الفهرس 
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Abstract
Cochlear implant is an electronic device, which produces an electrical stimulus that bypasses damaged hair cells in profound sensorineural hearing loss and directly stimulating the nerve fibers and the ganglion cells of the auditory nerve. Cochlear implant is becoming the treatment of choice for bilateral sensorineural severe and profound hearing loss.
Speech perception with cochlear implants has drastically improved to a point where patients reach near-normal levels in quiet environments. The algorithms to translate the acoustic signal into patterns of electrical stimulation the so-called speech coding strategies are one of the factors that have helped to achieve these high levels of speech perception. However, there is still need for improvement when it comes to the ability to understand speech in noise as well as music perception.
This study was accordingly designed to assess the speech performance produced by fine structure processing (FS4) strategy and high definition continuous interleaved sampling (HDCIS) strategy.
This study group consisted of twenty adults post-lingual CI users who received cochlear implantation at Kasr Al- Ainy hospitals and Wadi el Nile hospital in the period from January 2012 to January 2014.
The equipment used were 2 channel clinical audiometer equipped with a free-field connection, sound treated room, tympanometry, a laptop computer with windows 7 and Maestro v 3.0 (Med EL corporation) connected to DPI interface, to program the speech processor. Clinical programming system: Speech processor interface (PCI) and interface card (IF5). Subject’s own speech processor and HS8 headset.
The patients were selected according to our protocol of selection, then they were fitted with their cochlear implants and finally evaluated using FS4 and HDCIS strategies.
Both strategies were evaluated with speech perception tests using digits, Arabic monosyllabic PB words and Arabic spondee word test in quiet and at 0, +10 and -10 SNR. Finally patients were evaluated using a subjective questionnaire (NCIQ).
The study revealed significantly improved hearing thresholds after cochlear implantation, slight non-significant higher results of speech discrimination in quiet and +10 SNR with HDCIS strategy and slight non-significant higher results in 0 and -10 SNR with FS4 strategy and the study also showed slight non-significant improved music appreciation and telephone and TV usage with FS4 strategy.