Participants
Retrospectively reviewed were the medical records of 1,251 patients who
underwent CI to treat profound hearing loss between August 2001 and
March 2021.All patients suffered severe or very severe bilateral
sensorineural hearing loss (HL, defined as hearing threshold
> 70 dB HL). Before the initial CI, assessments were
conducted of acoustic impedance, auditory brainstem response, distortion
product otoacoustic emissions, transient evoked otoacoustic emissions,
auditory steady state response. Middle ear high-resolution CT (HRCT) and
inner ear magnetic resonance hydrography were performed to rule out the
deformity in middle and inner ears, middle ear mastoiditis, tympanic
effusion, or other infections before operation. Brain MRI examination
was conducted to reveal potential white matter lesions and CI was
considered for those cases with mild and non-progressive white matter
lesions.