Does the Width of the Bony Cochlear Nerve Canal Predict the Outcomes of Cochlear Implantation?

Abstract EN

A narrow bony cochlear nerve canal (BCNC) is associated with sensorineural hearing loss necessitating cochlear implantation (CI).

This study evaluated the implications of BCNC width for post-CI outcomes.

A total of 56 children who had received CIs were included.

The patients were divided into three groups according to the width of the BCNC (Group 1: diameter < 1.4 mm, n = 17 ; Group 2: diameter 1.4–2.0 mm, n = 14 ; Group 3: diameter > 2.0 mm, n = 25 ).

The post-CI speech performances were compared among the three groups according to BCNC width.

The correlation between BCNC width and post-CI speech performance was evaluated.

Logistic regression analysis was also performed to investigate factors that can impact post-CI speech performance.

Cochlear nerve deficiency (CND) occurred more frequently in Group 1.

Groups 1 and 2 had significantly worse post-CI outcomes.

Patients with intact cochlear nerves had significantly better post-CI outcomes than those with CND.

When the cochlear nerve was intact, patients with a narrower BCNC showed less favorable results.

Therefore, patients with either a narrow BCNC or CND seemed to have poorer outcomes.

A narrow BCNC is associated with higher CND rates and poor outcomes.

Measurement of BCNC diameter may help predict CI outcomes.