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Significance of vestibular Testing on Distinguishing the nerve of Origin for vestibular Schwannoma and Predicting the Preservation of Hearing

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Chinese Medical Journal 2016年第7期129卷 799-803页

作者： Yu-Bo He Chun-Jiang Yu Hong-Ming Ji Yan-Ming Qu Ning Chen Department of Neurosurgery Sanbo Brain Hospital Capital Medical University Beijing 100093 China Department of Neurosurgery Shanxi Provincial People's Hospital Taiyuan Shanxi 030012 China

Background： Determining the nerve of origin for vestibular schwannoma （VS）, as a method for predicting hearing prognosis, has not been systematically considered. The vestibular test can be used to investigate the function of the superior vestibular nerve （SVN） and the inferior vestibular nerve （IVN）. This study aimed to preoperatively distinguish the nerve of origin for VS patients using the vestibular test, and determine if this correlated with hearing preservation. Methods： A total of 106 patients with unilateral VS were enrolled in this study prospectively. Each patient received a caloric test, vestibular-evoked myogenic potential （VEMP） test, and cochlear nerve function test （hearing） before the operation and 1 week, 3, and 6 months, postoperatively. All patients underwent surgical removal of the VS using the suboccipital approach. During the operation, the nerve of tumor origin （SVN or IVN） was identified by the surgeon. Tumor size was measured by preoperative magnetic resonance imaging. Results： The nerve of tumor origin could not be unequivocally identified in 38 patients （38/106, 35.80%）. These patients were not subsequently evaluated. In 26 patients （nine females, seventeen males）, tumors arose from the SVN and in 42 patients （18 females, 24 males）, tumors arose from the IVN. Comparing with tile nerve of origins （SVN and IVN） of tumors, the results of the caloric tests and VEMP tests were significantly different in tumors originating from the SVN and the IVN in our study. Hearing was preserved in 16 of 26 patients （61.54%） with SVN-originating tumors, whereas hearing was preserved in only seven of 42 patients （16.67%） with IVN-originating tumors. Conclusions： Our data suggest that caloric and VEMP tests might help to identify whether VS tumors originate from the SVN or IVN. These tests could also be used to evaluate the residual function of the nerves after surgery. Using this information, we might better predict the preservation of hearing for patients.

关键词： Caloric Test Hearing Preservation inferior vestibular nerve Superior vestibular nerve vestibular-evoked MyogenicPotential

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