الفهرس 
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Abstract
Cochlear implantation provides the single most effective form of hearing rehabilitation in patients with bilateral severe to profound sensorineural hearing loss that is no longer responsive to amplification, It is the most significant advance in the treatment of sensorineural hearing loss since the invention of the hearing aid (Bower and Martin 2008).
All current CI systems have reverse telemetric capabilities through which (EI and ECAP) back to the speech processor and software for clinical interpretation (Mens 2007).
Also, Mens (2007) emphasized that telemetry has become increasingly important as a way of monitoring the external and internal hardware. Telemetry has recently brought important advancements to integrity testing and it has become an essential part of cochlear implantation.
According to Cosetti et al. (2010) neural response telemetry is routinely measured at the time of implantation. This gives us information regarding the electrical output of the implant, the response of the auditory system to electrical stimulation and preliminary device programming data.
This study is conducted to see that if there will be changes in neural response telemetry postoperative compared to that measure intraoperative.