الفهرس 
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Abstract
he cochlear implantation has become an effective treatment or even a miraculous treatment for postlingually deafened subjects and for prelingually deaf children with bilateral profound sensorineural hearing loss.Cochlear implant can provide the opportunity for children born deaf or deafened early in life to use speech as their primary means of communication.
Cochlear implants stimulate the auditory nerve electrically to allow hearing in individuals with sensorineural deafness. The appropriate range of implant stimulation is guided by various auditory evoked responses that can be measured during cochlear implant surgery and postoperatively. Intraoperative measurements are generally favored in children because they eliminate the need for patient cooperation.
These auditory evoked responses includes The intraoperative electrically evoked stapedius reflex threshold (ESRT) and evoked compound action potential (ECAP),where ESRT, an autonomic reflex that protects the ear from the effects of loud noise, is evoked electrically during cochlear implantation to determine the loudest sound that can be tolerated without causing discomfort (the maximum comfort level, MCL). A MCL set too high causes discomfort that may adversely affect the child’s ability to adapt to the cochlear implant. And ECAP is used to determine the hear