Electrophysiological Detection of Intracochlear Scalar Changing Perimodiolar Cochlear Implant Electrodes

Mittmann, Philipp; Todt, Ingo; Wesarg, Thomas; Arndt, Susan; Ernst, Arneborg; Hassepaß, Frederike

doi:10.1097/mao.0000000000000766

Cited by 23 publications

(37 citation statements)

References 38 publications

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“…The NRT ratio has been verified in a previous blinded retrospective multicentre study [Mittmann et al, 2015b]. With a NRT ratio >1.05, a high chance of a scalar change was rather likely, and an NRT ratio <1.05 was associated with a high chance of an electrode array position within the scala tympani.…”

Section: Introductionmentioning

confidence: 88%

“…Out of the group of 85 subjects who were part of the preliminary study [Mittmann et al, 2015b], 37 patients with completed 6-month electrophysiological data were enrolled in the present study. All recipients were daily CI users.…”

Section: Resultsmentioning

confidence: 99%

“…With the NRT ratio-estimated intracochlear position of the electrode array, a good correlation was seen compared with the radiological images (RT). An NRT ratio <1.05 indicates a certain electrode position within the scala tympani [Mittmann et al, 2015b]. Six-month follow-up data were available from 37 subjects.…”

Section: Discussionmentioning

confidence: 99%

“…The inclusion criterion was completed NRT measurements 6 months after cochlear implantation. Subjects who fulfilled the inclusion criterion were extracted out of a previous study [Mittmann et al, 2015b]. If a subject did not have any exact 6-month data, the next point (up to 1 month) close to the 6-month interval was chosen.…”

Section: Methodsmentioning

confidence: 99%

“…With a NRT ratio >1.05, a high chance of a scalar change was rather likely, and an NRT ratio <1.05 was associated with a high chance of an electrode array position within the scala tympani. Limited applicability of the NRT ratio was seen in patients with an anomalous anatomy, intraoperative complications, long-term deafness, syndromic disorders with reduced or inhomogenous density of spiral ganglion cells, or chronic diseases with neural degeneration [Mittmann et al, 2015b].…”

Section: Introductionmentioning

confidence: 99%

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Electrophysiological Detection of Scalar-Changing Perimodiolar Cochlear Electrode Arrays: A Six-Month Follow-Up Study

Mittmann¹,

Todt²,

Wesarg³

et al. 2015

Audiol Neurotol

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The position of the cochlear electrode array within the scala tympani is essential for optimal hearing benefit. An intraoperative neural response telemetry ratio (NRT ratio; a threshold ratio of pairs of apical and basal electrodes) has been established, which can provide information about the intracochlear electrode array position. Out of a previous collective of 85 patients, the 6-month follow-up electrophysiological NRT data of 37 patients have been included in this study. Comparing the intraoperatively estimated NRT ratio with the 6-month follow-up NRT ratio, it remained unchanged intraindividually in 92% of cases. Within this group the NRT ratio and the intracochlear position of the electrode array matched in all cases. There were two newly occurring mismatches and one new match was observed. After a period of 6 months the NRT ratio remained unchanged in most cases and showed a good correlation with the intracochlear position of the electrode array.

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Section: Introductionmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrophysiological Detection of Scalar-Changing Perimodiolar Cochlear Electrode Arrays: A Six-Month Follow-Up Study

Mittmann¹,

Todt²,

Wesarg³

et al. 2015

Audiol Neurotol

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Electrophysiological detection of scalar changing perimodiolar cochlear electrode arrays: a long term follow-up study

Mittmann

Todt

Ernst

et al. 2016

Eur Arch Otorhinolaryngol

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The position of the cochlear electrode array within the scala tympani is essential for an optimal hearing benefit. An intraoperative NRT-ratio was established, which can provide information about the intraoperative intracochlear electrode array position for perimodiolar electrodes. The aims of this study were to verify the longterm reliability for the NRT-ratio in perimodiolar electrodes. In a retrospective controlled study in a Tertiary Referral Center the electrophysiological data sets of 123 patients with implanted Nucleus Contour Advance electrodes were enclosed. Intraoperative and up to 1 year follow-up Auto-NRTs were evaluated. A NRT-ratio was calculated by dividing the average Auto-NRT data from electrode 16 to 18 with the average from electrode 5 to 7. Using a flat panel tomography system, the position of the electrode array was certified radiological. 31 patients with perimodiolar electrodes with 1 year follow-up data were included in the study. Eleven patients showed regular follow-up NRT-ratio with a correlated and radiologically confirmed electrode position. 20 patients showed mismatches between the NRT-ratio and the radiological position. These patients were highly variable in terms of duration of deafness and neural spectrum disorders. The NRT-ratio can be used to determine the intracochlear position of the electrode array for perimodiolar electrodes. Intraoperatively the NRT-ratio predicts the array position within the cochlea highly reliable for perimodiolar electrodes. We showed that after 6 months and a year, the NRT-ratio remains unchanged in most of the cases and shows a good correlation to the radiological determined position of the array. Nevertheless, the condition of the neural structures is highly important for reproducible responses. Limited validity is given in patients with degenerative and structural neural disorders.

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Electrophysiological detection of electrode fold-over in perimodiolar cochlear implant electrode arrays: a multi-center study case series

Mittmann

Lauer

Ernst

et al. 2019

Eur Arch Otorhinolaryngol

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Electrophysiological Detection of Intracochlear Scalar Changing Perimodiolar Cochlear Implant Electrodes

Abstract: Evidenced by a blinded group of patients, we are able to show that the electrode array position within the cochlea could be predicted using the NRT ratio.

Cited by 23 publications

References 38 publications

Electrophysiological Detection of Scalar-Changing Perimodiolar Cochlear Electrode Arrays: A Six-Month Follow-Up Study

Electrophysiological Detection of Scalar-Changing Perimodiolar Cochlear Electrode Arrays: A Six-Month Follow-Up Study

Electrophysiological detection of scalar changing perimodiolar cochlear electrode arrays: a long term follow-up study

Electrophysiological detection of electrode fold-over in perimodiolar cochlear implant electrode arrays: a multi-center study case series

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