Application Of Transcranial Electrical Facial Nerve Motor Evoked Potential Monitoring In Acoustic Neurinoma Resection

[Objectives] To explore the significance of transcranial electrical facial nerve motor evoked potential monitoring for preservation of facial nerve function in acoustic neurinoma resection.And analyze the factors influencing to protection of facial nerve in acoustic neurinoma resection.[Methods] 45 patients harboring acoustic neurinoma were treated surgically by the suboccipital retrosigmoid approach. The joint monitoring of 45 patients with electromyograohy(EMG), brainstem auditory evoked potential(BAEP), somatosensory evoked potential(SSEP). twenty-five of 45 patients were classified as experimental group of intraoperative facial nerve motor evoked potential monitoring, the rest were belonged to the control group. Facial nerve function was assessed by a modified House-Brackmann grading before the operation and after the operation. All data were analyzed by SPSS13.0 statistical software.[Results] Total removal was achieved in 41 cases(91.1%) and subtotal in 4 cases(8.9%).The facial nerve was preserved anatomically in 42 cases(93.3%).House-Brackmann grade I-II in 38 cases(84.4%). There was significant difference in the facial nerve function between the two groups after operation(P=0.023 < 0.05).[Conclusion] Transcranial electrical facial nerve motor evoked monitoring is feasible,safe for acoustic neurinoma resection. Transcranial electrical facial nerve motor evoked monitoring is preservation of facial nerve function during acoustic neurinoma resection.The texture of acoustic neurinoma was not correlated with the facial nerve function after surgery. The size of acoustic neurinoma was correlated with the facial nerve function after surgery.