Related Experiment Video
Updated: Mar 8, 2026
Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
Evaluation of S-Value in relation to cochlear anatomy in pediatric cochlear implant users
Marzouqi A Salamah1,2, Yassin Abdelsamad3,4, Bader Alwhaibi5
1Division of Otorhinolaryngology-Head and Neck Surgery, Department of Surgery, King Abdulaziz Medical City, P.O. Box 22490, 11426, Riyadh, Saudi Arabia. marzouqi.salamah@gmail.com.
Insights
The S-value, a measure of the cochlear basal turn, correlates with cochlear parameters in pediatric cochlear implant patients. This anatomical parameter shows a positive relationship with the A-value, aiding in understanding electrode placement.
Area of Science:
- Otolaryngology
- Biomedical Engineering
- Radiology
Background:
- Pediatric cochlear implantation (CI) requires precise electrode placement for optimal hearing outcomes.
- Understanding cochlear anatomy is crucial for predicting and optimizing electrode insertion depth and coverage.
- The S-value, representing the straight basal turn of the cochlea, is an anatomical parameter whose clinical significance in CI surgery is not fully elucidated.
Purpose of the Study:
- To assess the S-value in pediatric cochlear implant (CI) patients using high-resolution CT images.
- To examine the correlation between the S-value and key cochlear parameters (A- and B-values).
- To investigate the relationship between the S-value and angular insertion depth (AID) of cochlear electrodes.
Main Methods:
- Retrospective review of preoperative CT scans from pediatric CI recipients with normal cochlear anatomy.
- Measurement of cochlear parameters (A-value, B-value, cochlear duct length) and S-value using OTOPLAN software by two independent reviewers.
- Statistical analysis to evaluate correlations between S-value, A-value, B-value, and AID.
Main Results:
- A statistically significant positive correlation was found between the A-value and the S-value (r=0.65, p=0.004).
- A moderate, non-significant correlation was observed between the B-value and the S-value (r=0.43).
- A consistent negative, though not statistically significant, association was found between the S-value and angular insertion depths (r=-0.28 to -0.30).
Conclusions:
- The S-value is a reliable anatomical parameter in pediatric CI patients, demonstrating a significant positive correlation with the A-value.
- Lateral-wall electrode arrays showed consistent insertion depths despite variations in S-values among patients with similar cochlear duct lengths.
- Further research is warranted to explore the clinical impact of S-value variability on outcomes and electrode positioning in CI users.
Abstract:
To assess the S-value in pediatric cochlear implant (CI) patients using high-resolution CT images and examine its correlation with main cochlear parameters and angular insertion depth (AID). A retrospective review of preoperative CT images from pediatric CI recipients with normal cochlear anatomy was conducted at a referral hearing implant center. Cases involving congenital or acquired inner-ear abnormalities were excluded. Two independent reviewers with equivalent expertise used OTOPLAN to measure the main cochlear parameters, and the interrater reliability study revealed good agreement. S-values (the straight section of the cochlear basal turn) were measured and examined, and their correlation to electrode insertion angles and cochlear parameters (A- and B-values) was evaluated. The average cochlear duct length (CDL) of the included patients was 36.14 ± 0.26 mm, with an average S-value of 7.06 ± 0.40 mm, insertion angle of 598.20° ± 48.72°, and cochlear coverage of 77.49% ± 0.57. A statistically significant relationship was found between A- and the S-values (r = 0.65, p = 0.004). However, the B-value showed a moderate, non-significant correlation with the S-value (r = 0.43). Furthermore, a consistent negative, but not statistically significant, association was found between the S-value and the angular insertion depths of all electrode contacts (r = - 0.28 to - 0.30). The S-value is a dependable anatomical parameter that correlates positively with the A-value. The evaluated lateral-wall array showed consistent insertion depths among patients with similar CDL, even when S-values differed. Further studies are needed to investigate the impact of greater variability in S-values on clinical outcomes and electrode-array position among CI users.
More Related Videos
03:58Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
Published on: January 17, 2025
07:00Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
Published on: June 21, 2024
