The Evaluation Of The Neural Function Of CMAP In Acoustic Neuroma Surgury

Objective:As clinical microsurgical techniques and intraoperative neural electrophysiological detection technology development,the anatomical retention of facial nerve is significantly improved,Because of intraoperative nerve function assessment plays an important role in guiding the performer,it is important for patients with postoperative facial nerve recovery.We used evoked electromyogram(CMAP)in the microsurgery of acoustic neuroma to study the role of CMAP in the protection of facial nerve function and prognosis.The postoperative facial nerve function was evaluated by different stimulation thresholds for postoperative stimulation.Method:We screened 38 cases of acoustic neuroma(postoperative pathology confirmed)in the Second Hospital of Hebei Medical University from December 2015 to October 2017.Pre-op,and post-op facial nerve function with the House-Brackmann classification.Select facial nerve function(H-B?-?)patients;All the patients were treated with a retrosig-moid sinus approach to resection of the tumor.Using disposable nerve probes to stimulate the brain stem of the facial nerve after surgery,Start from the minimum stimulus(0.03mA)until Induce the CMAP,The minimum stimulus CMAP is produced as a stimulus threshold.The patients were evaluated for facial nerve function in 1 day,3 days,1 week,1 month and 3 months after surgery.A retrospective study was conducted to analyze the relationship between the threshold value of evoked electromyogram and postoperative facial nerve function.Results: 38 cases of acoustic neuroma,tumor cut all 35 cases(92.1%),the complete 3 cases(7.9%),3 months postoperative facial nerve function,the excellent rate of House Braekmann classification(H.B I-II)is 84.2%.Conclusion: Neuroelectrophysiological techniques can evaluate the post-operative facial nerve function of patients with acoustic neuroma.