Krsnaa App
Correlation of cochlear nerve diameter with Auditory outcome of cochlear implant surgery.
Congress:
ECR 2020
Poster Number:
C-08810
Type:
Scientific Exhibit
Keywords:
Head and Neck, Ear / Nose / Throat, CT, MR, Surgery, Education and training, Prospective, Cross-sectional study, Multicentre study
Authors
Dr M.S. Ghate, Dr R.R. Kotkar, Dr S. Maheshwari & Dr V. Kamal
Krsna Diagnostics PVT LTD; Pawana Nagar Housing Society 411033 Chinchwad, India; Email:madhuri.ghate01@gmail.com
FIGURE 1
Axial MRI BRAIN T1W image
Axial T1W MRI image shows left cerebellar hypoplasia (arrow).
Purpose
To study the anatomy of Internal auditory canal (IAC) To assess diameter of cochlear nerve(CN) in IAC using heavily weighted T2 sequence in Oblique parasagittal plane and bony CN canal(BCNC) diameter using HRCT temporal bone in patients undergoing cochlear implant(CI) surgery. To assess correlation of diameter of CN with auditory outcome in post-CI surgery
Methods and materials
The cochlear implant is the main treatment of patients with congenital bilateral sensorineural hearing loss. Implant electrode in the device stimulates CN which then sends an impulse to the auditory brainstem and is interpreted as sound. An important prerequisite for CI surgery is an intact CN. Imaging with HRCT and High-resolution MR helps in assessing the congenital abnormalities associated with the inner ear and CN. It can also help in surgical planning for CI wrt choosing the side of the ear for CI and preoperative...
Results
Out of 25 patients, 15 patients showed a CAP Score of 3 and more than 3 and 10 patients showed a CAP score of less than 3. In all the patients with CN diameter of <0.5mm; diameter of bony CN canal was <2mm By using linear regression analysis We found that the preoperative CN diameter of >0.5mm has a positive correlation with good CI outcome (CAP score 3 & more) (p-value < 0.05). In all the patients with CN diameter of <0.5mm; diameter of bony CN canal was <2mm
CONCLUSION:
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FIGURE 2
Sagittal MRI BRAIN T1W image
T1W sagittal MRI image shows left cerebellar hypoplasia.
FIGURE 3
MRI BRAIN Coronal T2W image
T2W coronal MRI image shows left cerebellar hypoplasia (arrow).
FIGURE 4
MRI BRAIN Coronal 3D SPGR image
3D SPGR coronal MRI image shows left cerebellar hypoplasia (arrow).
