J Audiol Otol.  2019 Jul;23(3):153-159. 10.7874/jao.2019.00066.

Effects of Residual Hearing on the Auditory Steady State Response for Cochlear Implantation in Children

• Kim YS
• Han SA
• Woo H
• Suh MW
• Lee JH
• Oh SH
• Park MK

• KMID: 2454659
• DOI: http://doi.org/10.7874/jao.2019.00066

Abstract

BACKGROUND AND OBJECTIVES
We aim to explore the effects of residual auditory steady state response (ASSR) on cochlear implantation (CI) outcomes in children lacking auditory brainstem responses (ABRs).
SUBJECTS AND METHODS
We retrospectively reviewed the data of child CI recipients lacking ABRs. All ears were divided into two groups: with residual ASSR and without ASSR. For each frequency, the T- and C-levels and the electrical dynamic ranges of postoperative 3-month and 1-year mappings were compared between the groups. To evaluate speech perception, patients who received simultaneous bilateral CIs were divided into two groups: group 1 exhibited responses at all frequencies in both ears; in group 2, at least one ear evidenced no response. The Categories of Auditory Perception (CAP) and Infant-Toddler Meaningful Auditory Integration Scale (IT-MAIS) scores were compared between the groups.
RESULTS
We enrolled 16 patients. At 2 kHz, the postoperative 3-month and 1-year T-levels of patients with residual hearing were lower than those of hearing loss group (p=0.001, p=0.035). In residual hearing group, the ASSR threshold correlated positively with the postoperative 1-year T-level (p=0.012, R² =0.276) and C-level (p=0.002, R² =0.374). Of 10 simultaneous bilateral CI recipients, 5 exhibited ASSRs at all frequencies and the other 5 showed no response at ≥1 frequency. The latter had higher CAP scores at the postoperative 1-year (p=0.018).
CONCLUSIONS
In children exhibiting hearing loss in ABR testing, residual hearing at 2 kHz ASSR correlated positively with the post-CI T-level. Those with ASSRs at all frequencies had significantly lower CAP scores at the postoperative 1year. CI should not be delayed when marginal residual hearing is evident in ASSR.

Keyword

Cochlear implantation; Auditory brainstem evoked response; Auditory evoked response; Sensorineural hearing loss; Speech perception

MeSH Terms

Auditory Perception
Child*
Cochlear Implantation*
Cochlear Implants*
Ear
Evoked Potentials, Auditory
Evoked Potentials, Auditory, Brain Stem
Hearing Loss
Hearing Loss, Sensorineural
Hearing*
Humans
Retrospective Studies
Speech Perception