Introduction Cochlear implantation has been considered a viable option to restore hearing perception in adults with severe to profound postlingual hearing loss. Objectives To analyze behavioral hearing responses and P300 latency and amplitude measurements in adults with bilateral sensorineural hearing loss at two phases, first when they were using hearing aids (HAs) and, then, after 12 months of cochlear implant (CI) use. The association between behavioral and electrophysiological evaluations was explored, as it is believed that the study of auditory processing with different hearing devices can contribute to future CI adjustments and fittings, especially for patients who cannot give subjective feedback (such as small children and individuals with multiple disabilities). Methods Prospective comparative study (Ethical approval 11489/2014). Twelve adults were assessed, 7 males and 5 females, in the 22 to 76 years old age range, who had undergone CI surgery after HA experience. Results The analyses showed an improvement of hearing thresholds when patients started using CIs. Comparing data from P300 latency measurements, there was an increase of the P300 wave post-CI at Cz and Fz. Regarding the amplitude, P300 mean values decreased at Cz, but increased at Fz. There was no significant correlation between behavioral and electrophysiological assessment and the variables age, gender, auditory deprivation, and electronic device used. Conclusion There was a significant improvement of hearing thresholds after twelve months of CI experience. The mean latency values of P300 after 12 months of CI use increased at Cz and Fz, while mean amplitude values decreased at Cz and increased at Fz.

The cochlear implant is a prosthesis that is capable to replace listening capability among patients with sensorineural hearing loss. Many studies suggest a negative relationship among duration of sound deprivation and audiometric gain (by means of speech perception test) after cochlear implantation. We evaluated surgical and audiologic results among post-lingual deafened adults, in different times of sound deprivation, and correlated with social isolation, presence of vertigo or tinnitus, and the speech therapy yield, between pre-and post-operative stages. A retrospective study was conducted on patients with post-lingual hearing loss, aged over 18 years old who underwent cochlear implant surgery in a public hospital from 2004 to 2014. Audiological, sociodemographic questionnaire, and manifestations of vertigo and tinnitus, during pre-and post-operative stages, were compared and correlating to the different periods of sound deprivation. Two groups were studied. The group A was composed of 38 participants (14 male and 24 female) with sound deprivation of less than 10 years; and group B was composed of 17 participants (8 male and 9 female) with sound deprivation longer than 10 years. We found no differences regarding age, sex, duration of sound deprivation, mean pure-tone audiometric results (pre-and post-surgery), and speech perception tests (pre-operatively). After one year of the surgery, we observed a significant difference between both groups, with a better performance to group A. The results of speech perception test, after cochlear implantation in group B, were worse than the results obtained in group A, although these correlations are not determinant whether to perform cochlear implant surgery or not.

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IntroductionP300 auditory evoked potential is evoked by a long latency auditory stimulus, which provides information on neural mechanisms underlying central auditory processing, considered an objective and non-invasive technique to study the auditory central nervous system.ObjectiveTo identify and gather scientific evidence regarding the P3 component in adult cochlear implant users.MethodsScoping review of scientific literature, in the search of original articles in Portuguese, Spanish and English, published between 1991 and May 2018, in the following database websites: PubMed / Medline, Embase, LILACS and Web of Science.ResultsA total of 87 articles were identified and exported to the search software Rayyan for study selection - 58 were from Embase, 26 from PubMed and 3 from Web of Science. There were no articles found on LILACS. From those 87 articles, 16 were excluded for being duplicated. Then 71 articles were selected for title, authors, yeas and abstract scanning, from which 50 articles were excluded. From the 21 final articles for full reading, one was excluded for not performing P300, leaving us with 20 selected articles.ConclusionThis review has contributed with evidence that indicates how important it is to include speech stimulation when measuring P300. Regardless of the stimulus being used for P300 elicitation, a pattern of results can be seen a higher latency and a lower amplitude in CI users.

BERNAL, Sarah Carolina. Hearing performance comparison between unilateral and bilateral cochlear implant users. 2019. Master thesis. Postgraduate program of rehabilitation and functional performance, RIBEIRÃO PRETO MEDICAL SCHOOL, UNIVERSITY OF SÃO PAULO. INTRODUCTION: Unilateral cochlear implant (CI) is more affordable, but presents low speech recognition and sound localization in noisy environments; on the other hand, bilateral CI demonstrates better results in speech perception and sound localization, but has higher cost and higher risks, making its benefits questionable. New studies are needed to compare both options in challenging conditions. OBJECTIVES: To evaluate adult users of unilateral and bilateral CI on speech perception in two azimuthal angles, in quiet and in ipsi and contralateral noise; to evaluate sound localization ability in four angles; to evaluate self-perception of difficulties with the CI and the ability to locate sounds on a daily basis. METHODOLOGY: The study included 60 subjects of both sexes, between 18 and 59 years, divided into 3 groups: GUunilateral CI (n=20), GBILbilateral CI (n=20), GCcontrol (n=20). Speech perception was assessed through a sentence recognition test, at 65 dB, in quiet and in noise (Speech Shaped Noise), S/N ratio of +5 dB and 0 dB. Sound localization was evaluated with two stimuli: a warble tone and the /ba/ syllable at 65 dB and 1500 Hz in four azimuthal angles. Self-perception was assessed through the APHAB questionnaire, only in the condition "with CI", as well as the Sound Localization Ability Questionnaire. RESULTS: There was difference between GUxGBIL in sound localization, APHAB, Localization Ability Questionnaire and IPRSR for all conditions, but S/N 0 dB. CONCLUSION: GBIL is the closest group to GC. Bilateral implantation showed higher performance compared to unilateral implantation.