Facial nerve stimulation in the narrow bony cochlear nerve canal after cochlear implantation

Yoon Chan Rah, Young Sun Yoon, Moon Young Chang, Ji Young Lee, Myung Whan Suh, Jun Ho Lee, Seung Ha Oh, Sun O. Chang, Moo Kyun Park

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Objectives/Hypothesis To evaluate the correlation between a narrow bony cochlear nerve canal (BCNC) and facial nerve stimulation (FNS) after cochlear implantation (CI) and their underlying mechanisms and to predict the risk of FNS preoperatively. Study Design Retrospective cohort study. Methods A total of 64 pediatric cases that underwent CI were included. Among them, 32 cases experienced FNS after CI, and another 32 cases were selected from 817 pediatric implantees by stratified random sampling. The width of the BCNC, the status of the cochlear nerve (CN) and the internal auditory canal (IAC), T level, and C level were compared and analyzed. Strategies for eliminating FNS were also analyzed. Results The FNS group showed a narrower BCNC (1.09 ± 0.52 mm) than the control group (1.99 ± 0.61 mm; P <.01), a lower CN/facial nerve ratio (0.32 ± 0.36) than the control group (1.34 ± 0.76; P <.01), and narrower IAC diameter (4.06 ± 1.71 mm) than the control group (5.66 ± 1.36 mm; P <.01). The FNS group also showed higher T level (165.7 ± 28.3 μA) than the control group (142.2 ± 21.2 μA; P <.01). Adjustment of the C levels and/or pulse width and switching off offending electrodes were attempted to eliminate FNS, with a 75.0% success rate. The FNS group still showed low Categories of Auditory Performance scores (3.00 ± 1.90) compared with the control group (5.94 ± 1.41, P <.01) after adjustment. Conclusions A narrow BCNC could be a cause of FNS after CI. Therefore, careful selection of the side for CI and programming strategies are required to reduce FNS.

Original languageEnglish
Pages (from-to)1433-1439
Number of pages7
JournalLaryngoscope
Volume126
Issue number6
DOIs
Publication statusPublished - 2016 Jun 1

Fingerprint

Cochlear Implantation
Cochlear Nerve
Facial Nerve
Control Groups
Pediatrics
Electrodes
Cohort Studies
Retrospective Studies

Keywords

  • bony cochlear nerve canal
  • Cochlear implantation
  • facial nerve stimulation

ASJC Scopus subject areas

  • Otorhinolaryngology

Cite this

Rah, Y. C., Yoon, Y. S., Chang, M. Y., Lee, J. Y., Suh, M. W., Lee, J. H., ... Park, M. K. (2016). Facial nerve stimulation in the narrow bony cochlear nerve canal after cochlear implantation. Laryngoscope, 126(6), 1433-1439. https://doi.org/10.1002/lary.25655

Facial nerve stimulation in the narrow bony cochlear nerve canal after cochlear implantation. / Rah, Yoon Chan; Yoon, Young Sun; Chang, Moon Young; Lee, Ji Young; Suh, Myung Whan; Lee, Jun Ho; Oh, Seung Ha; Chang, Sun O.; Park, Moo Kyun.

In: Laryngoscope, Vol. 126, No. 6, 01.06.2016, p. 1433-1439.

Research output: Contribution to journalArticle

Rah, YC, Yoon, YS, Chang, MY, Lee, JY, Suh, MW, Lee, JH, Oh, SH, Chang, SO & Park, MK 2016, 'Facial nerve stimulation in the narrow bony cochlear nerve canal after cochlear implantation', Laryngoscope, vol. 126, no. 6, pp. 1433-1439. https://doi.org/10.1002/lary.25655
Rah, Yoon Chan ; Yoon, Young Sun ; Chang, Moon Young ; Lee, Ji Young ; Suh, Myung Whan ; Lee, Jun Ho ; Oh, Seung Ha ; Chang, Sun O. ; Park, Moo Kyun. / Facial nerve stimulation in the narrow bony cochlear nerve canal after cochlear implantation. In: Laryngoscope. 2016 ; Vol. 126, No. 6. pp. 1433-1439.
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abstract = "Objectives/Hypothesis To evaluate the correlation between a narrow bony cochlear nerve canal (BCNC) and facial nerve stimulation (FNS) after cochlear implantation (CI) and their underlying mechanisms and to predict the risk of FNS preoperatively. Study Design Retrospective cohort study. Methods A total of 64 pediatric cases that underwent CI were included. Among them, 32 cases experienced FNS after CI, and another 32 cases were selected from 817 pediatric implantees by stratified random sampling. The width of the BCNC, the status of the cochlear nerve (CN) and the internal auditory canal (IAC), T level, and C level were compared and analyzed. Strategies for eliminating FNS were also analyzed. Results The FNS group showed a narrower BCNC (1.09 ± 0.52 mm) than the control group (1.99 ± 0.61 mm; P <.01), a lower CN/facial nerve ratio (0.32 ± 0.36) than the control group (1.34 ± 0.76; P <.01), and narrower IAC diameter (4.06 ± 1.71 mm) than the control group (5.66 ± 1.36 mm; P <.01). The FNS group also showed higher T level (165.7 ± 28.3 μA) than the control group (142.2 ± 21.2 μA; P <.01). Adjustment of the C levels and/or pulse width and switching off offending electrodes were attempted to eliminate FNS, with a 75.0{\%} success rate. The FNS group still showed low Categories of Auditory Performance scores (3.00 ± 1.90) compared with the control group (5.94 ± 1.41, P <.01) after adjustment. Conclusions A narrow BCNC could be a cause of FNS after CI. Therefore, careful selection of the side for CI and programming strategies are required to reduce FNS.",
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AU - Rah, Yoon Chan

AU - Yoon, Young Sun

AU - Chang, Moon Young

AU - Lee, Ji Young

AU - Suh, Myung Whan

AU - Lee, Jun Ho

AU - Oh, Seung Ha

AU - Chang, Sun O.

AU - Park, Moo Kyun

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AB - Objectives/Hypothesis To evaluate the correlation between a narrow bony cochlear nerve canal (BCNC) and facial nerve stimulation (FNS) after cochlear implantation (CI) and their underlying mechanisms and to predict the risk of FNS preoperatively. Study Design Retrospective cohort study. Methods A total of 64 pediatric cases that underwent CI were included. Among them, 32 cases experienced FNS after CI, and another 32 cases were selected from 817 pediatric implantees by stratified random sampling. The width of the BCNC, the status of the cochlear nerve (CN) and the internal auditory canal (IAC), T level, and C level were compared and analyzed. Strategies for eliminating FNS were also analyzed. Results The FNS group showed a narrower BCNC (1.09 ± 0.52 mm) than the control group (1.99 ± 0.61 mm; P <.01), a lower CN/facial nerve ratio (0.32 ± 0.36) than the control group (1.34 ± 0.76; P <.01), and narrower IAC diameter (4.06 ± 1.71 mm) than the control group (5.66 ± 1.36 mm; P <.01). The FNS group also showed higher T level (165.7 ± 28.3 μA) than the control group (142.2 ± 21.2 μA; P <.01). Adjustment of the C levels and/or pulse width and switching off offending electrodes were attempted to eliminate FNS, with a 75.0% success rate. The FNS group still showed low Categories of Auditory Performance scores (3.00 ± 1.90) compared with the control group (5.94 ± 1.41, P <.01) after adjustment. Conclusions A narrow BCNC could be a cause of FNS after CI. Therefore, careful selection of the side for CI and programming strategies are required to reduce FNS.

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