Journal
ACTA OTO-LARYNGOLOGICA
Volume 138, Issue 4, Pages 375-381Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00016489.2017.1404639
Keywords
Cochlear implants; cone-beam computed tomography; cochlear duct; implanted electrode
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Funding
- National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [NRF-2015R1C1A1A02036457]
- National Research Foundation of Korea (NRF) - Korean Government [NRF-2015R1C1A2A01055438]
- Ajou University School of Medicine
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Objective: To assess the usefulness of cone beam computed tomography (CBCT) for characterizing electrode insertion and evaluate the influence of electrode insertion status on post-cochlear implantation (CI) outcomes. Design: Twenty-six ears with post-CI CBCT scans were included. The devices were MED-EL Flex28 (n = 21) and Nucleus slim straight (n = 5). The parameters including cochlear duct length (CDL), insertion depth angle (IDA), insertion length of electrode (IL), and cochlear coverage (CC) were analyzed and compared with aided pure-tone threshold (PTA) with implant in free field, and open-set sentence score. Results: The mean CDL was 36.8 +/- 1.4 mm. Electrode array was dislocated into scala tympani in two ears. The mean IL and IDA were 26.5 +/- 1.9 mm and 541.4 +/- 70.2 degrees. The mean linear CC (IL/CDL, 0.73 +/- 0.06) was larger than the mean angular CC (IDA/900, 0.60 +/- 0.08). The CBCT parameters showed correlation one another. While the aided pure-tone threshold was correlated with IL and IDA, there were no significant correlations in the open-set sentence score. For the postlingually deaf patients with single electrode (Flex 28), the sentence score had no significant correlation and the aided PTA was positively correlated with IL (R = 0.517, p = .028). Conclusions: This study validated the CBCT evaluating the electrode array position. The CBCT could be helpful for the preoperative selection of the optimal array and prediction of the CC.
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