However, the vestibular function test is not usually performed in sudden SNHL patients without vertigo. We investigated whether different vestibular function tests such as the results of vestibular evoked myogenic potential (VEMP) testing or caloric testing were correlated to prognosis in not only sudden SNHL patients with vertigo but also in sudden SNHL patients without vertigo.
Subjects and Methods:We enrolled in our study 47 patients with idiopathic sudden SNHL with vertigo or without vertigo. The degree of initial hearing loss was categorized as mild, moderate, moderate-severe, severe, and profound group. Types of initial audiograms were categorized as high tone loss, low tone loss, flat and scale out type. We analyzed the association of the VEMP and caloric test with degree of hearing loss, type of audiogram, and hearing recovery in two month.
Results: The more sever the hearing loss was, the more increased was the rate of abnormal VEMP response (p=0.003). The rate VEMP and caloric abnormality was higher in hearing loss types with high tone loss than in the types with only low tone loss. The rate of accompanying vertigo was high (p=0.017), when the hearing loss was more severe. There was significant correlation between the hearing recovery and vestibular dysfunction (p=0.000, r=0.563).
Conslusion: VEMP and caloric test are useful in evaluating vestibular function and prognosis of sudden SNHL patients.
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KEYWORD
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Sudden hearing loss, Evoked potential, Caloric test
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