Stroke in children and adolescents: Analysis of electrophysiological and behavioral assessment findings of auditory processing.

PURPOSE: This study aimed to analyze the auditory processing behavior of children and adolescents diagnosed with stroke and compare it with that of typically developing individuals. METHODS: This was an analytical cross-sectional study involving 48 participants aged between 7 and 17 years with adequate schooling for age and grade, allocated equally to two groups: Stroke (SG) and Control Groups (CG). For the SG, cases identified between 2003 and 2018 were considered. In the CG, school-aged participants with typical development were randomized. After screening for differential audiological assessment and confirmation of auditory pathway integrity at the brainstem level, binaural analyses of the auditory processing behavior were conducted using the Dichotic Digit Test (DDT), Frequency Pattern Test (FPT), and electrophysiological assessment (P300). The Shapiro-Wilk test for normality was conducted, followed by the T and Mann-Whitney tests, with a 95 % confidence level and significance offset at p < 0.05, using the SPSS software (IBM®, v. 22.) RESULTS: The CG performed better in terms of auditory processing. These differences were significant (p < 0.0001) for the binaural integration of DDT, FPT humming and Labeling, and P300 latency. The P300 results were similar; however, with a greater amplitude in the SG. CONCLUSION: This study showed that children and adolescents with stroke performed worse in electrophysiological and behavioral tests of auditory processing assessed using the auditory evoked potentials. These data reinforce the hypothesis that stroke-related lesions compromise the neural mechanisms underlying auditory processing.

Mismatch Negativity in Children and Adolescents with Autism Spectrum Disorder

Abstract Introduction Individuals with autism spectrum disorder (ASD) have abnormalities in auditory perception and sensitivity. The mismatch negativity (MMN) component of the evoked potential demonstrates a brain detection response to an auditory change due to memory, and enables the identification of changes in the auditory system. Objectives To analyze MMN responses in children and adolescents with ASD and compare them with those of a control group. Methods Cross-sectional and comparative study. The sample was composed of 68 children and adolescents, divided into study group (SG), which contained those diagnosed with ASD, and the control group (CG), which contained those with typical development, normal hearing thresholds, and without hearing complaints. All participants were submitted to peripheral and central electrophysiological auditory evaluations. For the electrophysiological auditory evaluation and MMN recording, the electrodes were fixed in the following positions: Fz (active electrode), M1 and M2 (reference electrodes), and on the forehead (ground electrode). Auditory stimuli were presented in both ears simultaneously, with a frequency of 1,000 Hz for the frequent stimulus, and of 2,000 Hz for the rare stimulus, in an intensity of 80 dBNA. Results Latency and amplitude values were increased in the SG, with a statistically significant difference in comparison with the CG. In the MMN analysis, there was no statistically significant difference in the comparison between right and left ears and between genders. Conclusions Children and adolescents with ASD had higher latency and amplitude values in the MMN component than the individuals in the CG.

Mismatch Negativity in Children and Adolescents with Autism Spectrum Disorder.

Introduction Individuals with autism spectrum disorder (ASD) have abnormalities in auditory perception and sensitivity. The mismatch negativity (MMN) component of the evoked potential demonstrates a brain detection response to an auditory change due to memory, and enables the identification of changes in the auditory system. Objective To analyze MMN responses in children and adolescents with ASD and compare them with those of a control group. Methods Cross-sectional and comparative study. The sample was composed of 68 children and adolescents, divided into study group (SG), which contained those diagnosed with ASD, and the control group (CG), which contained those with typical development, normal hearing thresholds, and without hearing complaints. All participants were submitted to peripheral and central electrophysiological auditory evaluations. For the electrophysiological auditory evaluation and MMN recording, the electrodes were fixed in the following positions: Fz (active electrode), M1 and M2 (reference electrodes), and on the forehead (ground electrode). Auditory stimuli were presented in both ears simultaneously, with a frequency of 1,000 Hz for the frequent stimulus, and of 2,000 Hz for the rare stimulus, in an intensity of 80 dBNA. Results Latency and amplitude values were increased in the SG, with a statistically significant difference in comparison with the CG. In the MMN analysis, there was no statistically significant difference in the comparison between right and left ears and between genders. Conclusion Children and adolescents with ASD had higher latency and amplitude values in the MMN component than the individuals in the CG.

Achados audiológicos na síndrome de Rubinstein-Taybi: revisão sistemática / Audiological findings in Rubinstein-Taybi syndrome: literature review

Objetivo: Verificar os achados audiológicos em sujeitos portadores da Síndrome de Rubinstein-Taybi (SRT) através de uma busca sistemática na literatura. Métodos: Foram utilizados os descritores "Rubinstein Taybi Syndrome" AND "Hearing" nas principais bases de dados. O levantamento limitou-se a publicações realizadas até junho de 2020, sem limitação de idioma. Foram incluídos todos os estudos que envolvessem avaliações auditivas realizadas em sujeitos portadores da SRT. Foram excluídos da análise, estudos que envolvessem população não portadora de SRT, cartas ao editor e estudos nos quais não foram encontrados os artigos originais. Resultados: A pesquisa resultou na seleção de cinco artigos que evidenciaram que não há uma padronização nos testes audiológicos devido à heterogeneidade das características encontradas na SRT. A perda auditiva do tipo condutiva foi amplamente relatada, porém não foi possível verificar se há um perfil audiológico nesta população. Conclusão: Verificou-se que poucos estudos avaliaram a audição dos portadores de SRT. Além disso, foi possível observar que ainda não são padronizados os testes audiológicos. Recomenda-se que sejam realizados mais estudos com amostras maiores a fim de conhecer quais são as alterações audiológicas mais comuns de modo que se indique precocemente a intervenção terapêutica mais adequada.

Stroke in children and adolescents: Analysis of electrophysiological and behavioral assessment findings of auditory processing

Abstract Purpose: This study aimed to analyze the auditory processing behavior of children and adolescents diagnosed with stroke and compare it with that of typically developing individuals. Methods: This was an analytical cross-sectional study involving 48 participants aged between 7 and 17 years with adequate schooling for age and grade, allocated equally to two groups: Stroke (SG) and Control Groups (CG). For the SG, cases identified between 2003 and 2018 were considered. In the CG, school-aged participants with typical development were randomized. After screening for differential audiological assessment and confirmation of auditory pathway integrity at the brainstem level, binaural analyses of the auditory processing behavior were conducted using the Dichotic Digit Test (DDT), Frequency Pattern Test (FPT), and electrophysiological assessment (P300). The Shapiro-Wilk test for normality was conducted, followed by the T and Mann-Whitney tests, with a 95 % confidence level and significance offset at p < 0.05, using the SPSS software (IBM®, v. 22.) Results: The CG performed better in terms of auditory processing. These differences were significant (p < 0.0001) for the binaural integration of DDT, FPT humming and Labeling, and P300 latency. The P300 results were similar; however, with a greater amplitude in the SG. Conclusion: This study showed that children and adolescents with stroke performed worse in electrophysiological and behavioral tests of auditory processing assessed using the auditory evoked potentials. These data reinforce the hypothesis that stroke-related lesions compromise the neural mechanisms underlying auditory processing.

Treinamento auditivo cognitivo em sujeitos após COVID-19: uma análise dos efeitos da intervenção em adultos / Cognitive auditory training in subjects after COVID-19: an analysis of the effects of the intervention in adults

RESUMO Objetivo analisar a eficácia de um plano de intervenção terapêutica por meio de um programa de treinamento auditivo cognitivo já existente, adaptado para adultos, após um ano de infecção por COVID-19. Métodos participaram do estudo 13 sujeitos, entre 18 e 59 anos de idade, quatro do gênero masculino e nove do gênero feminino. Todos foram submetidos a um questionário, inspeção visual do meato acústico externo, audiometria tonal liminar, logoaudiometria e medidas de imitância acústica, como procedimentos de seleção. Foram realizados, na avaliação e na reavaliação, os seguintes procedimentos: avaliação do processamento auditivo central, avaliação neuropsicológica breve-NEUPSILIN, Speech, Spatial and Qualities of Hearing Scale e o Potencial Cognitivo - P300, com estímulo de fala. O treinamento auditivo cognitivo foi realizado em seis sessões consecutivas, em campo aberto, com duração de, aproximadamente, 50 minutos. Em todas as análises foi considerado o nível de significância de 5% (p≤0,05). Resultados na comparação das variáveis entre os períodos, pré e pós-intervenção, houve diferença estatisticamente significativa no Teste Dicótico de Dígitos (p = 0,009), no Teste Padrão de Frequência (p = 0,020) e no Speech, Spatial and Qualities of Hearing Scale (p = 0,001). Houve tendência à significância (p < 0,10) no teste Gap in Noise e na Atenção Total. Conclusão o treinamento auditivo cognitivo demonstrou ser uma estratégia terapêutica eficaz para o tratamento de adultos com queixas de compreensão de fala e de cognição após infecção por COVID-19.

ABSTRACT Purpose To analyze the effectiveness of a therapeutic intervention plan through an existing cognitive auditory training program, adapted for adults, after one year of COVID-19 infection. Methods 13 subjects, between 18 and 59 years old, four males and nine females participated in the study. All underwent anamnesis, visual inspection of the external acoustic meatus, pure tone audiometry, speech audiometry and acoustic immitance measurements as selection procedures. For the research, the following procedures were carried out in the evaluation and reassessment: evaluation of central auditory processing, brief neuropsychological evaluation - NEUPSILIN, Speech, Spatial and Qualities of Hearing Scale and the Cognitive Potential - P300 with speech stimulus. Cognitive auditory training was carried out in six consecutive sessions, in an open field, lasting approximately 50 minutes. In all analyses, a significance level of 5% (p≤0.05) was considered. Results When comparing the variables between the periods, pre and post intervention, there was a statistically significant difference in the Dichotic Digit Test (p = 0.009), in the Frequency Pattern Test (p = 0.020) and in Speech, Spatial and Qualities of Hearing Scale (p = 0.001). And a tendency to significance (p < 0.10) in the Gap in Noise test and Total Attention. Conclusion Cognitive auditory training proved to be an effective therapeutic strategy for the treatment of adults with speech comprehension and cognition complaints after COVID-19 infection.

Cortical auditory-evoked potential as a biomarker of central auditory maturation in term and preterm infants during the first 3 months.

OBJECTIVES: To analyze central auditory maturation in term and preterm infants during the first 3 months of life by comparing the latency and amplitude of cortical auditory-evoked potential at different frequencies. METHODS: In this study, 17 term and 18 preterm infants were examined; all had tested positive on the neonatal hearing screening test. Cortical auditory potential was investigated during the first and third months of life. The response of the cortical auditory-evoked potential was investigated at frequencies of 500, 1000, 2000, and 4000 Hz. The latency and amplitude of the cortical response were automatically detected and manually analyzed by three researchers with experience in electrophysiology. The results were compared using analysis of variance and the Bonferroni test. A significance level of 5% was used for all analyses. RESULTS: Latency values of cortical auditory-evoked potential in the first month of birth were significantly higher than those in the third month, and latency values of the preterm group were higher than those of the term group, regardless of the frequency and time of evaluation. In general, the latency of the cortical auditory-evoked potential was higher at high frequencies. Amplitude values in the third month of life were significantly higher than those in the first month for term and preterm infants. CONCLUSION: Central auditory maturation was observed in both groups but with different results between those born at term and preterm, with latencies of cortical auditory-evoked potential higher for the preterm group and at high frequencies.

Potencial evocado auditivo Mismatch Negativity em músicos adultos / Mismatch Negativity auditory evoked potentials in adult musicians / Potencial evocado auditivo Mismatch Negativity en músicos adultos

Introdução: Mismatch Negativity (MMN) é um exame objetivo que não depende da realização de tarefas nem da atenção do sujeito. Tem sido utilizado para estudar o processamento auditivo relacionado à detecção automática de mudanças auditivas. Objetivo: Analisar latências e amplitudes do MMN em músicos adultos e comparar os resultados com um grupo controle de não músicos normouvintes. Método: Estudo transversal e comparativo. A amostra foi composta por 69 sujeitos, 40 sujeitos não músicos (grupo controle) e 29 sujeitos músicos (grupo estudo) todos com no mínimo três anos de experiência musical e idades superiores a 18 anos. Todos realizaram avaliação auditiva periférica e o MMN. Resultados: A média das latências e amplitudes do grupo controle foram, respectivamente, 173,61ms (±49.80) e 4,25µV (±3.60) e do grupo estudo foram, respectivamente, 144,23ms (±17.58) e 5,12µV (±2.73). Houve diferença estatisticamente significante entre os grupos por orelha (p<0,05), sendo a média das latências e amplitudes do grupo estudo de 140,08ms na orelha direita e 148,37ms na orelha esquerda, e 4,83µV na orelha direita e 5,41µV na orelha esquerda. Conclusão: O grupo de músicos apresentou melhores resultados, como menor latência e maior amplitude do MMN, evidenciando melhor processamento do estímulo acústico em nível central.

Introduction: Mismatch Negativity (MMN) is an objective exam that does not depend on the subjects' task performance or attention. It is regularly used to study auditory processing relative to the automatic detection of auditory changes. Objective: To analyze the latencies and amplitudes of MMN in adult musicians and compare the results with those of the control group of normal hearing non-musicians. Methods: This is a cross sectional and comparative study. The sample consisted of 69 subjects, aged between 18 and 59 years, with 40 non-musician subjects (control group) and 29 musicians (study group) with at least 3 years of musical expertise, and ages over 18 years. All patients were assessed by peripheral auditory evaluation and MMN. Results: The mean latencies and amplitudes were 173.61 ms (±49.80) and 4.25µV (±3.60) in the control group, and 144.23 ms (±17.58) and 5.12µV (±2.73) in the study group. There was a significant difference between the groups per ear (p<0.05), and the mean latencies and amplitudes in the study group were 140.08 ms in the right ear and 148.37 ms in the left while the values of amplitude were 4.83µV in the right ear and 5.41µV in the left ear. Conclusion: The musicians presented better results for MMN, such as lower latency and greater amplitude, showing evidence of improved acoustic stimulus processing at the central level.

Introduccion: Mismatch Negativity (MMN) es un examen objetivo que no depende del desempeño de las tareas ni de la atención del sujeto. Se há utilizado para estudiar el procesamiento auditivo relacionado com la detección automática de câmbios auditivos. Objetivo: Analizar las latencias y amplitudes del MMN en músicos adultos y comparar los resultados con un grupo de control de músicos normales. Metodos: Estudio transversal y comparativo. La muestra estuvo compuesta por 69 sujetos, 40 sujetos no musicales (grupo de control) y 29 sujetos músicos (grupo de estudio) todos con al menos tres años de experiencia musical y mayores de 18 años. Todos se sometieron a evaluación de audición periférica y MMN. Resultados: El promedio de las latencias y amplitudes del grupo control fueron, respectivamente, 173.61ms (± 49.80) y 4.25µV (± 3.60) y del grupo de estudio, respectivamente, 144.23ms (± 17.58) y 5.12 µV (± 2,73). Hubo una diferencia estadísticamente significativa entre los grupos por oído (p <0.05) y el promedio de las latencias y amplitudes del grupo estudiado fue de 140.08ms en el oído derecho y 148.37ms en el oído izquierdo, y 4.83µV en el oído derecho y 5 .41 µV en el oído izquierdo. Conclusión: El grupo de músicos presentó mejores resultados, como menor latencia y mayor amplitud MMN, mostrando un mejor procesamiento del estímulo acústico a nivel central.

Suscetibilidade à cinetose em crianças de oito a onze anos / Susceptibilidad al cinetosis en niños de 8 a 12 años de edad / Susceptibility to motion sickness in children from eight to eleven years of age

RESUMO A cinetose se caracteriza pela intolerância ao movimento, resultante de um conflito sensorial entre os sistemas visual, proprioceptivo e vestibular. Na população infantil, a cinetose é frequente, porém o difícil diagnóstico acaba subestimando a prevalência nesse grupo específico. As alterações vestibulares pediátricas têm importante influência no desenvolvimento infantil. O objetivo do artigo foi analisar a suscetibilidade à cinetose em crianças e verificar possíveis fatores associados, bem como identificar diferenças entre as respostas, quando comparados os sexos, as faixas etárias e a autopercepção dos pais. Trata-se de um estudo transversal. A amostra de conveniência consecutiva foi constituída por crianças de ambos os sexos, com idade entre oito e onze anos. Para avaliar a suscetibilidade à cinetose, foi aplicado o motion sickness questionnaire short form (MSSQ), realizado individualmente com cada criança. A análise estatística foi realizada por meio do SPSS Versão v.21. Adotou-se nível de significância de 0,05. Utilizaram-se os testes estatísticos Kolmogorov-Smirnov; T de Student; Anova e teste de Friedman. Ao total, foram analisadas 223 crianças. Observou-se que 89,7% das crianças avaliadas eram suscetíveis à cinetose. Houve diferença significativa na comparação da suscetibilidade à cinetose entre os sexos, sendo as meninas, mais suscetíveis em relação aos meninos (p=0,001). Na comparação entre as faixas etárias, não houve significância estatística. Crianças com onze anos apresentaram maior suscetibilidade à cinetose. Houve diferença nas respostas relatadas pelas crianças e pais sobre a suscetibilidade das crianças à cinetose.

RESUMEN El cinetosis es la intolerancia al movimiento pasivo, resultado de un conflicto sensorial entre los sistemas visual, propioceptivo y vestibular. La población infantil padece con frecuencia del cinetosis, pero su prevalencia se subestima debido al difícil diagnóstico en este grupo específico. Los trastornos vestibulares en niños influyen significativamente en su desarrollo. El objetivo de este artículo fue analizar la susceptibilidad al cinetosis en niños y sus factores asociados, así como identificar las diferencias entre las respuestas en la comparación entre los sexos, los grupos de edad y la autopercepción de los padres. Se trata de un estudio transversal. La muestra de conveniencia consecutiva estuvo compuesta de niños de ambos sexos, con edades comprendidas entre 8 y 12 años. Para evaluar la susceptibilidad al cinetosis, se aplicó el motion sickness questionnaire short form (MSSQ) de manera individual en cada niño. Para el análisis estadístico se utilizó el software SPSS, versión 21.0. El nivel de significancia adoptado fue de 0,05. Se utilizaron pruebas estadísticas de Kolmogorov-Smirnov; T de Student; Anova y test de Friedman. Participaron en total 223 niños. Se observó que el 89,7% de los niños evaluados eran susceptibles al cinetosis. Hubo una diferencia significativa en la comparación de la susceptibilidad al cinetosis entre los sexos, en la cual las niñas eran más susceptibles que los niños (p=0,001). En cuanto a los grupos de edad, no hubo significación estadística. Los niños de 12 años fueron más susceptibles al cinetosis. Hubo una diferencia en las respuestas informadas por los niños y los padres sobre la susceptibilidad de los niños al cinetosis.

ABSTRACT Motion sickness is characterized by intolerance to movement, resulting from a sensory conflict between the visual, proprioceptive and vestibular systems. In the child population, motion sickness is frequent, but the difficult diagnosis ends up underestimating the prevalence in this specific group. Pediatric vestibular changes are of great importance in child development. The objective was to analyze the susceptibility to motion sickness in children and to verify possible associated factors, as well as to identify differences in the responses when compared to sex, age group and parents' self-perception. This is a cross-sectional study. The consecutive convenience sample consisted of children of both sexes, aged between eight and eleven years old. The motion sickness questionnaire short form (MSSQ) was applied individually with each child. Statistical analysis was performed using the SPSS Version v.21 (Chicago: SPSS). A significance level of 0,005 was adopted. Kolmogorov-Smirnov, Student's T, Anova and Friedman's were the statistical tests used. In total, 223 children were analyzed. 89.7% of the sample was susceptible to motion sickness. There was a significant difference in the comparison of susceptibility to motion sickness between genders, with girls being more susceptible, compared to boys (p=0.001). When comparing age groups, there was no statistical significance. Eleven-year-old children were more susceptible to motion sickness. There was a difference in the responses reported by children and parents about the children's susceptibility to motion sickness.

Central auditory processing: behavioral and electrophysiological assessment of children and adolescents diagnosed with stroke.

INTRODUCTION: Central auditory processing refers to the efficiency and effectiveness with which the central nervous system uses auditory information: it may be altered in neurological disorders and brain injuries, such as strokes. However, despite evidence of probable alterations in the pediatric population, functional abilities and post-stroke limitations are still not well documented in the literature. OBJECTIVE: To analyze the findings of the electrophysiological and behavioral evaluations of central auditory processing of children and adolescents diagnosed with stroke from a reference outpatient clinic, as well as to investigate possible associations with the variables: type and location of the stroke and age group. METHODS: The present study is characterized as comparative cross-sectional. The sample, for convenience, included individuals aged 7-18 years divided into two groups: study group, composed of individuals with a diagnosis of stroke, and control group, composed of individuals with typical development. The evaluation consisted of the following procedures: anamnesis, basic audiological evaluation, behavioral evaluation of the auditory processing disorder (dichotic digit test, dichotic consonant-vowel, synthetic sentence identification/pediatric speech intelligibility, gaps in noise, pitch pattern sequence, masking level difference), and electrophysiological evaluation (P300 and mismatch negativity). RESULTS: Nineteen children and adolescents were included in the study group. The control group was composed of 19 children and adolescents with typical development. In the comparison between the groups, a worse performance is observed for the study group in all the evaluated tests, behavioral and electrophysiological. In the behavioral evaluation of central auditory processing, there was a statistical difference for all tests, except for masking level difference and dichotic digit test, binaural separation step on the left. In the electrophysiological evaluation, there was a statistical difference in the latency of mismatch negativity and P300. No associations were found between the behavioral and electrophysiological findings and the location of the stroke and age group variables. CONCLUSION: Children and adolescents diagnosed with stroke present a worse performance in the electrophysiological and behavioral evaluations of central auditory processing when compared to a control group.

Cortical auditory-evoked potential as a biomarker of central auditory maturation in term and preterm infants during the first 3 months

OBJECTIVES: To analyze central auditory maturation in term and preterm infants during the first 3 months of life by comparing the latency and amplitude of cortical auditory-evoked potential at different frequencies. METHODS: In this study, 17 term and 18 preterm infants were examined; all had tested positive on the neonatal hearing screening test. Cortical auditory potential was investigated during the first and third months of life. The response of the cortical auditory-evoked potential was investigated at frequencies of 500, 1000, 2000, and 4000 Hz. The latency and amplitude of the cortical response were automatically detected and manually analyzed by three researchers with experience in electrophysiology. The results were compared using analysis of variance and the Bonferroni test. A significance level of 5% was used for all analyses. RESULTS: Latency values of cortical auditory-evoked potential in the first month of birth were significantly higher than those in the third month, and latency values of the preterm group were higher than those of the term group, regardless of the frequency and time of evaluation. In general, the latency of the cortical auditory-evoked potential was higher at high frequencies. Amplitude values in the third month of life were significantly higher than those in the first month for term and preterm infants. CONCLUSION: Central auditory maturation was observed in both groups but with different results between those born at term and preterm, with latencies of cortical auditory-evoked potential higher for the preterm group and at high frequencies.

Cortical auditory evoked potential in assessment of neonates: a study about minimum level of responses in term and preterm newborns / Potencial evocado auditivo cortical na avaliac¸ão de neonatos: um estudo sobre o nível mínimo de respostas em nascidos a termo e pré-termos

Abstract Introduction: The study of the threshold level of cortical auditory response in adults has been investigated in previous studies. Due to maturational issues, little is known about these responses in neonates. Technological advances with automatic analysis devices now allow investigation in specific populations. Thus, new studies are needed to establish the feasibility of using this auditory potential to identify the lowest levels of responses in children. Objective: Verify and compare latency and amplitude in 80 dBnNA and the minimum level of cortical auditory response in term and preterm neonates. Methods: A cross-sectional, comparative study involving 59 neonates, 35 full-term births and 24 preterm births, with positive results in the Neonatal Hearing Screening. The Hearlab system was used to investigate the P1i auditory potential with tone burst stimulus at frequencies of 500, 1000, 2000 and 4000 Hz. The minimum response level search ranged from 80 to 0 dBNA and was detected automatically. The results were compared between groups, evaluating the latency and amplitude in 80 dBNA and the minimum level of cortical auditory response. Results: The mean values obtained for the minimum level of cortical auditory response in term group were 26 ± 8.81; 26.14 ± 6.97; 29 ± 7.65 and 29.43 ± 7.04 dBNA and for preterm neonates of 31.96 ± 10.41; 34.13 ± 11.34; 33.64 ± 11.03 and 37.73 ± 11.92 dBNA, for the frequencies of 500, 1000, 2000 and 4000 Hz, respectively. There was a difference between groups for the latency of P1i at 4000 Hz and the minimum response levels at 500, 1000 and 4000 Hz, with higher values for preterm infants. Conclusion: It was possible to obtain latency and amplitude values at 80 dBnNA and the minimum level of cortical response in term and preterm newborns, with different results between groups, with higher values in those born preterm.

Resumo Introdução: A investigação do nível mínimo de resposta auditiva cortical tem sido alvo de diferentes estudos em adultos. Devido a questões de maturação, pouco se sabe sobre essas respostas em recém-nascidos. Com o avanço tecnológico, dispositivos de análise automática surgiram com o objetivo de retomar essa avaliação em populações específicas. Assim, novos estudos são necessários para verificar a viabilidade do uso desse potencial auditivo na obtenção de níveis mínimos de respostas na criança. Objetivo: Verificar e comparar latência e amplitude em 80 dBnNA e o nível mínimo de resposta auditiva cortical em recém-nascidos a termo e pré-termo. Método: Estudo transversal, comparativo, envolvendo 59 neonatos, 35 nascidos a termo e 24 pré-termos, com resultados positivos na triagem auditiva neonatal. O sistema Hearlab foi utilizado para investigar o potencial auditivo P1i com estímulo tone burst nas frequências de 500, 1000, 2000 e 4000 Hz. A busca do nível mínimo de resposta variou de 80 a 0 dBNA e foi detectado automaticamente. Os resultados foram comparados entre os grupos, avaliando a latência e amplitude em 80 dBNA e o nível mínimo de resposta auditiva cortical. Resultados: Os valores médios obtidos para o nível mínimo de resposta auditiva cortical no grupo nascido a termo foram 26 ± 8,81; 26,14 ± 6,97; 29 ± 7,65 e 29,43 ± 7,04 dBNA e para recém-nascidos pré-termos foram de 31,96 ± 10,41; 34,13 ± 11,34; 33,64 ± 11,03 e 37,73 ± 11,92 dBNA, para as frequências de 500, 1000, 2000 e 4000 Hz, respectivamente. Houve diferenc¸a entre os grupos para a latência de P1i em 4000 Hz e os níveis mínimos de resposta em 500, 1000 e 4000 Hz, com valores maiores em Pré-termos. Conclusão: Foi possível obter valores de latência e amplitude em 80 dBnNA e o nível mínimo de resposta cortical em recém-nascidos a termo e Pré-termos, com resultados diferentes entre osgrupos, com valores maiores em pré-termos.

Hyperbilirubinemia impact on newborn hearing: a literature review.

The increase in bilirubin levels in newborns can cause toxic effects on the auditory system, which can lead to hearing loss. This review aimed to verify the impact of hyperbilirubinemia in the hearing of newborns, relating audiological findings to serum levels of bilirubin. A literature review was conducted during October 2017, using the terms "hyperbilirubinemia", "jaundice", "infant", "newborn" and "hearing loss", on databases CAPES journals, MEDLINE and BIREME (SciELO, BBO). 827 studies were identified and 59 were selected for full-text reading, resulting in the selection of seven articles that met the inclusion criteria and were considered relevant to the sample of this study. All the reviewed studies performed brainstem auditory evoked potential as the main test for audiological evaluation. Changes in the audiological findings of neonates with hyperbilirubinemia were observed in all studies. There was no consensus on the serum bilirubin levels that may cause auditory changes; however, the relationship between hearing disorders and blood levels of bilirubin was positive. We identify the need to establish reference values for bilirubin levels considered critical for the occurrence of hearing disorders as well as the audiological follow-up of neonates with hyperbilirubinemia.

Comparison between click and ce-chirp® stimuli in neonatal hearing screening / Comparação dos estímulos clique e ce-chirp® na triagem auditiva neonatal

BACKGROUNG:OBJECTIVE: To compare the application time of the Automated Auditory Brainstem Response (A-ABR) between the click and CE-Chirp® stimuliMETHODS: Forty-six newborns were evaluated without risk indicators for hearing loss and presenting transient evoked otoacoustic emissions (TEOAE). The A-ABR was performed with Interacoustics® Titan equipment in a hospital, with the click and CE-Chirp® stimuli at the same time. Descriptive statistical analyses and inferential statistics analyses (Student's t-test calculation for mean comparisons among independent samples) were used for the variables age, gender, examination time, laterality and test stimulus usedRESULTS: Of the 46 neonates in the sample, 23 were male and 23 female. The mean age of the sample was 23.1 days. The mean procedure time using the Click stimulus was 85.9 seconds for the right ear and 86.1 seconds for the left ear, whereas for the use of the CE-Chirp® stimulus the results obtained for the right and left ear were28.4 seconds and 27.9 seconds, respectively. There was a statistically significant difference between the mean times obtained through the CE-Chirp® and Click stimuli for both ears (p=0.000). There was no statistically significant difference in the comparison between the right and left ears or between females and malesCONCLUSION: It was found that the mean duration of the A-ABR procedure using the CE- Chirp® stimulus is three times lower than with the Click stimulus

INTRODUÇÃO:OBJETIVO: Comparar o tempo de aplicação do Potencial Evocado Auditivo de Tronco Encefálico Automático (PEATE-A) entre os estímulos clique e CE-Chirp®MÉTODO: Foram avaliados 46 recém-nascidos sem indicadores de risco para perda auditiva e que apresentavam emissões otoacústicas evocadas por estímulo transiente (EOAT) presentes. O PEATE-A foi realizado com o equipamento Titan da Interacoustics® em ambiente hospitalar, com os estímulos clique e CE-Chirp®na mesma ocasião. As análises estatísticas descritivas e análises estatísticas inferenciais (cálculo do teste t de Studentpara comparações de médias entre amostras independentes) foram utilizadas para as variáveis idade, gênero, tempo de exame, lateralidade e estímulo de teste utilizadoRESULTADOS: Dos 46 recém-nascidos da amostra, 23 são do sexo masculino e 23 do sexo feminino. A idade média da amostra foi de 23,1 dias. O tempo médio do procedimento usando o estímulo clique foi de 85,9 segundos para a orelha direita e 86,1 segundos para a orelha esquerda, enquanto que para o uso do estímulo CE-Chirp®foram obtidos resultados para a orelha direita e esquerda de 28,4 segundos e 27,9 segundos respectivamente. Houve diferença estatisticamente significante entre os tempos médios obtidos por meio dos estímulos CE-Chirp® e Clique para ambas as orelhas (p=0,000). Não houve diferença estatisticamente significante na comparação entre as orelhas direita e esquerda ou entre o sexo feminino e masculinoCONCLUSÃO: Verificou-se que o tempo médio de realização do procedimento PEATE-A com uso do estímulo CE-Chirp® é três vezes menor do que com estímulo Clique

Long-latency auditory evoked potential in children with stuttering.

OBJECTIVE: To analyze the latency and the amplitude values of Mismatch Negativity and P300 cognitive potential in children with stuttering, with no auditory complaints, with auditory thresholds within the normality range, comparing them to the findings of a Control Group. METHODS: A cross-sectional study involving 50 children of both sexes, 15 with stuttering and 35 without stuttering, aged 6 to 11 years, with no diagnosis of ear pathology or other diseases. All children were submitted to peripheral audiological evaluation (meatoscopy, pure tone testing, speech audiometry, and acoustic immittance measures) and a central audiological evaluation (investigation of the Mismatch Negativity and P300 cognitive potential). For the evaluation of fluency, all children with stuttering had a specific history taken and were video recorded in a spontaneous speech. Afterwards, the transcription was done, followed by speech analysis to classify children according the severity of stuttering. RESULTS: There was a significant difference in the latencies of Mismatch Negativity and P300 cognitive potential, as well as in the amplitude of Mismatch Negativity. CONCLUSION: There was a significant delay in the latencies of Mismatch Negativity and P300 cognitive potential, as well as increase in the amplitude of the Mismatch Negativity in children with stuttering when compared to children in the Control Group. Changes in the morphology of the waves were found in the Stuttering Group.

Mismatch negativity in children with complaints of learning difficulties / Mismatch Negativity en niños con quejas de dificultades de aprendizaje

INTRODUCTION: Mismatch Negativity (MMN) is an electrophysiological measure of hearing that reflects the skills of auditory discrimination and central auditory processing. OBJECTIVE: To analyze MMN results in children with complaints of learning difficulties and to compare the results with children without complaints of learning difficulties. MATERIALS AND METHODS: Cross-sectional and comparative study. The sample consisted of 105 male and female children, aged between 8 and 11 years and 11 months, 3rd to 5th graders at Elementary School. The study group consisted of 35 children with learning difficulties and the control group, of 70 children without complaints. All children underwent pure-tone threshold audiometry (PTTA), vocal audiometry, acoustic immittance measurements and Mismatch Negativity (MMN) evaluations. RESULTS: The mean latency of MMN was 213.3ms in the right ear and 215.2ms in the left in the study group, and 169.3ms in the right ear and 170.4ms in the left in the control group. The mean MMN latency was significantly higher in the study group compared to the control group (p<.001). The mean amplitude of MMN in the study group was 5.76μV in the right ear and 5.62μV in the left, while in the control it was 5.01μV in the right ear and 5.22μV in the left. CONCLUSIONS: In the study sample, children with complaints of learning difficulties had significantly higher mean significances than those without the same complaints

ANTECEDENTES Y OBJETIVO: La Mismatch Negativity (MMN) es una medida electrofisiológica de la audición que refleja las habilidades de discriminación auditiva y el procesamiento auditivo central. El objetivo de este estudio fue analizar los resultados de la MMN en los niños con quejas de dificultades de aprendizaje, y comparar los resultados con niños sin quejas de dificultades de aprendizaje. MATERIALES Y MÉTODOS: Estudio transversal y comparativo. La muestra fue constituida por 105 niños de ambos sexos, con edad comprendidas entre 8 y 11 años y 11 meses, 3.ª a 5.ª series de la enseñanza fundamental. El grupo de estudio fue constituido por 35 niños con dificultades de aprendizaje y el grupo control, de 70 niños sin quejas. Todos los niños fueron sometidos a la audiometría tonal liminar (PTTA), a la audiometría vocal, a las medidas de imitancia acústica y a la MMN. RESULTADOS: La latencia media de la MMN fue de 213,3ms en el oído derecho y 215,2ms en el izquierdo en el grupo de estudio, y 169,3ms en el oído derecho y 170,4ms en el izquierdo en el grupo control. La latencia media de la MMN fue significativamente mayor en el grupo de estudio en comparación con el grupo control (p < 0,001). La amplitud media de la MMN en el grupo de estudio fue de 5,76μV en el oído derecho y de 5,62μV en el oído izquierdo, mientras que en el control fue de 5,01μV en el oído derecho y 5,22μV en el oído izquierdo. CONCLUSIONES: En la muestra estudiada, los niños con quejas de dificultades de aprendizaje tuvieron significados significativamente mayores que aquellas sin las mismas quejas

Cortical auditory evoked potential in assessment of neonates: a study about minimum level of responses in term and preterm newborns.

INTRODUCTION: The study of the threshold level of cortical auditory response in adults has been investigated in previous studies. Due to maturational issues, little is known about these responses in neonates. Technological advances with automatic analysis devices now allow investigation in specific populations. Thus, new studies are needed to establish the feasibility of using this auditory potential to identify the lowest levels of responses in children. OBJECTIVE: Verify and compare latency and amplitude in 80dBnNA and the minimum level of cortical auditory response in term and preterm neonates. METHODS: A cross-sectional, comparative study involving 59 neonates, 35 full-term births and 24 preterm births, with positive results in the Neonatal Hearing Screening. The Hearlab system was used to investigate the P1i auditory potential with tone burst stimulus at frequencies of 500, 1000, 2000 and 4000Hz. The minimum response level search ranged from 80 to 0dBNA and was detected automatically. The results were compared between groups, evaluating the latency and amplitude in 80dBNA and the minimum level of cortical auditory response. RESULTS: The mean values obtained for the minimum level of cortical auditory response in term group were 26±8.81; 26.14±6.97; 29±7.65 and 29.43±7.04dBNA and for preterm neonates of 31.96±10.41; 34.13±11.34; 33.64±11.03 and 37.73±11.92dBNA, for the frequencies of 500, 1000, 2000 and 4000Hz, respectively. There was a difference between groups for the latency of P1i at 4000Hz and the minimum response levels at 500, 1000 and 4000Hz, with higher values for preterm infants. CONCLUSION: It was possible to obtain latency and amplitude values at 80dBnNA and the minimum level of cortical response in term and preterm newborns, with different results between groups, with higher values in those born preterm.

Long-latency auditory evoked potential in children with stuttering / Potenciais evocados auditivos de longa latência em crianças com gagueira

ABSTRACT Objective To analyze the latency and the amplitude values of Mismatch Negativity and P300 cognitive potential in children with stuttering, with no auditory complaints, with auditory thresholds within the normality range, comparing them to the findings of a Control Group. Methods A cross-sectional study involving 50 children of both sexes, 15 with stuttering and 35 without stuttering, aged 6 to 11 years, with no diagnosis of ear pathology or other diseases. All children were submitted to peripheral audiological evaluation (meatoscopy, pure tone testing, speech audiometry, and acoustic immittance measures) and a central audiological evaluation (investigation of the Mismatch Negativity and P300 cognitive potential). For the evaluation of fluency, all children with stuttering had a specific history taken and were video recorded in a spontaneous speech. Afterwards, the transcription was done, followed by speech analysis to classify children according the severity of stuttering. Results There was a significant difference in the latencies of Mismatch Negativity and P300 cognitive potential, as well as in the amplitude of Mismatch Negativity. Conclusion There was a significant delay in the latencies of Mismatch Negativity and P300 cognitive potential, as well as increase in the amplitude of the Mismatch Negativity in children with stuttering when compared to children in the Control Group. Changes in the morphology of the waves were found in the Stuttering Group.

RESUMO Objetivo Analisar os valores de latência e amplitude do Mismatch Negativity e potencial cognitivo P300 em crianças com gagueira, sem queixas auditivas, com limiares auditivos dentro dos padrões de normalidade, comparando aos achados de um Grupo Controle. Métodos Estudo transversal, do qual participaram 50 crianças de ambos os sexos, sendo 15 com gagueira e 35 sem gagueira, entre 6 e 11 anos de idade, sem diagnóstico de patologias otológicas ou outras doenças. Todas as crianças realizaram avaliação audiológica periférica (meatoscopia, audiometria tonal, audiometria vocal e medidas de imitância acústica) e avaliação audiológica central (Mismatch Negativity e potencial cognitivo P300). Para avaliação da fluência, as crianças com gagueira realizaram anamnese específica, seguida da filmagem de uma fala espontânea, que foi transcrita e analisada quanto à severidade da gagueira. Resultados Houve diferença significativa nas latências do Mismatch Negativity e do potencial cognitivo P300, assim como na amplitude do Mismatch Negativity. Conclusão Verificou-se atraso nas latências do Mismatch Negativity e potencial cognitivo P300 nas crianças com gagueira, assim como aumento na amplitude do Mismatch Negativity, ao serem comparados com crianças do Grupo Controle. No Grupo com Gagueira foram igualmente identificadas alterações na morfologia das ondas.

Hyperbilirubinemia impact on newborn hearing: a literature review

SUMMARY The increase in bilirubin levels in newborns can cause toxic effects on the auditory system, which can lead to hearing loss. This review aimed to verify the impact of hyperbilirubinemia in the hearing of newborns, relating audiological findings to serum levels of bilirubin. A literature review was conducted during October 2017, using the terms "hyperbilirubinemia", "jaundice", "infant", "newborn" and "hearing loss", on databases CAPES journals, MEDLINE and BIREME (SciELO, BBO). 827 studies were identified and 59 were selected for full-text reading, resulting in the selection of seven articles that met the inclusion criteria and were considered relevant to the sample of this study. All the reviewed studies performed brainstem auditory evoked potential as the main test for audiological evaluation. Changes in the audiological findings of neonates with hyperbilirubinemia were observed in all studies. There was no consensus on the serum bilirubin levels that may cause auditory changes; however, the relationship between hearing disorders and blood levels of bilirubin was positive. We identify the need to establish reference values for bilirubin levels considered critical for the occurrence of hearing disorders as well as the audiological follow-up of neonates with hyperbilirubinemia.

RESUMO O aumento nos níveis de bilirrubina no neonato pode provocar efeitos tóxicos no sistema auditivo, podendo levar à perda auditiva. O objetivo desta revisão foi verificar o impacto da hiperbilirrubinemia na audição de recém-nascidos, relacionando os achados audiológicos aos níveis séricos de bilirrubina. Realizou-se uma revisão sistemática de literatura durante o mês de outubro de 2017, utilizando-se os termos hyperbilirubinemia, jaundice, infant, newborn e hearing loss, nas bases de dados periódicos Capes, Medline e Bireme (SciELO, BBO). Foram identificados 827 estudos, dentre os quais 59 foram selecionados para leitura do texto na íntegra, resultando na seleção de sete artigos que atendiam aos critérios de inclusão e foram considerados relevantes para a amostra deste trabalho. Em todas as pesquisas revisadas, o potencial evocado auditivo de tronco encefálico foi o principal exame audiológico realizado. Em todos os estudos foram observadas alterações nos resultados audiológicos de neonatos com hiperbilirrubinemia. Não houve consenso quanto aos níveis séricos de bilirrubina que podem causar alterações auditivas, porém, a relação entre as alterações audiológicas e os níveis sanguíneos de bilirrubina foi positiva. Percebeu-se a necessidade de estabelecer valores de referência para os níveis de bilirrubina considerados críticos para a ocorrência de alterações audiológicas, assim como de acompanhamento audiológico dos neonatos com hiperbilirrubinemia.

Mismatch Negativity in Children: Reference Values

Abstract Introduction The Mismatch Negativity (MMN) auditory evoked potential evaluation is a promising procedure to assess objectively the ability of auditory discrimination. Objective To characterize the latency and amplitude values of MMN in children with normal auditory thresholds and without auditory complaints. Methods Children between 5 and 11 years old participated in the present study. All participants underwent acoustic immittance measurements and tonal and vocal audiometry. The MMN was recorded with the MASBE ATC Plus system (Contronic, Pelotas, RS, Brazil). The electrodes were fixed in Fz (active electrode), Fpz (ground electrode) and in M2 and M1 (references electrodes). The intensity used was 80 dBHL, the frequent stimulus was 1,000 Hz and the rare stimulus was 2,000 Hz. The stimuli were presented in both ears separately. Results For the female group, the mean latencies and amplitude of MMN were 177.3 ms and 5.01 μV in the right ear (RE) and 182.4ms and 5.39 μV in the left ear (LE). In the male group, themean latencies were 194.4 ms in the RE and 183.6ms in the LE, with an amplitude of 5.11 μV in the RE and 5.83 μV in the LE. There was no statistically significant difference between ears (p = 0.867 - latency and p = 0.178 - amplitude), age (p > 0.20) and the gender of the participants (p > 0.05). Conclusion Using the described protocol, the mean latency value of MMN was 184.0 ms for RE and 182.9 ms for LE, and the amplitude was 5.05 μV and 5.56 μV for the left and right ears, respective.