Relationships between bilateral auditory brainstem activity and inter-implant interval in children with cochlear...

Area of Science:

• Neuroscience
• Audiology
• Biomedical Engineering

Background:

• Bilateral cochlear implantation (CI) is a common treatment for profound bilateral sensorineural hearing loss.
• The timing of sequential bilateral CI may influence the development of auditory pathways.

Purpose of the Study:

• To examine how the interval between bilateral cochlear implantations affects the maturation of auditory brainstem pathways.
• To compare sequential versus simultaneous bilateral CI using electrically evoked auditory brainstem responses (EABRs).

Main Methods:

• Fifty-eight children with bilateral sensorineural hearing loss were studied.
• 33 received sequential bilateral CIs, 25 received simultaneous bilateral CIs.
• Bilateral EABRs were recorded upon activation of the second CI.

Main Results:

• In sequential CI cases, wave III and V latencies were shorter on the first CI side compared to the second.
• Simultaneous CI showed similar latencies between sides.
• Longer intervals in sequential CI correlated with prolonged latencies and imbalanced pathway development.

Conclusions:

• Unilateral CI use aids ipsilateral auditory pathway maturation.
• Extended intervals between bilateral CIs lead to unbalanced auditory brainstem pathway development.
• Simultaneous or short-interval bilateral CI is recommended for optimal outcomes.