1. Copyright © 2015 Lippincott Williams & Wilkins. Unauthorized commercial reproduction of this slide is prohibited Supplemental PowerPoint Slides Exploration of the Intraoperative Motor Evoked Potential: Assessing Cervical Cord Function and Predicting Neuromonitoring Change Ahead in Cervical Compression Myelopathy Shujie Wang, PhD Ye Tian, MD* Department of Orthopedics, Peking Union Medical College Hospital, 1 Shuai Fu Yuan, Beijing 100730, P. R. China *corresponding author: Ye Tian, MD & Professor Peking Union Medical College Hospital 1 Shuai Fu Yuan Beijing 100730 P. R. China Telephone Number: 86-13901119680 Fax Number: 86-10-69156081 Email: pumchtianye@163.com

2. Table 1

3. Figure 1 Figure 1. The exponential relationship between intraoperative MEP and preoperative mJOA score of lower extremity (n = 86). The curves were all fitted with the exponential decay 1 equation (y = A1*exp (-x/t1) + y0, fitting converge). A shows the relationship between MEP amplitude and the mJOA score (y0=-6.8, A1=5.4, t1=-1.4). B shows the relationship between MEP duration and the mJOA score (y0=19.4, A1=-18.7, t1=2.6). C shows the relationship between MEP latency and the mJOA score (y0=12.8, A1=44.3, t1=5.6).

4. Figure 2 Figure 2. The MEP parameters between the patients with or without significant MEP change. The statistical difference is appeared in MEP amplitude and latency, the high-sensitive MEP range is amplitude 36.1 ms. Statistical comparisons were made by Student’s t test (*p < 0.05).