Mapping of Pediatric Cochlear Implant Using Neural Response Threshold and Behavioral Observation Audiometry
30 September 2019 (online)
Aim To measure the correlation between neural/auditory response threshold (NRT/ART) and most comfortable level for behavioral (MCLB), whichever is better for rehabilitations purpose and to calculate the impedance.
Materials and Methods Mapping may be done by various methods. We performed neural/auditory response threshold (NRT/ART) and behavioral observation audiometry (BOA). NRT/ART is the technique by which we measure the response from the auditory nerve using the hi-resolution bionic ear system. Neural response measurement depends on the neural tissue, stimulus used, and recording technique. BOA is used for observing motor response on presenting sound to the implanted child. Most comfortable level for behavioral (MCLB) is calculated for behavioral response. It measures the useful information about low-frequency hearing, it provides more information about the hearing of neurologically immature babies, it demonstrates the benefit of hearing aids, and give indication of uncomfortable loudness levels. The NRT/ART and MCLB were calculated for second, sixth, and eleventh electrode for different patients in our study.
Result Neural response threshold is better for rehabilitations then behavioral observation audiometry for CI patients. Mean value and standard deviation of auditory/neural response threshold were 10.23, 3.67; 11.27, 4.39; and 10.71, 3.88 at second, sixth, and eleventh electrodes, respectively. Mean value and standard deviation of most comfortable level for behavioral response were 20.49, 7.08; 21.26, 7.31; and 21.01, 6.03 at second, sixth, and eleventh electrodes, respectively.
Conclusion Neural response threshold is better for postoperative rehabilitations and MCL and THR vary with different electrodes and in different patients.
Clinical Significance Neural/auditory response threshold (NRT/ART) is much more significant and better for rehabilitations for cochlear implant recipient than most comfortable level for behavioral (MCLB).