Outcomes of Cochlear Implant Recipient With ANSD: Intra and Post Operative Findings, Progress in Audition and Speech Skills

Abstract

Introduction

Auditory neuropathy spectrum disorder (ANSD) is a distinct type of SNHL that is characterized by the presence of otoacoustic emissions and/or cochlear microphonics. Cochlear implantation was initially not recommended for ANSD children, later studies showed variable outcomes among ANSD. CI is currently the intervention option of choice for many children with ANSD who are unable to obtain benefit from conventional amplification.

Aim and Objectives

To review experiences with some of the preoperative and postoperative findings in a child who was diagnosed with auditory neuropathy and provided with cochlear implant. To describe changes in auditory function, which enabled to have significant improvement in hearing and communication skills through auditory verbal therapy (AVT) and regular follow ups.

Study Design

Pre and postoperative, findings in cochlear implant recipient who was diagnosed with ANSD. Child received complete medical examinations, including related consultations in audiology, otorhinolaryngology, paediatrics, neurology, psychology, speech language pathology, and radiology.

Methodology/Case Report

A 3-year-old-female have brought to the hospital with a C/o not responding to sounds, name call and unable to speak. Medical and Audiological evaluations were initiated. The hearing assessments of the child included appropriate behavioural audiometric techniques, objective measures of middle ear function, acoustic reflex studies, transient evoked (TEOAE), distortion product (DPOAE) otoacoustic emissions and auditory brainstem responses (ABR). Implanted with (HiRes Ultra CI HiFocus SlimJ Electrode), and objective measures were recorded intraoperatively electrode impedances and neural response telemetry (NRT) to assess the outcomes technically. These intraoperative objective measures were used to help program the speech processor for the child. Postoperatively, child has had regular follow-up with otorhinolaryngologist to assure complete healing of the surgical incision, to assess their general medical conditions, and audiologist for switch-on (speech processor) followed by map**. The hearing and communication skills have been assessed, also continued Auditory Verbal Therapy (AVT) on a regular basis. Postoperatively, objective measures were recorded in regular intervals and monitored with therapy outcomes.

Results

 The child has shown significant improvement in sound detection, speech perception abilities, communication skills and shown evidence of progression of good NRT results, which  were recorded and had no postoperative complications.

Conclusion

 Experience with cochlear implantation for child diagnosed with ANSD that effectively received and benefited from CI. A detailed and careful evaluations, audiological follow-ups and tailored rehabilitation plans, can be considered as a beneficial management approach for CI, especially who diagnosed with ANSD. The regular use of cochlear implant in this diagnosis can lead to a clear increase in speech comprehension, development and overall progress in quality of life. Success or lack of success with a CI appears to be somewhat dependent on the specific site of lesion (pre- or post-synaptic). Currently there are no clinical measures available to diagnose the specific site of lesion. Indeed, CI appears to be an effective rehabilitation modality for ANSD patients. This may be explained by the fact that the implanted electrode delivers synchronized electrical impulses directly to the auditory nerve, bypassing the presynaptic IHCs and its synapse involved in the unsynchronized firing of the auditory nerve described in ANSD. However, genetic studies that have proven to be essential in the knowledge of underlying mechanisms of ANSD represent a promising therapeutic approach in the management of ANSD.