Krsnaa App
Correlation of cochlear nerve diameter with auditory outcome of cochlear implant surgery
Section
Neuroradiology
Case Type
Clinical Cases
Authors
Dr Madhuri Ghate, Dr Rashmi Kotkar, Dr Sagar Maheshwari & Dr Vigyat Kamal
Krsna Diagnostics PVT LTD; Pawana Nagar Housing Society 411033 Chinchwad, India; Email:madhuri.ghate01@gmail.com
Patient
2 months, male
Categories
Procedure Education ; Special Focus Seizure disorders ;
PURPOSE
To study the anatomy of Internal auditory canal. To assess the diameter of cochlear nerve (CN) in Internal auditory canal (IAC)using heavily weighted T2WI in Oblique parasagittal plane and bony cochlear nerve canal diameter using HRCT temporal bone in patients undergoing cochlear implant (CI) surgery. To assess correlation of diameter of CN with auditory outcome in post-cochlear implant surgery.
BACKGROUND
Cochlear implant is main treatment of patients with congenital bilateral sensorineural hearing loss. Implant electrode in the device stimulates CN which the sends impulse to the auditory brainstem and is interpreted as sound. Important prerequisite for CI surgery is 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 counseling of the patients.
MATERIALS AND METHODS:
RESULTS:
We found that the preoperative CN diameter of > 0.5 mm has a positive correlation with good CI outcome (CAP score 3 and more) (p-value < 0.05). In all the patients with CN diameter of < 0.5 mm; diameter of bony CN canal was < 2 mm.
CONCLUSION:
