• Zhibao Li, Xing Fan, Mingran Wang, Xiaorong Tao, Lei Qi, Miao Ling, Dongze Guo, and Hui Qiao.
• Department of Neurophysiology, Beijing Neurosurgical Institute, Capital Medical University, Beijing, China; Beijing Tiantan Hospital, Capital Medical University, Beijing, China.
• Clin Neurophysiol. 2019 May 1; 130 (5): 707-713.

ObjectiveThe study aimed to investigate the predictive value of motor evoked potential (MEP) deterioration duration for postoperative motor deficits in patients undergoing intracranial aneurysm surgery.MethodsData from 587 patients were reviewed and 92 patients with MEP deterioration were enrolled. MEP deterioration duration was compared between patients with and without postoperative motor deficits. Receiver operating characteristic (ROC) curve analysis was performed to define the threshold value for predicting postoperative motor deficit risk. Additionally, the association between MEP deterioration duration and postoperative CT findings was explored.ResultsPatients with postoperative motor deficits had a significantly longer MEP deterioration duration (p < 0.01). An MEP deterioration duration greater than or equal to 13 min was identified as an independent predictor of immediate (p < 0.01), short-term (p < 0.01), and long-term postoperative motor deficits (p < 0.05). There was no significant association between MEP deterioration duration and new CT abnormalities.ConclusionMEP deterioration duration could be used for predicting intracranial aneurysm surgical outcome.SignificanceThe study first proposed a threshold value of MEP deterioration duration (13 min) for predicting the risk of postoperative motor deficits in patients undergoing intracranial aneurysm surgery.Copyright © 2019. Published by Elsevier B.V.

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