Vestibular Preservation After Cochlear Implantation Using the Round Window Approach.

Area of Science:

• Otolaryngology
• Neurosurgery
• Audiology

Background:

• Cochlear implantation (CI) can lead to vestibular dysfunction and vertigo.
• Advancements in surgical techniques and electrode design aim to minimize CI complications.
• Preserving residual hearing and vestibular function are key goals in modern CI surgery.

Purpose of the Study:

• To evaluate vestibular function changes after cochlear implantation using less traumatic surgical techniques.
• To specifically assess the impact of the round window approach (RWA) and flexible electrodes on vestibular function.
• To compare vestibular outcomes between less traumatic and conventional CI surgical methods.

Main Methods:

• Sixty-six patients undergoing cochlear implantation (CI) with the round window approach (RWA) and flexible electrodes were studied.
• Vestibular function was assessed using caloric testing, cervical vestibular evoked myogenic potential (cVEMP), and ocular VEMP (oVEMP).
• Pre- and post-implantation data were collected to evaluate changes in semicircular canal, saccular, and utricular function.

Main Results:

• High rates of preserved vestibular function were observed: 93.9% (caloric), 82.4% (cVEMP), and 92.5% (oVEMP) post-implantation.
• No significant differences in abnormal caloric or oVEMP results were found between RWA and cochleostomy groups.
• The cochleostomy group showed a significantly higher frequency of abnormal cVEMP responses compared to the RWA group.

Conclusions:

• Cochlear implantation using the round window approach (RWA) and flexible electrodes significantly reduces the risk of vestibular function impairment.
• Less traumatic CI surgical techniques are associated with better preservation of saccular function.
• These findings support the use of RWA and flexible electrodes for minimizing vestibular complications after cochlear implantation.