High-resolution computed tomography (HRCT) magnifies the role of preoperative imaging for detailed inner and middle ear anatomical information and enhances more efforts for better dependent correlation and measurements of round window (RW). Objectives: The aim of this study was to find an appropriate way by HRCT imaging for the prediction of the visibility of the round window during cochlear implant (CI) surgery. Methods: The study was conducted using hospital information from patients referring the Khuzestan Cochlear Implant Center (2017)(2018). 87 patients underwent cochlear implant surgery, 56 patients with high resolution CT scans were included in the study. All patients underwent surgical treatment via posterior tympanotomy approach. Results: 56 patients were examined. Patients were divided into three groups: children (0-12 years) and adolescence (18-13 years) and adults (19-59 years), of whom 45 patients (80.4%) were children, and 3 patients were adolescence (5.4%) and 8 patients (14.3%) were adults. 22 patients (39.3%) were fully visible and 13 patients (23.2%) were partially visible and 21 (37.5%) patients were difficult to visualize. In high-resolution imaging studies, mastoid 2 cases (3.6%) were poorly aerated and 8 cases (14.3%) were moderately aerated and 46 (86.1%) were well aerated. The amount of round window overhanging in 43 patients (76.8%) was 4.4 and in 12 patients (21.4%) was 3.4%. Conclusion:The presence of the air cell around the facial recess may provide easier access to the facial recess. There was a significant relationship between the RW in the operation and the angle between the RW and the facial nerve and the coronal axis. There is no significant relationship between the visibility of the RW and the facial recess, Vertical height RW and facial nerve (FN), the distance between the FN and the posterior canal in the axial, the angle between the FN and inner margin of RW, and the angle between the FN and the tympanic annulus with the inner margin RW in the Axial and FRL was not found.

Background and Objective: Age of cochlear implantation (CI) is an important factor for restoring normal auditory processing and different language skills so that early diagnosis of hearing loss significantly influences the rate of developmental skills in these children. The present study aimed to investigate different factors affecting the age of hearing loss diagnosis and CI in children with hearing loss. Methods: This was a descriptive cross-sectional trial conducted on the children with hearing loss that underwent CI (n=252) in the Khuzestan Cochlear Implant center, Ahvaz, Iran during 2012 to 2015. The demographic data of children and parents, age of diagnosis, application of hearing aid, and rehabilitation therapy were collected through a questionnaire during the regular visits of the patients. The data were analyzed using statistical package SPSS (Windows, version 18).The normality of data and homogeneity of variances were evaluated through Kolmogorov-Smirnov and Leven tests, respectively. Then, T-test was used to evaluate the statistically significance of the difference and Pearson correlation coefficient to determine the relationship between the quantitative variables. Results: The mean age of diagnosis was 10.7 months (range 0.1 to 60 months). Of 252 patients, 131 (52%) were male and 121 (48%) were female (p=0.98) and 123 patients (50.2%) had a positive family history of hearing loss or deafness (p<0.0001). In addition, 17 patients (6.9%) had a favorable economic status, while 96 (38.9%) had a moderate and 134 (53.2%) a low economic status. Interestingly, 78.8% of the deaf children were from parents of consanguineous marriages, and 12.2% from non-consanguineous unions. Of the six studied variables, only family history and family relationship variables showed significant relationship with age of diagnosis of hearing loss. Conclusion: Providing comprehensive basic information and increased awareness may help all parents, even those with low socioeconomic status and educational level, to detect hearing loss in their newborns as early as possible. This approach could prevent the consequent adverse effects of hearing loss on psychological, social, and social dimensions as well as on educational achievement in childhood.

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