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On influence of cochlear modiolus dysplasia to CI auditory outcome
Zhang D.
Affiliated Beijing Friendship Hospital of Capital Medical University, Beijing, China, 2Beijing Friendship Hospital, Beijing, China
Objective: to study correlation between cochlear modiolus dysplasia and result of speech recognition test after
CI, and define classification system for modiolus dysplasia cases.
Methods and subjects: Based on high resolution temporal bone CT, 685 cases with bilateral inner ear
dysplasia were identified among 3503 CI cases ( 438 cases diagnosed as LAVS, 215 as Modini deformity, 18 as
common cavity, 13 as IP-III deformity). 2 types of cochlear modiolus dysplasia were identified among above 685
cases: typeâ… with partial modiolus present and typeⅡwith totally modiolus absent. Refer to methods applied for
auditory performance evaluation 3 months after CI activation, pure tone audiometry and mandarin speech
recognition test including initials and finals list were chosen for subjects older than 3 years. For subjects younger
than 3 years, auditory performance evaluation was conducted 12 months after CI activation. Evaluation was
conducted in standard sound field, in further details, initials including /a/, /e/, /i/ and finals /g/, /k/, /h/, /j/, /q/, /x/,
/z/, /c/, /s/ were chosen for test.
Result: 102 subjects were defined as typeâ… of modiolus dysplasia. Among this population, 52 cases were
identified from 438 LAVS cases (13%) and 45 from 215 Mondini deformity. 201 subjects were defined as type II,
which included 170 cases from 215 Mondini deformity cases (79%), 18 from 18 common cavity deformity (100%)
and 13 from 13 IP-III deformity (100%). Relative satisfying evaluation score was obtained in population of type I:
Average hearing threshold in sound field was 30 dB, recognition scores were 99% in finals test and 78% in
initials test. For population of type II, hearing threshold was 65dB, scores were 70& in finals test and 10% in
initials test.
Conclusion: Influence of cochlear modiolus dysplasia to auditory and speech performance after CI was
indicated. For patient with totally modiolus absent which was classified as type II, relative limited auditory
benefits was found, which was usually followed by poor capability of speech communication.
Keyword: cochlear modiolus dysplasia; cochlear implant