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To Use the Back-up Cochlear Implant or Not? Using Intra-operative Impedance to Guide Your Decisions
- Source :
- Otology & Neurotology. 43:e408-e413
- Publication Year :
- 2022
- Publisher :
- Ovid Technologies (Wolters Kluwer Health), 2022.
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Abstract
- Intra-operative electrophysiological testing is being increasingly used to determine device functionality. Impedance abnormalities (open or short circuits) measured at time of surgery pose a dilemma: is it likely to resolve or is it a permanent fault? There is little in the literature on how to manage these intraoperative finding and if, at time of surgery, the back-up device should be used.We routinely undertake impedance testing twice intraoperatively, as well as at switch on, 1 and 3 months postoperatively. Retrospective impedance thresholds were analysed for one surgeon's cases between January 2018 and December 2019.There were 235 cochlear implants performed for 217 patients (5,020 electrode contacts) analysed. Thirty-three electrodes had abnormal impedance thresholds on first intraoperative cycle of testing, 76% resolving with the second testing cycle electrode contacts that demonstrated abnormal impedance during both intraoperative test cycles were 16.54 times (95%CI 2.55-107.13, p = 0.003) more likely to be abnormal at three months. Fifty percent resolved by switch on. The intraoperative abnormalities made up 26% of electrode abnormalities seen at 3 months postoperatively.This study demonstrates the utility of 2 cycles of intraoperative impedance testing, with persistently abnormal electrodes having 16 times the likelihood of persistent abnormalities of impedance, and 50% resolution. These persistent intra-operative abnormal electrodes are responsibly for 26% of electrode abnormalities at 3 months. This information is useful for the surgeon when considering use of the backup cochlear implant device.
Details
- ISSN :
- 15374505 and 15317129
- Volume :
- 43
- Database :
- OpenAIRE
- Journal :
- Otology & Neurotology
- Accession number :
- edsair.doi.dedup.....ddbc8f790b0dcaf20cf661e355a428c6