Abstract:Introduction Cochlear implants (CIs) enable objective measures of the neural function in implanted patients through the measurements of the neural response telemetry (NRT) and of the Auditory nerve Recovery Function (REC). These measurements help in programming the speech processor and understanding the auditory system.
Objective To compare the NRT and the REC in prelingual and postlingual implanted patients.
Methods An observational, descriptive and prospective study was carried out. The N… Show more
“…However, the relative refractory period was longer in people with longer duration of hearing loss [39,42]. There was no difference in the temporal recovery of the auditory nerve between pre-and postlingual CI users [43].…”
The electrode-neuron interface (ENI) plays an important in the outcome with cochlear implants as all cochlear implant-mediated signals should pass through this interface. Telemetry has enabled researchers to study factors affecting the quality and integrity of the interface. These factors may influence electrodes, the path between electrodes and auditory neurons, and spiral ganglion neuron survival. Promising studies on animals regarding such factors have opened new possibilities to identify cochlear implant channels with poor electrode-neuron interface. The results of these studies and similar research on human with focus were discussed in this chapter.
“…However, the relative refractory period was longer in people with longer duration of hearing loss [39,42]. There was no difference in the temporal recovery of the auditory nerve between pre-and postlingual CI users [43].…”
The electrode-neuron interface (ENI) plays an important in the outcome with cochlear implants as all cochlear implant-mediated signals should pass through this interface. Telemetry has enabled researchers to study factors affecting the quality and integrity of the interface. These factors may influence electrodes, the path between electrodes and auditory neurons, and spiral ganglion neuron survival. Promising studies on animals regarding such factors have opened new possibilities to identify cochlear implant channels with poor electrode-neuron interface. The results of these studies and similar research on human with focus were discussed in this chapter.
“…We believe that our patients found it easy to detect the sound and even to recognize it, because they had all post-lingual hearing loss and already wore a CI in one ear or hearing aids. We have previously studied pre-and postlingual differences in programming elsewhere [22]. It was possible to observe with Map 2, level "C" at the NRT threshold, a higher percentage of detection and recognition of Ling sounds when compared to Map 1.…”
Cochlear implant (CI) activation usually takes place at about 30 days postoperative (PO). In our service, CI surgery is performed with local anesthesia and sedation, so Activation is possible with the patient’s cooperation, immediately after the CI surgery, still in the Operating Room (OR). The objective of this study was to provide the patient with hearing experience with the CI and to assess auditory perception immediately after surgery while still in the OR, and to compare Impedance Telemetry (IT), Neural Response Telemetry (NRT) and Comfort (C) level at two moments: in the OR and at the definitive Activation, approximately 30 days PO. Nine adults (12 ears) with acquired (post-lingual) deafness were included. Auditory perception was evaluated through Ling Sounds, musical instruments and clapping, presented in two different programming maps, elaborated using t-NRT, comparing between the two moments. We observed that while still in the OR, the patient can already present auditory detection and recognition responses. The values of impedance, t-NRT and “C” level on both dates differed with statistical significance. We concluded that it is possible to provide the patient with an auditory experience with the CI immediately after surgery, and that the auditory experience and the values of electrode IT, NRT and “C” level vary significantly between the two moments.
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