Analysis of the developmental trajectory and influencing factors of auditory and speech functions after cochlear implantation in Mandarin Chinese speaking children.

Background: The auditory and speech development of the children with cochlear implants (CIs) are influenced by many factors. Objective: To study the developmental trajectory and influencing factors of auditory and speech functions for the Mandarin Chinese speaking children with CIs. Material and methods: The children with CIs undergoing rehabilitation in the same institution from June 2016 to June 2019 were followed up. Their closed monosyllables and disyllables recognition rate, closed average language age, categories of auditory performance (CAP) and speech intelligibility rating (SIR) were evaluated at 0, 1, 3, 6, 12 and 24 months of rehabilitation. The results were analyzed by SPSS 23.0. Results: 49 children were followed up for 1 year, 29 children for 2 years. The evaluated indicators of auditory and speech functions were improved with the prolongation of rehabilitation and influenced by the age of cochlear implantation, the use of hearing aids before surgery, guardian's educational degree, the relationship between guardian and child. Conclusions and significance: The auditory and speech functions of the children with CIs were improved significantly with the prolongation of rehabilitation and influenced by many factors, which can help us to predict the effect of CI more accurately and develop an individualized rehabilitation program.