Wideband Acoustic Immittance in Cochlear Implant Recipients: Reflectance and Stapedial Reflexes.
Rachel A Scheperle, Joshua J Hajicek
PMID 31688195WHAT IT FOUND
Broadband reflex thresholds were not clearly lower than higher-frequency probe thresholds in ears with cochlear implants.
Reflectance varied widely, though average low-frequency reflectance was higher than in controls and a standard middle-ear test helped explain that difference.
Key findings
01Reflexes were measurable in 9 of 14 ears tested and in 24 of 46 electrodes tested with at least one probe condition, and 6 of 15 implanted ears had clinically significant immittance results.
02Implanted ears had higher average low-frequency reflectance than controls, but this group difference was largely explained when 226 Hz admittance was treated as a continuous variable.
03For 16 of the 24 electrodes with measurable reflexes, the broadband method showed a lower threshold, but the overall threshold difference was not statistically significant (p = 0.072).
STILL TO COME
How it was doneWhat they found
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What it does not show
The study included only a small group of CI recipients and a separate control group, so the findings may not apply broadly. Some CI recipients and controls were excluded before analysis, so the analysed groups were smaller than the recruited groups. The CI recipients were mostly long-term users, and detailed surgical records were not available, so results could not be linked to surgical technique, electrode insertion approach, lead stabilization, device type, or time after surgery. The control ears were selected with stricter middle-ear criteria than the CI ears, so group differences may partly reflect participant selection. The reflectance method required ear impressions to estimate ear-canal size, which is not a routine clinical solution. Threshold determination was partly subjective, and the broadband and single-frequency tests used different activator envelopes, which could confound the comparison. The paper reports middle-ear and reflex measures, not communication or therapy outcomes.
Declared interests
The work was supported by Montclair State University start-up funds and an internal grant. The authors declared no conflicts of interest.
The easy way to misread this
Do not read these results as evidence that wideband reflectance or broadband reflex testing should replace standard clinical measures. The sample was small, individual ear patterns varied, and the broadband threshold advantage over the higher-frequency probe was not statistically significant. The paper reports middle-ear and reflex measures only, not communication or therapy outcomes.