Korean J Otorhinolaryngol-Head Neck Surg.
2018 May;61(5):235-241. 10.3342/kjorl-hns.2017.00444.
Limitation of High Pitch Sound Perception in Nontumor Patients with Auditory Brainstem Implantation
- Affiliations
-
- 1Department of Otorhinolaryngology, National Health Insurance Service Ilsan Hospital, Goyang, Korea. jeongj@nhimc.or.kr
- 2Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea.
- 3Department of Otorhinolaryngology-Head and Neck Surgery, Soonchunhyang University College of Medicine, Bucheon, Korea.
- 4Department of Otorhinolaryngology-Head and Neck Surgery, Catholic Kwandong University College of Medicine, Incheon, Korea.
- 5Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea.
- KMID: 2436461
- DOI: http://doi.org/10.3342/kjorl-hns.2017.00444
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.
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