A Prospective, Multicentre Case-Control Trial Examining Factors That Explain Variable Clinical Performance in Post Lingual Adult CI Recipients.
Pam Dawson, Amanda Fullerton, Harish Krishnamoorthi and 7 others
PMID 40576960WHAT IT FOUND
Poorer speech recognition in adults with cochlear implants was linked to underfitted T-levels, higher electrical thresholds, slower nerve recovery, and greater nerve response offset.
Scalar translocation and cognitive measures also mattered.
Key findings
01Low T-levels in the everyday MAP were a consistent predictor of poorer CI performance across several outcomes.
02Higher average bipolar thresholds and higher average total refractory time were associated with poorer CI performance.
03Scalar translocation was associated with 14.9 times the chance of being a poor performer and a 4.9 dB increase in sentence-in-noise SRT.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
This was an exploratory case-control study of associations, so it cannot show that changing any single factor improves CI performance. The p-values were not corrected for multiple testing, which increases the chance of false-positive findings. Many multivariable models used different subsets of subjects, with sample sizes ranging from 47 to 80, so the predictors are not all based on the full group. Some poor performers completed only a shortened single-visit battery, and PECAP and electrode placement variables were excluded or analysed in subgroups because of missing data or small samples. Some bipolar thresholds could not be measured at the device limit and were estimated, so the true values were probably higher.
The easy way to misread this
Do not assume that raising underfitted T-levels will improve speech perception. The study found associations in a case-control design, not a tested mapping intervention.