The Inter-Phase Gap Offset Effect as a Measure of Neural Health in Cochlear Implant Users With Residual Acoustic Hearing.
Leanne Sijgers, Christof Röösli, Rahel Bertschinger and 5 others
PMID 39054580WHAT IT FOUND
The inter-phase gap offset effect did not correlate with ECAP thresholds or residual hearing, so it failed to indicate neural health in these cochlear implant users.
Instead, the effect changed with electrode impedance and hair cell function, limiting its clinical utility.
Key findings
01The inter-phase gap offset effect did not correlate with ECAP thresholds or pure-tone averages, contradicting the hypothesis that it reflects neural health.
02Changes in the inter-phase gap offset effect were associated with changes in electrode impedance and decreases in electrocochleography responses.
03Postoperative inter-phase gap offset measurements were only successful in slightly more than half of the electrode sets due to patient tolerance issues.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The postoperative ECAP thresholds were derived from amplitude growth functions rather than the standard algorithm used intraoperatively, introducing measurement inconsistencies. Stimulation parameters such as inter-phase gap and pulse rate differed between intraoperative and postoperative recordings, which could affect the results. The small sample size of 17 participants and the exclusion of several electrode sets due to measurement failures limit the generalizability of the findings.
Declared interests
The authors declared no specific financial conflicts in the provided text, though the study used equipment and software from Cochlear Limited.
The easy way to misread this
Do not interpret the inter-phase gap offset effect as a reliable indicator of auditory nerve health in this population. The study found it correlates with non-neural factors like impedance and hair cell integrity, and the hypothesized relationships with neural health measures were absent.