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Auditory brainstem implant: part I. Auditory performance and its evolution over time.

T Lenarz1, M Moshrefi, C Matthies

  • 1Department of Otolaryngology, Medical University of Hannover, Carl Neuberg-Strasse 1, D-30625 Hannover, Germany.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|November 8, 2001
PubMed
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Auditory brainstem implants provide immediate sensation, but central auditory system adaptation takes about six months for optimal hearing performance. This study evaluated auditory performance evolution in neurofibromatosis type 2 patients.

Area of Science:

  • Neuroscience
  • Audiology
  • Biomedical Engineering

Background:

  • Auditory brainstem implants (ABI) are neuroprosthetic devices designed to restore a sense of sound in individuals with auditory nerve loss.
  • Neurofibromatosis type 2 (NF2) is a genetic disorder often leading to bilateral vestibular schwannomas, necessitating ABIs for hearing rehabilitation.
  • Understanding the long-term auditory performance and adaptation patterns after ABI implantation is crucial for patient management and device development.

Purpose of the Study:

  • To evaluate the auditory performance in patients with auditory brainstem implants.
  • To assess the evolution of auditory performance over time after implantation.
  • To investigate the adaptation period required for the central auditory system to process ABI-generated auditory information.

Main Methods:

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  • A prospective study was conducted at a tertiary referral center.
  • Fourteen patients with NF2 underwent multichannel auditory brainstem implantation.
  • Auditory performance was assessed using vowel/consonant confusion, Freiburger numbers, and speech-tracking tests, with and without lip-reading, in 13 patients over 1-41 months post-activation.

Main Results:

  • Auditory sensation was achieved immediately in most patients post-activation.
  • Lip-reading enhancement was observed in over 50% of patients within two weeks, improving over six months.
  • Auditory-only performance showed gradual improvement, with significant results emerging around 3-6 months; open-set speech recognition was achieved later.

Conclusions:

  • Immediate auditory sensation is possible with auditory brainstem implants.
  • A six-month period is essential for central auditory system relearning and adaptation to the new auditory input.
  • Long-term auditory performance demonstrates progressive improvement, highlighting the importance of consistent device use and rehabilitation.