title: Influencing Factors Analysis of Facial Nerve Function after the Microsurgical Resection of Acoustic Neuroma.
abstract: OBJECTIVE
  To explore and analyze the influencing factors of facial nerve function retainment after microsurgery resection of acoustic neurinoma.
  
  
  METHODS
  Retrospective analysis of our hospital 105 acoustic neuroma cases from October, 2006 to January 2012, in the group all patients were treated with suboccipital sigmoid sinus approach to acoustic neuroma microsurgery resection. We adopted researching individual patient data, outpatient review and telephone followed up and the House-Brackmann grading system to evaluate and analyze the facial nerve function.
  
  
  RESULTS
  Among 105 patients in this study group, complete surgical resection rate was 80.9% (85/105), subtotal resection rate was 14.3% (15/105), and partial resection rate 4.8% (5/105). The rate of facial nerve retainment on neuroanatomy was 95.3% (100/105) and the mortality rate was 2.1% (2/105). Facial nerve function when the patient is discharged from the hospital, also known as immediate facial nerve function which was graded in House-Brackmann: excellent facial nerve function (House-Brackmann I-II level) cases accounted for 75.2% (79/105), facial nerve function III-IV level cases accounted for 22.9% (24/105), and V-VI cases accounted for 1.9% (2/105). Patients were followed up for more than one year, with excellent facial nerve function retention rate (H-B I-II level) was 74.4% (58/78).
  
  
  CONCLUSIONS
  Acoustic neuroma patients after surgery, the long-term (≥1 year) facial nerve function excellent retaining rate was closely related with surgical proficiency, post-operative immediate facial nerve function, diameter of tumor and whether to use electrophysiological monitoring techniques; while there was no significant correlation with the patient's age, surgical approach, whether to stripping the internal auditory canal, whether there was cystic degeneration, tumor recurrence, whether to merge with obstructive hydrocephalus and the length of the duration of symptoms.
authors.affiliation: Department of Neurosuregery, First Affliated Hospital, AnHui Medical Univesity, Hefei, China.
authors.forename: WenMing
authors.initials: W
authors.lastname: Hong
authors.affiliation: Department of Neurosuregery, First Affliated Hospital, AnHui Medical Univesity, Hefei, China.
authors.forename: HongWei
authors.initials: H
authors.lastname: Cheng
authors.affiliation: Department of Pathology, First Affliated Hospital, AnHui Medical Univesity, Hefei, China.
authors.forename: XiaoJie
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Neurosuregery, First Affliated Hospital, AnHui Medical Univesity, Hefei, China.
authors.forename: ChunGuo
authors.initials: C
authors.lastname: Feng
keywords: Acoustic neuroma; Electrophysiological monitoring; Facial nerve function; Internal acoustic meatus; Keyhole; Sigmoid sinus approach