Objective:
Evaluation of the audiological patient performance with an upgrade of the firmware from the fixed feedback canceller (FFC) to the adaptive feedback canceller (AFC) on an active middle ear implant.
Study Design:
Retrospective observational nonrandomized group study.
Setting:
Private hospital.
Patients/Intervention(s):
From March 2018 to September 2019, 15 patients implanted with an active middle ear implant, with 6 or more months of experience with a FFC system, were upgraded to an AFC algorithm.
Main Outcome Measure(s):
Functional gain, speech perception in silence and in noise, and sound localization capacities were examined. Feedback reduction was also analyzed.
Results:
Thirteen patients were analyzed. Pure tone audiometric evaluation with FFC (mean value of 48.02 dB) compared with AFC at 1 (mean value of 49.12 dB) and 6 months (mean value of 42.75 dB) revealed no statistically significant differences (p = 0.889 and p = 0.358 respectively).
In speech discrimination in silence, clinically relevant improvements were observed with AFC at 1 and 6 months, with a mean value of 41.5 and 38.3 dB, respectively (p = 0.03 and p = 0.021 correspondingly). In speech discrimination in noisy environments, we observed an improvement of the different conditions tested. No differences were found in localization capacities between FFC and AFC at the two different moments of evaluation.
Conclusions:
AFC is more effective than FFC in cancelling feedback and improving sound quality, allowing for better speech understanding in silence and in noise.
INTRODUÇÃO: A discriminação da fala no ruído tal como a interpretação musical estão entre os maiores desafios de um doente portador de um implante auditivo.O objetivo do estudo foi apresentar os testes de avaliação de discriminação da fala em ambientes com ruído e apreciar a sua utilização na prática clínica diária.MÉTODOS: Os autores propõem um protocolo de avaliação da discriminação da fala em ambientes com ruído para doentes candidatos a implantes auditivos, com o intuito de avaliar a integração da informação binaural. Foram utilizadas quatro colunas, dispostas no azimute 0°, 90°, 180° e 270°. Foi apresentada a conjugação de palavras/ frases com ruído branco ou som de cafetaria em quatro condições possíveis, sendo no global avaliados 16 parâmetros.RESULTADOS: O resultado é a percentagem de palavras e frases que o doente repete corretamente. Foi realizada a comparação pré e pós-operatória.CONCLUSÃO: Paralelamente ao estudo da localização espacial do som, considera-se que esta avaliação permitirá compreender a assimilação da informação auditiva dos doentes com implantes auditivos e avaliar a sua real integração binaural.
Although still experimental, with the possibility of adjustments in the assessment, we believe that this assessment, combined with the study of central auditory processing, will allow us to understand some central lesions, congenital or acquired hearing perception limitations.
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