Abstract:【Objective】To investigate the changes of intraoperative neuroelectrophysiological monitoring (IONM) indexes, motor evoked potentials (MEPs) and somatosensory evoked potentials (SEPs) in patients with cervical spondylotic myelopathy (CSM) with abnormal MRI signals, and to analyze the relationship between abnormal MRI signals and IONM changes.【Methods】The clinical and IONM data of 150 CSM patients with abnormal MRI signals from January 2019 to January 2021 were collected and divided into two groups according to their signal characteristics. Group A: T2WIs high signal (120 cases); Group B: T2WIs high signal and T1WIs low signal (30 cases). The IONM data of important surgical nodes were recorded. 【Results】 Group A: 9 cases had IONM changes, 1 case had temporary nerve injury, and there was no new permanent nerve injury; Group B: 18 cases of IONM changes, 5 cases of temporary nerve injury and 2 cases of new permanent nerve injury. There was significant difference in IONM between the two groups (MEPs, 5/120 vs 12/30,P<0.05; SEPs, 4/120 vs 6/30,P<0.05). In addition, there was significant difference in IONM amplitude before and after decompression in the group B [MEPs,(134±30.2) μV vs (65±26.2) μV, P<0.05;SEPs, (2.4±0.9) μV vs (1.3±0.7) μV, P<0.05].【Conclusion】In CSM patients, high T2WIs signal and low T1WIs signal are more prone to IONM changes than high T2WIs signal alone, resulting in nerve injury. In the process of CSM spinal cord decompression, we should pay attention to the changes of IONM, and take appropriate surgical intervention measures when necessary.
林向全, 郑忠, 林勤, 李超雄. 髓内MRI信号异常的脊髓型颈椎病患者术中神经电生理的变化及其意义[J]. 医学临床研究, 2022, 39(3): 328-331.
LIN Xiang-quan, ZHENG Zhong, LIN Qin, et al. Changes and Significance of Intraoperative Neurophysiology in Patients with Cervical Spondylotic Myelopathy with Abnormal Intramedullary MRI Signal. JOURNAL OF CLINICAL RESEARCH, 2022, 39(3): 328-331.
[1] FUNABA M, KANCHIKU T, YOSHIDA G, et al. Efficacy of intraoperative neuromonitoring using transcranial motor-evoked potentials for degenerative cervical myelopathy: a prospective multicenter study by the monitoring committee of the japanese society for spine surgery and related research[J].Spine,2022, 47(1): E27-E37. [2] WANG S, ZHANG J, TIAN Y, et al. Intraoperative motor evoked potential monitoring to patients with preoperative spinal deficits: judging its feasibility and analyzing the significance of rapid signal loss [J].Spine J, 2017, 17(6): 777-783. [3] WANG S, TIAN Y, WANG C, et al. Prognostic value of intraoperative MEP signal improvement during surgical treatment of cervical compressive myelopathy [J].Eur Spine J,2016, 25(6): 1875-1880. [4] NOURI A, TETREAULT L, ZAMORANO J J, et al. Role of magnetic resonance imaging in predicting surgical outcome in patients with cervical spondylotic myelopathy [J].Spine,2015, 40(3): 171-178. [5] TAKAHASHI J, HIRABAYASHI H, HASHIDATE H, et al. Assessment of cervical myelopathy using transcranial magnetic stimulation and prediction of prognosis after laminoplasty [J].Spine,2008, 33(1): E15-E20. [6] WADA E, YONENOBU K, SUZUKI S, et al. Can intramedullary signal change on magnetic resonance imaging predict surgical outcome in cervical spondylotic myelopathy? [J].Spine,1999, 24(5): 455-461. [7] MORIO Y, TESHIMA R, NAGASHIMA H, et al. Correlation between operative outcomes of cervical compression myelopathy and MRI of the spinal cord [J].Spine,2001, 26(11): 1238-1245. [8] PARKE W W. Correlative anatomy of cervical spondylotic myelopathy [J].Spine,1988, 13(7): 831-837. [9] AL-MEFTY O, HARKEY L H, MIDDLETON T H, et al. Myelopathic cervical spondylotic lesions demonstrated by magnetic resonance imaging [J].J Neurosurg,1988, 68(2): 217-222. [10] TETREAULT L A, DETTORI J R, WILSON J R, et al. Systematic review of magnetic resonance imaging characteristics that affect treatment decision making and predict clinical outcome in patients with cervical spondylotic myelopathy [J].Spine,2013, 38(22): S89-S110. [11] ZHANG J T, MENG F T, WANG S, et al. Predictors of surgical outcome in cervical spondylotic myelopathy: focusing on the quantitative signal intensity [J].Eur Spine J,2015, 24(12): 2941-2945.