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Transcript
P1-8-22
CI surgical technique and post-op auditory benefit for cases with cochlear ossification
Zhang D.
1
1
Affiliated Beijing Friendship Hospital of Capital Medical University, Beijing, China
Objective: To research surgical technique for cases with cochlear ossification and to summarize surgical
approaches for successful operation.
Method: Basing on result of pre-op temporal bone CT, 79 cases diagnosed with cochlear ossification were
classified into following 4 groups: ossification in round window, ossification in basal turn, ossification in 1/2 to 3/4
turn, ossification more than 3/4 turn. 3 surgical approaches were determined for 4 groups because same surgical
approach was applied for group 2 and 3.
Results: 79 cochlear ossification cases were confirmed among 3175 CI cases. For further detail, 21 cases were
confirmed as group 1, and 41 cases as group 2, 13 cases as group 3 and 4 cases as group 4. Electrode arrays
were inserted successfully for all 79 cases. Regarding to surgical approaches, approach 1 was applied for group
1, approach 2 for group 2 and 3, and approach 3 for group 4. After activation, electric-stimulating hearing was
obtained for 74 cases via surgical approach 1 and 2. Average hearing threshold with CI in speech frequency was
35dBHL, while score of Mandarin speech recognition test 3 months after activation was achieved as 100% for
mono-syllable rime and 91% for mono-syllable onset. 4 cases were conducted with approach 3; Average hearing
threshold with CI in speech frequency was 70dBHL, while score of Mandarin speech recognition test 3 months
after activation was achieved as 70% for mono-syllable rime and 30% for mono-syllable onset. One of those 4
cases was confirmed as modiolus ossification, score of this case was 50% for mono-syllable rime and 0% for
mono-syllable onset.
Conclusion: Key surgical technique for cochlear ossification case was preventing injury to modiolus. Speech
test score of case with cochlear ossification within 3/4 turn was equal to average score of all CI cases. Surgical
approach for case with whole cochlear ossification was complicated and auditory benefit post-op was not
reliable.
Key words: Cochlear Implantation, Surgical approach, Ossification
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