Objective: To study the effect of binaural bi-modal fitting (one cochlear implant and a contralateral hearing aid) on speech recognition of cochlear implant recipients with low frequency electrodes incompletely implanted.
Method: A total of 15 cochlear implant(CI) users who have low residual hearing (250 Hz 45-90 dBHL, 500 Hz 75 - 100 dBHL) of their non surgery ears. We closed the top three electrodes to simulate the state of low-frequency electrodes incompletely implanted by fitting software. (1) The same tester received twice speech recognition tests in incompletely implanted state, one test used single CI model and the other used binaural bi-modal fitting model. (2)The same tester received above twice speech recognition tests again, but in completely implanted state. Then we compared the results of tests.
Result: The CI users used binaural bi-modal fitting have higher speech recognition score than the same users used unilateral cochlear implant model in low-frequency electrodes incompletely implanted state(P<0. 05). The gap between the scores of the tests by using two usage patterns in low frequency electrodes incompletely implanted state was more than that in completely implanted state (P<0. 05).
Conclusion: Binaural bi-modal fitting can help CI users to improve their speech recognition ability in low-frequency electrodes incompletely implanted state.
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