Speech-ABRs in cochlear implant recipients: feasibility study

Abstract

Objective: The aim of this study was to assess the feasibility of recording speech-ABRs from cochlear implant (CI) recipients, and to remove the artefact using a clinically applicable single-channel approach. Design: Speech-ABRs were recorded to a 40 ms [da] presented via loudspeaker using a two-channel electrode montage. Additionally, artefacts were recorded using an artificial-head incorporating a MED-EL CI with stimulation parameters as similar as possible to those of three MED-EL participants. A single-channel artefact removal technique was applied to all responses. Study sample: A total of 12 adult CI recipients (6 Cochlear Nucleus and 6 MED-EL CIs). Results: Responses differed according to the CI type, artefact removal resulted in responses containing speech-ARB characteristics in two MED-EL CI participants; however, it was not possible to verify whether these were true responses or were modulated by artefacts, and artefact removal was successful from the artificial-head recordings. Conclusions: This is the first study that attempted to record speech-ABRs from CI recipients. Results suggest that there is a potential for application of a single-channel approach to artefact removal. However, a more robust and adaptive approach to artefact removal that includes a method to verify true responses is needed.

Frequency-Following Response (FFR) em usuários de implante coclear: uma revisão sistemática dos parâmetros de aquisição, análise e resultados

“…In the eligibility stage, one study (20) was excluded because it lacked data on the implanted ear. Hence, only six studies were included (10)(11)(12)(13)21,22) for data extraction (Figure 1). The characteristics of the six studies included in the review are presented in Table 1.…”

“…Mourad et al, 2016; Egypt (11) Rahman et al,2017; Egypt (12) SPEAK (BP+1/ BP+2) 2016 (11) , 2017 (12) , 2018 (21) , and 2020 (22) . Four studies were from Egypt (10)(11)(12)21) , one from the United Kingdom (13) , and one from Iran (22) . All studies were observational.…”

“…The sample distribution varied in subcategorized groups that followed the originating issues in each primary research. The sample size ranged from 10 (11) to 40 (21) CI users, and their age ranged from 2 (10) to 60 years (13) . Five studies were conducted with children (10)(11)(12)21,22) .…”

“…This is a challenging scenario because choosing inadequate parameters may contaminate the FFR records. In this regard, the electrical artifact generated by the CI makes the clinical interpretation of the results more difficult, setting an inherent limitation to its possible applicability in CI users (13) .…”

Use of Functional Near-Infrared Spectroscopy to Predict and Measure Cochlear Implant Outcomes: A Scoping Review

“…Magnetic artefacts are also problematic for magnetoencephalography (MEG). EEG data can be limited by implant-related electrical artefacts-though new analysis techniques are being developed to overcome this [63,64]. Some studies have successfully used PET to image the brain following cochlear implantation [65][66][67].…”