The Impact of Bispectral Index Monitoring on Outcomes in Spinal Cord Stimulation for Chronic Disorders of Consciousness

Xuanling Chen,1,&ast; Xuewei Qin,1,&ast; Yutong Zhuang,2 Zhengqian Li,3 Zhenhu Liang,4 Hua Zhang,5 Lan Yao,1 Xiaoli Li,6 Jianghong He,7 Xiangyang Guo3 1Department of Anesthesiology, Peking University International Hospital, Beijing, People’s Republic of China; 2Department of Neurosurgery, The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong, People’s Republic of China; 3Department of Anesthesiology, Peking University Third Hospital, Beijing, People’s Republic of China; 4Institute of Electrical Engineering, Yanshan University, Qinhuangdao, People’s Republic of China; 5Clinical Epidemiology Research Center, Peking University Third Hospital, Beijing, People’s Republic of China; 6The State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing, People’s Republic of China; 7Department of Neurosurgery, Tiantan Hospital, Capital Medical University, Beijing, People’s Republic of China&ast;These authors contributed equally to this workCorrespondence: Xiangyang Guo, Peking University, Third Hospital, 49 huayuan North Road, Haidian District, Beijing, 100191, People’s Republic of China, Email [email protected] Jianghong He, Beijing Tiantan Hospital, 119 South Fourth Ring Road West, Fengtai District, Beijing, 100069, People’s Republic of China, Email [email protected]: To observe whether maintaining the appropriate depth of anesthesia with Bispectral Index (BIS) can improve the prognosis of Spinal Cord stimulation (SCS) implantation in patients with chronic Disorders of consciousness (DoC).Methods: 103 patients with DoC undergoing SCS implantation were reviewed, and 83 patients with DoC were included according to the standard of inclusion and exclusion Criteria. Patients were divided into a BIS group (n =45) and a non-BIS group (n =38) according to whether BIS monitoring was used during the operation. The depth of anesthesia in the BIS group was maintained between 40– 60. The anesthesiologist adjusted the depth of anesthesia in the non-BIS group according to clinical experience. Relevant information such as disease course, cause, anesthesia time, and operation time were collected. Preoperative CRS-R(preoperative) score, postoperative CRS-R(24h), and postoperative CRS-R(3m) changes were collected.Results: The CRS-R(3m) score in the BIS group was higher than that in the non-BIS group (preoperative), and the difference was statistically significant (P < 0.05). In CRS-R (24h), the BIS group was higher than the non-BIS group, and the difference was statistically significant (X2=8.787, P =0.004). The improvement of consciousness was included in the multivariate Logistic regression analysis model, and it was found that the thalamus was an independent factor affecting the improvement of consciousness (P < 0.05). During follow-up, 1 patient in the BIS group had a decrease in consciousness from MCS− to VS/ UWS and 2 patients in the non-BIS group died during follow-up.Conclusion: Patients can be benefit in hearing in CRS-R (24h). We recommend the use of BIS to monitor the depth of anesthesia in patients with DoC to improve patient outcomes.Keywords: chronic disturbance of consciousness, vegetative state/unresponsive wakefulness syndrome, spinal cord stimulation, general anesthesia, bispectral index, improved coma recovery scale