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J Audiol Otol > Epub ahead of print
DOI: https://doi.org/10.7874/jao.2018.00430    [Epub ahead of print] Published online March 13, 2019.
Feasibility of Revision Cochlear Implant Surgery for Better Speech Comprehension
Kyurin Hwang1, Jae Yong Lee1, Hyeon Seok Oh1, Byung Don Lee1, Jinsei Jung2, Jae Young Choi2
1Department of Otorhinolaryngology-Head and Neck Surgery, Soonchunhyang University College of Medicine, Seoul, Korea
2Department of Otorhinolaryngology-Head and Neck Surgery, Yonsei University College of Medicine, Seoul, Korea
Correspondence  Jae Young Choi ,Tel: +82-2-2228-3622, Fax: +82-2-393-0580, Email: jychoi@yuhs.ac
Submitted: September 21, 2018  Accepted after revision: November 22, 2018
Background and Objectives
The purpose of this study was to evaluate the efficacy of revision cochlear implant (CI) surgery for better speech comprehension targeting patients with low satisfaction after first CI surgery.
Subjects and Methods
Eight patients who could not upgrade speech processors because of an too early CI model and who wanted to change the whole system were included. After revision CI surgery, we compared speech comprehension before and after revision CI surgery. Categoies of Auditory Performance (CAP) score, vowel and consonant confusion test, Ling 6 sounds, word and sentence identification test were done.
The interval between surgeries ranged from eight years to 19 years. Same manufacturer’s latest product was used for revision surgery in six cases of eight cases. Full insertion of electrode was possible in most of cases (seven of eight). CAP score (p-value=0.01), vowel confusion test (p-value=0.041), one syllable word identification test (p-value=0.026), two syllable identification test (p-value=0.028), sentence identification test (pvalue=0.028) had significant improvement. Consonant confusion test (p-value=0.063), Ling 6 sound test (p-value=0.066) had improvement but it is not significant.
Although there are some limitations of our study design, we could identify the effect of revision (upgrade) CI surgery indirectly. So we concluded that if patient complain low functional gain or low satisfaction after first CI surgery, revision (device upgrade) CI surgery is meaningful even if there is no device failure.
Keywords: Cochlear implant · Revision surgery · Speech · Comprehension
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