Navegando por Palavras-chave "Potenciais Evocados Auditivos do Tronco Encefálico"
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- ItemAcesso aberto (Open Access)Alterações auditivas e fenilcetonúria: uma revisão sistemática(CEFAC Saúde e Educação, 2010-02-01) Mancini, Patrícia Cotta [UNIFESP]; Starling, Ana Lúcia Pimenta; Alves, Cláudia Fernanda Tolentino; Martins, Thaís Maria da Mata; Iorio, Maria Cecilia Martinelli [UNIFESP]; Universidade Federal de Minas Gerais Curso de Graduação em Fonoaudiologia; Universidade Federal de Minas Gerais Faculdade de Medicina Departamento de Pediatria; Universidade Federal de São Paulo (UNIFESP)BACKGROUND: phenylketonuria is a genetic disorder that causes biochemical alterations, leading to a deficiency in the synthesis of proteins and neurotransmitters and thereby hindering the myelination process. Structural and functional changes in myelin can alter neural conductivity patterns and or reduce synaptic connection in individuals with phenylketonuria. Essentially, a dietary treatment should be implemented in the first weeks of life in order to avoid clinical and biochemical manifestations of the disease. When diet is continually maintained, children with phenylketonuria show normal development. However, deficits in executive functions, interhemispherical interaction, language and memory have been observed even in children with early treatment and appropriate diet. Some researches were carried out for investigating the relationship between phenylketonuria and alterations in the hearing function. PURPOSE: to systematically review articles dedicated to the research of relationship between hearing disorders and hyperphenylalaninaemias, highlighting the classic phenylketonuria. The bibliographical references were obtained through research in the databases: Lilacs, Medline, Cochrane Library and Scielo and through search in the reference list of the identified and selected articles. CONCLUSION: the relationship among hyperphenylalaninaemias, including phenylketonuria, and hearing alterations is still controversial in the literature. It is suggested that more investigations as for the hearing function are necessary on those individuals in order to elucidate this possible relationship.
- ItemSomente MetadadadosAudiometria fisiologica tonal utilizando respostas de estado estavel auditivas do tronco cerebral(Universidade Federal de São Paulo (UNIFESP), 2002) Lins, Otavio Gomes [UNIFESP]Objetivo: Descrever o desenvolvimento de uma tecnica de audiometria fisiologica tona utilizando as respostas de estado estavel auditivas do tronco cerebral. Metodos: Tons d diferentes frequencias e com diferentes intensidades foram modulados em amplitude entre 75 110 Hz e apresentados isoladamente e simultaneamente a adultos e neonatos normais e a adulto com perdas auditivas conhecidas. Respostas de estado estavel foram registradas e analisadas n dominio da frequencia. Os limiares fisiologicos obtidos foram comparados aos limiares comportamentais. Resultados: Em adultos normais os limiares fisiologicos foram 11 a 14 dB acima dos limiares comportamentais para estimulos por conducao aerea e 9 a 14 dB acima do limiares comportamentais para estimulos por conducao ossea. Em neonatos normais os limiares fisiologicos foram em media 26 e 45 dB SPL, sendo maiores para os estimulos de 500 Hz. E adolescentes com perdas auditivas os limiares fisiologicos predisseram os limiares) comportamentais com coeficientes de correlacao entre 0.70 e 0.91. Conclusao: As respostas evocadas de estado estavel auditivas do tronco cerebral sao promissoras para a realizacao de audiometrias fisiologicas tonais. A tecnica de estimulacao multipla simultanea permite a obtencao dos limiares de 4 frequencias por ouvido simultaneamente
- ItemAcesso aberto (Open Access)Estudo do efeito de supressão no potencial evocado auditivo de tronco encefálico(Pró-Fono Produtos Especializados para Fonoaudiologia Ltda., 2010-09-01) Matas, Carla Gentile [UNIFESP]; Silva, Fernanda Nivoloni O; Leite, Renata Aparecida; Samelli, Alessandra Giannella; Universidade Federal de São Paulo (UNIFESP); Universidade de São Paulo (USP)BACKGROUND: the suppression effect with contralateral white noise observed in the brainstem auditory evoked potential can be influenced by the efferent auditory system. AIM: to evaluate the suppression effect with contralateral white noise in the Brainstem Auditory Evoked Potential of individuals with normal hearing. METHODS: 25 individuals, ranging in age from 18 to 30 years, of both genders, were submitted to a clinical history questionnaire, inspection of the external auditory canal, conventional audiometry, speech audiometry and acoustic immittance measurements. Only individuals with normal hearing thresholds were selected. The selected individuals underwent brainstem auditory evoked potential testing with and without contralateral white noise. RESULTS: a significant statistical difference was observed between the situations with and without contralateral white noise, for wave I amplitude and waves III and V latencies. No statistical differences were observed for the interpeak latencies. CONCLUSION: the present study indicated increased latencies and reduced amplitudes of waves I, III and V with contralateral noise, when comparing the situations with and without noise. These results suggest a possible influence of the efferent auditory system on the response modulation of Brainstem auditory evoked potential when contralateral white noise is used.
- ItemAcesso aberto (Open Access)Longitudinal electrophysiological study of auditory pathway in small for gestational age infants(Sociedade Brasileira de Fonoaudiologia, 2014-07-01) Angrisani, Rosanna Giaffredo; Diniz, Edna Maria Albuquerque; Guinsburg, Ruth [UNIFESP]; Ferraro, Alexandre Archanjo; Azevedo, Marisa Frasson de [UNIFESP]; Matas, Carla Gentile; Universidade de São Paulo (USP); Universidade Federal de São Paulo (UNIFESP)PURPOSE:To follow the maturation of the auditory pathway of infants born small for gestational age term, by studying absolute and interpeak latencies of Auditory Brainstem Response (ABR) in the first six months of life.METHODS:Multicentric prospective longitudinal study. The ABR was carried out in the neonatal period in 96 newborn infants, 49 small for gestational age (SGA) and 47 appropriate for gestational age (AGA). Of these, 77 infants (39 SGA and 38 AGA) returned for a second evaluation. In the third evaluation, 70 infants (35 SGA and 35 AGA) returned.RESULTS:SGA and AGA did not present significant differences in the neonatal period and at three months of life. However, at six months, there was statistical significant difference between SGA and AGA groups for the latencies of wave III and interpeak I-III. Latencies of ABR waves decreased more rapidly in the first three months than the third to the sixth month of life for the SGA. AGA group showed progressive decrease in latency of ABR waves during the six months.CONCLUSION:The findings suggest that, for SGA infants, the maturational process of the auditory pathway occurs in different rate when compared to AGA infants. The SGA infants have faster maturation especially at the first three months of life, while in infants AGA, this process occurred in a constant and gradual way throughout the six months studied.
- ItemAcesso aberto (Open Access)Padronização do potencial evocado auditivo de tronco encefálico utilizando um novo equipamento(Pró-Fono Produtos Especializados para Fonoaudiologia Ltda., 2010-12-01) Soares, Ilka do Amaral [UNIFESP]; Menezes, Pedro de Lemos [UNIFESP]; Carnaúba, Aline Tenório Lins; Pereira, Liliane Desgualdo [UNIFESP]; Universidade Estadual de Ciências da Saúde; Universidade Federal de São Paulo (UNIFESP)BACKGROUND: standardization of Brainstem Auditory Evoked Potential (BAEP) using a new device. AIM: to standardize BAEP responses using a new device developed (NDD) in Brazil. METHOD: analysis of absolute latencies, interpeaks and wave amplitudes of BAEP, using a new device developed to study normal-hearing groups (91 adults) and individuals (15 adults) with bilateral neurosensory hearing loss. Responses obtained in the EP15 hearing device/Interacoustics and the NDD were compared. For this, the following paramenters were used: non-filtered click of 100 microsecond (µs), totaling 2000 stimuli in rarefied polarity, stimulation frequency of 13.1 clicks/s, intensity of 80 decibels normalized hearing level (dB nHL), with a window of 10 milliseconds and bandpass filter between 100 and 3000 Hertz (Hz). Significance level was set at 0.05. RESULTS: absolute latency and interpeak means for 76 normal-hearing individuals with the NDD were: wave I=1.50, III=3.57, V=5.53, I-III=2.06, III-V=1.96 and I-V=4.02. When analyzing results according to gender, there was a statistically significant difference for the absolute latencies of waves III and V and in interpeaks I-III and I-V. Mean amplitude value of wave I=0.384 microvolt (µV) and of wave V=0.825 µV. There was no statistically significant difference between the absolute latencies and interpeaks of the two devices in the same individual. CONCLUSION: the components of BAEP with the NDD in normal-hearing subjects were similar regarding the tested ears, with statistically lower latencies in women. The BAEP latencies in the same individual with NDD were similar to those obtained with the EP15 / Interacoustics. Normal values of BAEP were obtained in normal-hearing adults.
- ItemSomente MetadadadosRespostas elétricas de tronco encefálico por estimulação aérea e óssea em neonatos(Universidade Federal de São Paulo (UNIFESP), 2002) Chapchap, Monica Jubran [UNIFESP]; Azevedo, Marisa Frasson de [UNIFESP]As Respostas Eletricas de Tronco Encefalico, atraves do Potencial Auditivo Evocado de Tronco Encefalico por via aerea, tem sido amplamente aplicadas na deteccao e diagnostico das alteracoes auditivas em neonatos. O uso do Potencial Auditivo Evocado de Tronco Encefalico por via ossea pode contribuir para a deteccao e diagnostico da defiCiência auditiva no periodo neonatal. 0 presente estudo verificou e comparou as respostas eletricas por via aerea e via ossea em 30 neonatos a termo, sendo 15 do sexo feminino e 15 do sexo masculino. Quando utilizado o Potencial Auditivo Evocado de Tronco Encefalico por via aerea, os neonatos do sexo feminino apresentaram latencias absolutas III e V e latencia interpico I-III menores que as latencias dos neonatos do sexo masculino. A orelha esquerda apresentou latencias menores que a orelha direita apenas nos neonatos do sexo feminino. A analise dos resultados obtida pelo Potencial Auditivo Evocado de Tronco Encefalico por via aerea demonstrou a importancia do estabelecimento de valores de referencia diferentes para as variaveis sexo e orelha. Quando utilizado o Potencial Auditivo Evocado de Tronco Encefalico por via ossea, nao houve diferenca significante para as latencias absolutas e latencias interpico para as variaveis sexo e orelha. Na analise comparativa das latencias entre os dois metodos, observou-se que nao houve diferenca significante para os neonatos do sexo masculino. Os neonatos do sexo feminino apresentaram latencias menores pela captacao por via aerea que por via ossea. Concluiu-se que as duas metodologias sao viaveis e complementares na avaliacao auditiva de neonatos