The Effect of Cochlear Implantation and Relevant Factors on Residual Hearing
|Keywords||cochlear implantation residual hearing pure-tone audiometry|
Objective:To study the influence of the cochlear implantation on residual hearing in different frequencies. And analysis influential factors to residual hearing after cochlear implantation.Methods:Pre-implant and post-implant audiometric evaluation were done for 9 unilateral cochlear recipients. They were well-cooperating with audiometry, with nornlal inner and middle ears, and without obvious surgical complicationsResults:Nonparametric statistics:residual hearing of the implanted ears has statistic significance in different frequencies especially in 250 Hz, 500 Hz and 1 KHz, loss 15,17,8dB HL, respectively. After operation the thresholds of bilateral ears have statistic significance in 4 KHz、8KHz. No statistically significant difference was found in the residual hearing between straight and perimodiolar implants.Conclusion:Different frequencies have different damage to the residual hearing, especially in 1KHz. This phenomenon may be related to structure and function of inner ear damaged during electrode implantation process and widespread inflammation after the cochlear implantation.