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Usefulness and Problems of Intraoperative Monitoring for Unruptured Aneurysm Surgery with the Motor Evoked Potential Tomotaka ISHIZAKI 1 , Otone ENDO 1 , Kentaro FUJII 1 , Tetsushi MATSUDAIRA 1 , Takeshi OKADA 1 , Nozomu KOBAYASHI 1 , Michiko KITAMURA 2 , Makiko SHIBATA 2 , Masaya HIGUCHI 2 , Noriko HIRANO 2 , Chinari FURUICHI 2 , Akiyo MOROTO 2 , Maki MITA 2 , Takayuki SHIMIZU 2 , Naohito YAMAMOTO 1 1Department of Neurosurgery, The Aichi Prefectural Federation of Agricultural Cooperatives for Health and Welfare Kainan Hospital 2Department of Medical Technology, The Aichi Prefectural Federation of Agricultural Cooperatives for Health and Welfare Kainan Hospital Keyword: motor evoked potential , intraoperative monitoring , aneurysm surgery pp.283-293
Published Date 2016/4/10
DOI https://doi.org/10.11477/mf.1436203274
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 It has been pointed out that the motor evoked potential(MEP)with a subdural electrode is useful in the intraoperative monitoring for unruptured aneurysm surgery. However, in some cases, we experienced postoperative ischemic complications despite evaluating the motor function via MEP monitoring. Herein, we have reported the usefulness and problems of intraoperative monitoring with MEP to evaluate brain dysfunction caused by insufficiency of cerebral blood flow.

 Out of 279 aneurysm surgery procedures, we performed MEP monitoring in 142 cases and successfully recorded in 126 cases. We compared the ischemic complication rate of the group for which MEP was monitored with that of the group for which MEP was not monitored. The whole ischemic complication rate was decreased in the group that underwent MEP monitoring. Thus, it was suggested that MEP monitoring was useful for avoiding ischemic complications.

 In internal carotid artery aneurysms, the amplitude of MEP changed and recovered in 2 cases and disappeared in one case. In anterior cerebral artery aneurysms, the amplitude of MEP changed and recovered in 2 cases. In middle cerebral artery aneurysms, the amplitude of MEP changed and recovered in 5 cases.

 We could avoid ischemic complications by intraoperative MEP monitoring in many cases. However, in some cases, we found ischemic complications that were not detected by MEP monitoring with a subdural electrode. In these cases, transcranial stimulation in combination with subdural electrode might be effective in avoiding ischemic complications that might occur after dural closure.


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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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