Is there a change in P300 evoked potential after 6 months in cochlear implant users?

Abstract Objective: There are few studies on long-latency auditory evoked potential (P300) in people with hearing loss who use a cochlear implant. Central auditory system evaluation with behavioral and electrophysiological tests is believed to help understand the neuroplasticity mechanisms involved in auditory functioning after cochlear implant surgery. This study investigated the electrophysiological processing of cortical level acoustic signals in a group of 21 adult individuals with postlingual bilateral severe-to-profound hearing loss who were submitted to cochlear implant surgery. Methods: Data were collected in three phases: pre-cochlear implant surgery, at cochlear implant activation, and 6 months after surgery. P300 measures were also registered during all phases. Tone-burst and speech stimuli were used to elicit P300 and were presented in free field. Results: Mean P3 component latency with tone-burst and speech stimuli were 352.9 and 321.9 ms in the pre-cochlear implant phase, 364.9 and 368.7 ms in the activation phase, 336.2 and 343.6 ms 6 months after the surgery. The P3 component mean latency values using tone-burst at activation were significantly different from those 6 months after cochlear implant. They were also significantly different using speech, between pre-cochlear implant and activation phases. Lower P3 component latency occurred 6 months after cochlear implant activation with tone-burst and pre-cochlear implant with speech stimulus. There was a weak correlation between mean P3 component latency with speech stimulus and time of hearing loss. There was no difference in amplitude between phases or in the comparison with the other variables. Conclusion: There were changes in P3 component latency during the period assessed, for both speech and pure-tone stimuli, with increased latency in the activation phase and similar lower results in the two other phases, Pre-CI and 6 months after CI use. Mean amplitude measures did not vary in the three phases.

Is there a change in P300 evoked potential after 6 months in cochlear implant users?

OBJECTIVE: There are few studies on long-latency auditory evoked potential (P300) in people with hearing loss who use a cochlear implant. Central auditory system evaluation with behavioral and electrophysiological tests is believed to help understand the neuroplasticity mechanisms involved in auditory functioning after cochlear implant surgery. This study investigated the electrophysiological processing of cortical level acoustic signals in a group of 21 adult individuals with postlingual bilateral severe-to-profound hearing loss who were submitted to cochlear implant surgery. METHODS: Data were collected in three phases: pre-cochlear implant surgery, at cochlear implant activation, and 6 months after surgery. P300 measures were also registered during all phases. Tone-burst and speech stimuli were used to elicit P300 and were presented in free field. RESULTS: Mean P3 component latency with tone-burst and speech stimuli were 352.9 and 321.9 ms in the pre-cochlear implant phase, 364.9 and 368.7 ms in the activation phase, 336.2 and 343.6 ms 6 months after the surgery. The P3 component mean latency values using tone-burst at activation were significantly different from those 6 months after cochlear implant. They were also significantly different using speech, between pre-cochlear implant and activation phases. Lower P3 component latency occurred 6 months after cochlear implant activation with tone-burst and pre-cochlear implant with speech stimulus. There was a weak correlation between mean P3 component latency with speech stimulus and time of hearing loss. There was no difference in amplitude between phases or in the comparison with the other variables. CONCLUSION: There were changes in P3 component latency during the period assessed, for both speech and pure-tone stimuli, with increased latency in the activation phase and similar lower results in the two other phases, Pre-CI and 6 months after CI use. Mean amplitude measures did not vary in the three phases.

Processamento auditivo: marcadores de tempo por habilidade auditiva / Auditory processing: time markers for hearing ability

Caracterizar o tempo de aquisição de cada habilidade auditiva trabalhada em crianças diagnosticadas com Distúrbio do Processamento Auditivo Central, em idade escolar, a partir de um programa de intervenção fonoaudiológica pré-estabelecido, com duração máxima de 20 sessões. Metodologia: foram selecionados, para a intervenção fonoaudiológica, 8 indivíduos na faixa etária de sete a nove anos, em idade escolar, de uma escola pública e que completasse, no mínimo, 16 sessões de terapia, ou, ainda, aquele que atingisse os objetivos propostos (adequação das habilidades) em menor número de sessões. Para cada sessão, que ocorreu semanalmente, com duração de 40 minutos, foi realizado registro cursivo do desempenho da criança, para cada uma das habilidades trabalhadas (localização, discriminação, reconhecimento, figura-fundo/fechamento, compreensão e memória). Posteriormente, foi realizada análise do conteúdo descritivo por semelhança entre as habilidades. No registro, foi assinalada a sessão considerada como término da atividade, isto é, a aquisição da habilidade. Resultados: o número de sessões realizadas pelos indivíduos do estudo variou de 10 a 20 sessões, sendo que o tempo médio de sessões para a aquisição de cada habilidade auditiva trabalhada oscilou entre três e 16 sessões. Conclusões: foi possível observar adequação das habilidades auditivas em todos os indivíduos do estudo, com variação de tempo para cada habilidade trabalhada. Estudos com maior casuística são fundamentais para que se alcancem marcadores de tempo para aquisição de habilidades auditivas, nesse segmento populacional...

To characterize the acquisition time of each hearing ability worked with children diagnosed with Disturbance of Central Auditory Processing, school age, from a speech therapy program pre-established, which lasted 20 sessions. Methods: participated in speech therapy 8 patients aged seven to nine years, school age, in a public school. For the analysis of the dataset as a criterion for participation, the individual who completed at least 16 sessions of therapy, or one that reached the proposed objectives (adequacy of skills) in fewer sessions. For each session, which occurred weekly, lasting 40 minutes each, was conducted cursive record the child’s performance for each of the skills worked (location, discrimination, recognition, figure-ground/closing, comprehension e memory).Subsequently, we performed a descriptive content analysis of similarity between the skills. In the recordwas marked session considered the end of the activity, that is, the acquisition of skill. Results: the number of sessions held by the study subjects ranged from 10 to 20 sessions and the average length of sessions for each skill acquisition of auditory worked varied from three to 16 sessions. Conclusion: it was possible to observe adequacy in auditory skills in all subjects of the group, with a range of time worked for each skill. Studies with larger samples are essential to achieve time markers for the acquisition of auditory skills in this population segment...

Avaliação da contribuição do aparelho de amplificação sonora no espectro da neuropatia auditiva: um estudo de caso / Assessment of the hearing aids' contribution on the auditory neuropathyspectrum: a case study

Modelo do estudo: Estudo de caso. Objetivo do estudo: Verificar a contribuição da adaptação do aparelho de amplificação sonora (AAS) em duas pacientes adultas com diagnóstico de Espectro de Neuropatia Auditiva (ENA), em relação às habilidades auditivas e de comunicação. Importância do problema: Indivíduos diagnosticados com ENA apresentam sintomatologia clínica variada com queixa predominante de dificuldade de discriminação de fala, principalmente em ambientes ruidosos e, a literatura, aponta várias possibilidades de tratamento em decorrência dessas diversidades. Metodologia: Foram descritos todos os exames audiológicos, eletroacústicos, eletrofisiológicos e de imagem realizados, bem como avaliação otorrinolaringológica clínica. Participaram deste estudo duas pacientes que passaram por seleção e adaptação de AAS e foram reavaliadas após quatro e 14 meses de uso contínuo dos mesmos, mediante aplicação de teste de percepção de fala (TPF), audiometria em campo livre nas condições com e sem AAS e responderam aos questionários de auto avaliação validados (International Outcame Inventory for Hearing Aids - IOI-HA e Hearing Handicap Inventory for Adults - HHIA). Descrição dos casos: Na avaliação audiológica, ambas as pacientes apresentaram média dos limiares audiométricos dentro dos padrões de normalidade, porém no caso I observou-se limiares rebaixados a partir da frequência de 3kHz...

Model study: Case study. Objective: This study verified the contribution of the hearing aids on two adult patients diagnosed with auditory neuropathy spectrum (ANS), related to their communication and listening skills. Importance of the problem: Patients diagnosed with the ANS exhibit varied clinical symptoms with predominant complain of difficulty understanding speech, particularly in the presence of noise, and the literature suggests several possibilities of treatment due to these differences. Methodology: We described all audiological, electroacoustic, electrophysiological and imaging tests performed, as well as otorhinolaryngological evaluation. The study included two patients, who have gone through selection and adaptation with the hearing aids and were evaluated after four and fourteen months of continuous use of the device with the application of speech perception test, audiometry in free field with and without the device and they answered to the questionnaires of self-evaluation validated (International Outcame Inventory for Hearing Aids - IOI-HA e Hearing Handicap Inventory for Adults - HHIA). Description os cases: On the audiological assessment, both patients had average audiometric thresholds within normal limits, however for case 1 we observed downgraded thresholds from the frequency of 3 kHz...