Radiological Classification of the Facial Nerve

NCT ID: NCT02925208

Last Updated: 2016-10-06

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 140 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2010-01-31
• Study Completion Date: 2016-10-31

Brief Summary

Cortical mastoidectomy and posterior tympanotomy is a classic approach for cochlear implant. Intimate knowledge of the relevant surgical anatomy of the temporal bone and facial recess is important to safely perform the posterior tympanotomy. Anatomical variation of facial nerve such as lateral or anterior position of vertical segment of facial nerve, will render this approach challenging. In this research, investigators proposed a Radiological Classification system of the position of vertical segment of facial nerve in relation to the lateral semicircular canal to predict difficult cases with narrow facial recess.

Detailed Description

Cochlear implantation done by mastoidectomy, posterior tympanotomy and round window membrane insertion or cochleostomy, if we have to. In cases with very laterally placed vertical segment of the facial nerve a trans- mastoid trans- attic approach used with trans canal monitoring as an alternative approach. Position of the vertical segment of the facial nerve (VFN) determined by coronal view HRCT of temporal bone, bone window of 0.6 mm thickness by using the cut posterior to the internal auditory canal at the level of lateral semicircular canal (LSCC) and then drawing a line parallel to the bony canal of the VFN and another parallel line on the outer bony wall of lateral semicircular canal (LSCC), and comparing level of both. The location of the facial nerve classified into normal if the FN is medial, same level or lateral to LSCC . Investigators referred the laterally placed FN (LPFN) when the whole vertical segment of facial nerve is lateral to LSCC. In addition, distance between VFN and LSCC was measured in cases of laterally placed FN.

Investigators proposed a radiological classification system of the mastoid segment of facial nerve to predict round window niche accessibility through posterior tympanotomy pre-operatively by using coronal view computed tomography scan of temporal bone. Facial nerve position classified into 3 types in relation to LSCC:

1. TYPE I Medial to LSCC

2. TYPE II Same level of LSCC

3. TYPE III Laterally placed to LSCC III a) Less than 2mm III b) More than 2mm

Conditions

Severe to Profound Sensorineural Hearing Loss; Undergoing Cochlear Implant Surgery

Study Design

• Study Time Perspective: RETROSPECTIVE

Study Groups

Cochlear Implant

Patients with severe to profound sensorineural hearing loss who underwent cochlear implant surgery

cochlear implant surgery

Intervention Type: OTHER

patients with severe to profound sensorineural hearing loss who underwent cochlear implant surgery

Interventions

cochlear implant surgery

patients with severe to profound sensorineural hearing loss who underwent cochlear implant surgery

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• All patient who underwent cochlear implant surgery with preoperative computed tomography scan and high resolution CT scan of temporal bone

Exclusion Criteria

• None

• Minimum Eligible Age: 1 Year
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Imam Abdulrahman Bin Faisal University

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Laila M Al Telmesani, MD

Role: PRINCIPAL_INVESTIGATOR

ENTDepartment, Dammam University, Dammam, Saudi Arabia

Locations

Dammam University KFHU

Khobar, EP, Saudi Arabia

Countries

Saudi Arabia

Other Identifiers

ENT_1_10_2016

Identifier Type: -

Identifier Source: org_study_id