Evaluation method of free-field audiometric thresholds in patients with Cochlear Implant
On the use of Auditory Steady State responses for Assessment of Target Performance of Cochlear Implants
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https://doi.org/10.51445/sja.auditio.vol4.2015.0054Keywords:
auditory steady-state responses, hearing prosthetics, free-field, multiple frequencies, cochlear implant, audiometryAbstract
The evaluation of functional gain in free field in patients with cochlear implants is a fundamental element in clinical audiology. An objective tool is the Multi-frequency Auditory Steady-State Responses (MF-ASSR) that allow this evaluation of functional gain. This work aims to demonstrate the clinical value of MF-ASSR in the objective characterization of hearing thresholds in patients with a cochlear implant. This clinical-electrophysiological study has been carried out in 14 patients, all of them with cochlear implants, and aged between 2 and 14 years, for which there are 44 records. For each record there are 8 measurements (2 for each of the 500Hz, 1000Hz, 2000Hz and 4000Hz frequencies) of the functional gain in free field measured by two methods: behavioral thresholds (BT) and electrophysiological thresholds obtained with the MF-ASSR (ET) . The MF-ASSRs have been carried out in free field, in natural sleeping conditions and in a soundproofed cabin. Likewise, each patient has undergone a free-field behavioral study that has allowed us to compare the BT with the ET. The mean values of the evoked potentials are lower than the UC, for the frequencies of 500Hz, 1000Hz, 2000Hz and 4000 Hz and also the behavior according to the frequencies is the same. The values of the mean differences (BT-ET) are represented in Figure 4, the largest differences being at 500Hz (1.50 dBHL) and 4000Hz (1.49 dBHL) respectively. The difference between both types of UC and UE thresholds varies from 1 dBHL to 1.5 dBHL, these differences not being statistically significant. These results conclude that the audiometry obtained with MF-ASSR constitutes an objective methodology that allows to provide valuable and very useful information for the characterization of hearing thresholds in free field in patients with cochlear implants.
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