诱发电位在Arnold-Chiari畸形合并脊髓空洞症中的应用

Study on evoked potential of Arnold-Chiari malformation with syringomyelia

目的：探讨体感诱发电位（SEP）、运动诱发电位（MEP）与脑干听觉诱发电位（BAEP）在阿-基畸形（Arnold—Chiari malformation，ACM）合并脊髓空洞症（SM）手术疗效判定中的作用。方法：对ACM—SM患者行术前、术后上下肢SEP、MEP及BAEP检查，对比分析术前术后潜伏期、波幅及传导时间。结果：58例ACMSM患者，术前40例SEP异常，46例MEP异常，28例BAEP结果异常，表现为潜伏期延长、波幅降低及MEP的中枢传导时间（CMCT）延长。行后颅窝减压术＋硬脑膜扩大成形术＋后颅窝重建术后患者症状改善，复查MRI示小脑扁桃体回缩、空洞缩小；39例SEP、45例MEP及27例BAEP潜伏期、CMCT延长与波幅降低均有不同程度改善，SEP、MEP、BAEP分别各有1例与术前比较无明显改变。结论：SEP、MEP、BAEP可以作为评价ACM—sM手术前后效果判定的客观指标。

Objective： To study somatosensory evoked potential （SEP）, motor evoked potential （MEP） and auditory brain-stem evoked potential （BAEP）on Arnold-Chiari malformation （ACM） with syringomyelia（SM）. Methods： SEP,MEP and BAEP were performed before and after the operation in 58 patients, with comparative analysis of the results of latency,amplitude and conduction time of SEP,MEP and BAEP. Results：Before opretion,40 cases were abnormal in SEP,46 cases were abnormal in MEP and 28 cases were abnormal in BAEP ,and the abnormal patterns were mainly shown in the delay of latency and lower amplitude and in the delay of motor conduction time（CMCT）. But the end of posterior fossa de compression and cerebral dura mate piasty and posterior fossa reconstruction, the symptoms of patients were improved,and syrinx was reduced in MRI check. The results of latency, amplitude and conduction rime in 39 cases＇s SEP,45 cases＇MEP and 27 cases＇BAEP were improved,3 cases did not show SEP, MEP and ABR change after operation. Conclusion： SEP, MEP and BAEP can serve as the index for the effects of ACM-SM befor and after operation.