Limitation of High Pitch Sound Perception in Nontumor Patients with Auditory Brainstem Implantation.
10.3342/kjorl-hns.2017.00444
- Author:
Hyun Seung CHOI
1
;
Jae Young CHOI
;
In Seok MOON
;
Mi Ran BAE
;
Bo Gyung KIM
;
Minbum KIM
;
Jin Woo CHANG
;
Junhui JEONG
Author Information
1. Department of Otorhinolaryngology, National Health Insurance Service Ilsan Hospital, Goyang, Korea. jeongj@nhimc.or.kr
- Publication Type:Original Article
- Keywords:
Auditory brainstem implantation;
Cochlear ossification;
Narrow internal auditory canal;
Nontumor;
Outcomes
- MeSH:
Adult;
Auditory Brain Stem Implantation*;
Auditory Brain Stem Implants*;
Cochlea;
Cochlear Implantation;
Cochlear Implants;
Electric Impedance;
Electrodes;
Hearing;
Humans;
Methods;
Rehabilitation
- From:Korean Journal of Otolaryngology - Head and Neck Surgery
2018;61(5):235-241
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND AND OBJECTIVES: Auditory brainstem implantation (ABI) is another option for hearing rehabilitation in non-neurofibromatosis type 2 patients who cannot undergo cochlear implantation (CI). However, the average performance of ABI is worse than that of CI. We analyzed the psycho-electrical parameters of each electrode and psycho-acoustic response to different frequency sounds in nontumor patients with ABI. SUBJECTS AND METHOD: Sixteen patients with ABI from July 2008 to May 2013 were included in the study. They were followed up for 4 to 56 months. Among them, 12 were prelingual deaf with a narrow internal auditory canal or cochlear ossification. The remaining four were post-lingual deaf adults with severely ossified cochleae. We analyzed the electrical parameters [impedance, threshold level (T level), and dynamic range] of each of the 12 electrodes. We also evaluated the sound field pure-tone threshold, Ling 6 sound detection-identification test (Ling 6 test), and pitch ranking data of these patients. RESULTS: The impedance, T level, and dynamic range did not significantly differ among electrodes. However, the pure-tone threshold to sound field stimulation was elevated in the high tone area, where more variables were found than in the low frequency area. Patients could not identify /S/ and /Sh/ sounds in the Ling 6 test. The mean T level and the dynamic range of the three highest pitch-perceiving electrodes in each patient was higher and narrower, respectively, than those of the three lowest pitch-perceiving electrodes. CONCLUSION: The nontumor patients with ABI have difficulty perceiving high pitch sound. More sophisticated penetrating type electrodes and, if possible, bimodal stimulation with CI, could be considered.
