Preliminary results on the contralateral effects of otoacoustic emissions in patients with brainstem dysfunction

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• 作者：Locatelli ; Tiziana ; Ravazzani ; Paolo ; Cursi ; Marco ; Medaglini ; Stefania ; Fornara ; Carla ; Leocani ; Letizia ; et. al.
• 刊名：Electroencephalography and Clinical Neurophysiology
• 出版年：1997
• 出版时间：July, 1997
• 年：1997
• 卷：103
• 期：1
• 页码：107-108
• 全文大小：253 K

文摘

In normal subjects, contralateral stimulation produces a reduction in amplitude of otoacoustic emissions (i.e. the acoustic signals which are produced by the inner ear and can be recorded in the auditory external ear canal) evoked in the tested ear. In this paper the effect of contralateral stimulation was studied on 18 patients with clinical signs of brainstem involvement. All patients were submitted to brain MRI evaluation and brainstem evoked potentials study. Otoacoustic emissions evoked by a 70 dB SPL click-stimulus were recorded in both ears of each subject with and without contralateral stimulation (30, 40, 50 dB SPL) without removing the probe, in order to avoid any possible interference in the measurement. In presence of brainstem lesions, we saw a lack of otoemission amplitude reduction, as usually seen in normals, confirming that this phenomenon may be related to the integrity of medial olivo-cochlear system.