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1.
Clinics ; 69(3): 212-218, 3/2014. tab
Article in English | LILACS | ID: lil-703603

ABSTRACT

OBJECTIVES: This study investigated whether neurophysiologic responses (auditory evoked potentials) differ between typically developed children and children with phonological disorders and whether these responses are modified in children with phonological disorders after speech therapy. METHODS: The participants included 24 typically developing children (Control Group, mean age: eight years and ten months) and 23 children clinically diagnosed with phonological disorders (Study Group, mean age: eight years and eleven months). Additionally, 12 study group children were enrolled in speech therapy (Study Group 1), and 11 were not enrolled in speech therapy (Study Group 2). The subjects were submitted to the following procedures: conventional audiological, auditory brainstem response, auditory middle-latency response, and P300 assessments. All participants presented with normal hearing thresholds. The study group 1 subjects were reassessed after 12 speech therapy sessions, and the study group 2 subjects were reassessed 3 months after the initial assessment. Electrophysiological results were compared between the groups. RESULTS: Latency differences were observed between the groups (the control and study groups) regarding the auditory brainstem response and the P300 tests. Additionally, the P300 responses improved in the study group 1 children after speech therapy. CONCLUSION: The findings suggest that children with phonological disorders have impaired auditory brainstem and cortical region pathways that may benefit from speech therapy. .


Subject(s)
Child , Female , Humans , Male , Articulation Disorders/physiopathology , Articulation Disorders/therapy , /physiology , Evoked Potentials, Auditory, Brain Stem/physiology , Speech Therapy/methods , Analysis of Variance , Auditory Pathways/physiopathology , Case-Control Studies , Language Tests , Language Development Disorders/physiopathology , Language Development Disorders/therapy , Predictive Value of Tests , Prospective Studies , Reference Values , Treatment Outcome
2.
São Paulo; s.n; 2013. [194] p. ilus, tab, graf.
Thesis in Portuguese | LILACS | ID: lil-730854

ABSTRACT

Introdução: A gagueira é um distúrbio da fluência multidimensional que resulta da interação de múltiplos processos fisiológicos, refletindo mais de um fator causal. Evidências científicas atuais sustentam a hipótese de que pessoas que gaguejam possuem conexões anômalas em regiões auditivas do hemisfério esquerdo, envolvidas no feedback sensorial dos sons da fala. Desta forma, é prudente pensar que déficits na sincronia neural, identificados por meio de alterações em testes comportamentais do processamento temporal e nos potenciais evocados auditivos (PEA), possam estar relacionados a este tipo de distúrbio. Objetivo: caracterizar os resultados do teste Gaps in Noise (GIN) e dos PEA com estímulos de diferentes complexidades em crianças gagas e em crianças em desenvolvimento típico. Métodos: Dez crianças gagas com idades entre sete e 11 anos (grupo estudo - GE) e seus pares nãogagos (grupo controle - GC) foram submetidos a avaliações audiológicas e eletrofisiológicas da audição por meio dos seguintes testes: medidas de imitância acústica, audiometria tonal, logoaudiometria, teste GIN, potencial evocado auditivo de tronco encefálico (PEATE) com estímulos clique e de fala e potencial evocado auditivo de longa latência (PEALL) com estímulo tone burst e de fala. Os resultados obtidos no GC e GE foram comparados por meio de testes estatísticos. Resultados: Ambos os grupos apresentaram resultados normais no teste GIN, de acordo com os critérios de normalidade adotados, contudo, observou-se melhor desempenho no GE. Não foram encontradas diferenças significantes entre os grupos para os resultados do teste GIN. No PEATE com estímulo clique, todos os sujeitos avaliados apresentaram resultados dentro dos padrões de normalidade. Observou-se no GE maior variabilidade nos tempos de latência, bem como tendência à diferença estatisticamente significante entre as orelhas direita e esquerda para o interpico I-III. No PEATE com estímulo de fala, verificaram-se valores de...


Introduction: Stuttering is a multidimensional speech disorder that results from the interaction of multiple physiological processes, which means there is more than one causal factor. Current scientific evidence supports the hypothesis that people who stutter have anomalous connections in auditory regions of the left hemisphere, involved in the sensory feedback of speech sounds. Thus, it is reasonable to suppose that deficits in neural synchrony, showed by abnormal results in behavioral tests of temporal processing and auditory evoked potentials (AEP), may be related to this type of disorder. Objective: to characterize the results of the Gaps in Noise Test (GIN) and the AEP using stimuli of different complexity, in children who stutter and in typically developing children. Methods: Ten children who stutter aged between seven and 11 years (study group - SG) and their non-stuttering peers (control group - CG) underwent audiological and electrophysiological evaluation using the following tests: acoustic immittance measures, tonal audiometry, speech audiometry, GIN test, speech- and click-evoked Auditory Brainstem Response (ABR), and Long Latency Response (LLR) with tone burst and speech stimuli. Statistical tests were carried out for comparisons between CG and SG. Results: Both groups presented normal results in the GIN test, according to the normality criteria. However, the SG showed better performance. No significant differences were found between groups for the GIN test results. In the click-evoked ABR, all subjects presented results within the normal range. The SG showed greater variability concerning the latency values, as well as a statistical trend toward significance regarding differences between the right and left ears for the interpeak I-III. In speech-evoked ABR, the latency values of wave C and the amplitude of VA complex were significantly higher in SG. No statistically significant difference between groups was observed in LLR...


Subject(s)
Humans , Male , Female , Child , Auditory Perception , Child , Evoked Potentials, Auditory , Evoked Potentials, Auditory, Brain Stem , Hearing Tests , Stuttering
3.
Rev. Soc. Bras. Fonoaudiol ; 16(1): 37-41, 2011. tab
Article in Portuguese | LILACS | ID: lil-580411

ABSTRACT

OBJETIVO: Avaliar a estabilidade dos parâmetros dos potenciais evocados auditivos em adultos normais. MÉTODOS: Foram submetidos à avaliação audiológica e eletrofisiológica (potencial evocado auditivo de tronco encefálico - PEATE, potencial evocado auditivo de média latência - PEAML e potencial cognitivo - P300) 49 indivíduos normais, de 18 a 40 anos (25 do gênero feminino e 24 do gênero masculino). Realizou-se reavaliação três meses após a avaliação. RESULTADOS: Foram observadas diferenças entre os gêneros na avaliação para as latências das ondas III e V e interpicos I-III e I-V do PEATE e amplitude N2-P3 do P300. Não foram verificadas diferenças significativas para os parâmetros do PEATE, PEAML (latência das ondas Na, Pa e amplitude Na - Pa) e P300 (latência da onda P300) entre os resultados obtidos na avaliação e reavaliação. CONCLUSÃO: Exceção feita à amplitude N2-P3, observou-se estabilidade dos parâmetros de PEATE, PEAML e P300 em adultos normais após período de três meses.


PURPOSE: To evaluate the stability of parameters of auditory evoked potentials in normal adults. METHODS: Forty-nine normal subjects with ages from 18 to 40 years (25 females and 24 males) were submitted to audiological and electrophysiological hearing evaluation (auditory brainstem response - ABR, middle latency response - MLR, and cognitive potential - P300). Subjects were reassessed three months after the initial evaluation. RESULTS: Significant differences were observed between genders regarding the wave latencies III and V and the interpeaks I-III and I-IV of ABR, and the amplitude N2-P3 of the P300. No differences were found between the results of initial and final assessments for the parameters of the ABR, MLR (Na, Pa latencies and Na-Pa amplitude) and P300 (P300 latency). CONCLUSION: Except for the N2-P3 amplitude, it was observed stability of the parameters of ABR, MLR and P300 in normal adults after a period of three months.


Subject(s)
Humans , Adult , Evoked Potentials, Auditory , Hearing , Hearing Tests
4.
Clinics ; 66(2): 293-298, 2011. tab
Article in English | LILACS | ID: lil-581517

ABSTRACT

OBJECTIVE: To determine whether neurophysiological auditory brainstem responses to clicks and repeated speech stimuli differ between typically developing children and children with phonological disorders. INTRODUCTION: Phonological disorders are language impairments resulting from inadequate use of adult phonological language rules and are among the most common speech and language disorders in children (prevalence: 8 - 9 percent). Our hypothesis is that children with phonological disorders have basic differences in the way that their brains encode acoustic signals at brainstem level when compared to normal counterparts. METHODS: We recorded click and speech evoked auditory brainstem responses in 18 typically developing children (control group) and in 18 children who were clinically diagnosed with phonological disorders (research group). The age range of the children was from 7-11 years. RESULTS: The research group exhibited significantly longer latency responses to click stimuli (waves I, III and V) and speech stimuli (waves V and A) when compared to the control group. DISCUSSION: These results suggest that the abnormal encoding of speech sounds may be a biological marker of phonological disorders. However, these results cannot define the biological origins of phonological problems. We also observed that speech-evoked auditory brainstem responses had a higher specificity/sensitivity for identifying phonological disorders than click-evoked auditory brainstem responses. CONCLUSIONS: Early stages of the auditory pathway processing of an acoustic stimulus are not similar in typically developing children and those with phonological disorders. These findings suggest that there are brainstem auditory pathway abnormalities in children with phonological disorders.


Subject(s)
Child , Female , Humans , Male , Acoustic Stimulation/methods , Auditory Pathways/physiology , Evoked Potentials, Auditory, Brain Stem/physiology , Speech Disorders/physiopathology , Analysis of Variance , Case-Control Studies , Electroencephalography , Prospective Studies
5.
Pró-fono ; 22(3): 269-274, jul.-set. 2010. tab
Article in Portuguese | LILACS | ID: lil-564975

ABSTRACT

TEMA: a literatura relata a ocorrência de alteração auditiva em pacientes com HIV/AIDS, podendo esta ser decorrente de comprometimentos na orelha externa, média e/ou interna. OBJETIVOS: caracterizar e comparar os resultados da avaliação audiológica e do Potencial Evocado Auditivo de Tronco Encefálico de crianças e adultos com AIDS. MÉTODOS: foram submetidos à avaliação audiológica e eletrofisiológica (Potencial Evocado Auditivo de Tronco Encefálico) 51 crianças e 22 adultos com AIDS (grupos pesquisa I e II respectivamente) e 50 crianças e 25 adultos saudáveis (grupos controle I e II respectivamente), com idade entre três e 10 anos (crianças) e entre 18 e 50 anos (adultos). RESULTADOS: nas crianças com AIDS foram mais frequentes as alterações de orelha média e nos adultos as de orelha interna, bem como maior ocorrência de resultados alterados no potencial evocado auditivo de tronco encefálico nos adultos quando comparados às crianças. CONCLUSÃO: crianças e adultos com AIDS apresentam alterações na avaliação audiológica e no potencial evocado auditivo de tronco encefálico, sugestivas de comprometimento das vias auditiva periférica e central. Os resultados enfatizam a eficácia da utilização dos testes eletrofisiológicos da audição para melhor definição do grau de lesão encefálica em pacientes com AIDS, permitindo ainda a monitorização da velocidade de evolução da doença.


BACKGROUND: according to the literature, the incidence of hearing impairment in patients with HIV / AIDS might be caused by alterations in external, middle and / or internal ear. AIM: to characterize and to compare the results of audiological assessment and Auditory Brainstem Response in children and adults with AIDS. METHOD: audiological and electrophysiological (Auditory Brainstem Response) assessment of hearing was carried out in 51 children and 22 adults with HIV/AIDS (research groups I and II, respectively) and in 50 healthy children and 25 healthy adults (control groups I and II, respectively). Participants ranged in age between 3 and 10 years (children) and between 18 and 50 years (adults). RESULTS: the most frequent observed alteration for children with AIDS was related to the middle ear whereas for adults with AIDS it was related to the internal ear. Higher occurrence of abnormal results was observed for adults with AIDS as compared to children with AIDS. CONCLUSION: children and adults with AIDS present alterations in audiological assessment and Auditory Brainstem Response. This suggests the involvement of peripheral and central auditory pathways. Findings of the present study emphasize the effectiveness of using electrophysiological hearing measures in order to better identify the brain injury level in patients with AIDS, besides allowing the monitoring of the development rate of the disease.


Subject(s)
Adolescent , Adult , Child , Child, Preschool , Female , Humans , Male , Middle Aged , Young Adult , Acquired Immunodeficiency Syndrome/complications , Ear, Inner/physiology , Ear, Middle/physiology , Evoked Potentials, Auditory, Brain Stem/physiology , Hearing Loss, Conductive/diagnosis , Case-Control Studies , Electrophysiology , Hearing Loss, Conductive/etiology
6.
Arq. neuropsiquiatr ; 68(4): 528-534, Aug. 2010. tab
Article in English | LILACS | ID: lil-555229

ABSTRACT

Multiple sclerosis (MS) is an inflammatory, demyelinating disease that can affect several areas of the central nervous system. Damage along the auditory pathway can alter its integrity significantly. Therefore, it is important to investigate the auditory pathway, from the brainstem to the cortex, in individuals with MS. OBJECTIVE: The aim of this study was to characterize auditory evoked potentials in adults with MS of the remittent-recurrent type. METHOD: The study comprised 25 individuals with MS, between 25 and 55 years, and 25 age- and gender-matched healthy controls (research and control groups). Subjects underwent audiological and electrophysiological evaluations. RESULTS: Statistically significant differences were observed between the groups regarding the results of the auditory brainstem response and the latency of the Na and P300 waves. CONCLUSION: Individuals with MS present abnormalities in auditory evoked potentials indicating dysfunction of different regions of the central auditory nervous system.


A esclerose múltipla é uma doença inflamatória desmielinizante que pode se desenvolver em diversas regiões do sistema nervoso central. O comprometimento da via auditiva central pode alterar significativamente a integridade desta e, portanto, a investigação desta região em indivíduos com esclerose múltipla, desde o tronco encefálico até o córtex, torna-se importante. OBJETIVO: Caracterizar os resultados dos potenciais evocados auditivos em adultos com esclerose múltipla do tipo remitente-recorrente. MÉTODO: Foram submetidos às avaliações audiológica e eletrofisiológica 25 indivíduos pertencentes ao grupo controle e 25 ao grupo pesquisa, com idades entre 25 e 55 anos. RESULTADOS: Verificou-se diferença estatisticamente significante entre os grupos quanto à ocorrência de resultados normais e alterados no potencial evocado auditivo de tronco encefálico e latências das ondas Na e P300. CONCLUSÃO: Indivíduos com esclerose múltipla apresentam alterações nos potenciais evocados auditivos, indicando comprometimento de diferentes regiões do sistema nervoso auditivo central.


Subject(s)
Adult , Female , Humans , Male , Middle Aged , Young Adult , Auditory Pathways/physiopathology , /physiology , Evoked Potentials, Auditory/physiology , Multiple Sclerosis, Relapsing-Remitting/physiopathology , Case-Control Studies , Hearing Tests , Reaction Time , Young Adult
7.
Pró-fono ; 22(2): 107-113, abr.-jun. 2010. tab
Article in English, Portuguese | LILACS | ID: lil-554276

ABSTRACT

BACKGROUND: auditory evoked potentials (AEP) assess the neuroelectric activity on the auditory pathway -from the auditory nerve to the cerebral cortex - in response to an acoustic stimulus or event. Studies have demonstrated electrophysiological abnormalities in individuals with HIV/AIDS. AIM: to characterize the hearing electrophysiological manifestations in adults with HIV/AIDS by comparing the results obtained in the group exposed to antiretroviral therapy with those obtained in the group not exposed to such treatment. METHOD: electrophysiological evaluation of hearing (Auditory Brainstem Response - ABR, Auditory Middle Latency Reponse - AMLR and P300) was conducted in 56 individuals with HIV/AIDS: 24 participants composed group I (not exposed to antiretroviral treatment) and 32 participants composed group II (exposed to treatment). RESULTS: alterations in every AEP were observed in individuals with HIV/ AIDS, especially in the ABR. Indeed, the group exposed to antiretroviral treatment presented more alterations. CONCLUSION: individuals with HIV/AIDS may present alterations on the central and peripheral auditory nervous system. The group exposed to antiretroviral therapy presents more alterations on the brainstem auditory pathway.


TEMA: os potenciais evocados auditivos (PEA) avaliam a atividade neuroelétrica na via auditiva, desde o nervo auditivo até o córtex cerebral, em resposta a um estímulo ou evento acústico. Estudos demonstram anormalidades eletrofisiológicas em indivíduos com HIV/AIDS. OBJETIVO: caracterizar as manifestações eletrofisiológicas da audição em adultos com HIV/AIDS, comparando os resultados obtidos no grupo exposto a tratamento anti-retroviral com os obtidos no grupo não exposto a tratamento. MÉTODO: realizada avaliação eletrofisiológica da audição (PEATE, PEAML e P300) em 56 indivíduos portadores do HIV/AIDS, sendo 24 do Grupo I (não expostos ao tratamento anti-retroviral) e 32 do Grupo II (expostos ao tratamento). RESULTADOS: foram encontradas alterações em todos os PEA nos indivíduos com HIV/AIDS, principalmente no PEATE; sendo que neste, o grupo exposto ao tratamento antiretroviral apresentou mais alterações. CONCLUSÃO: indivíduos com HIV/AIDS podem apresentar alterações no sistema nervoso auditivo periférico e central, sendo que o grupo exposto a tratamento anti-retroviral apresenta mais alterações na via auditiva em tronco encefálico.


Subject(s)
Adolescent , Adult , Humans , Middle Aged , Young Adult , Antiretroviral Therapy, Highly Active , /physiology , Evoked Potentials, Auditory/physiology , HIV Infections/physiopathology , Hearing Loss/diagnosis , Acoustic Stimulation , Audiometry, Pure-Tone , Acquired Immunodeficiency Syndrome/complications , Acquired Immunodeficiency Syndrome/drug therapy , Antiretroviral Therapy, Highly Active/adverse effects , Auditory Diseases, Central/diagnosis , Auditory Diseases, Central/etiology , Case-Control Studies , /drug effects , Evoked Potentials, Auditory/drug effects , HIV Infections/drug therapy , Hearing Loss/etiology , Young Adult
8.
Rev. Soc. Bras. Fonoaudiol ; 15(2): 174-178, 2010. tab
Article in Portuguese | LILACS | ID: lil-553424

ABSTRACT

OBJETIVO: Caracterizar as manifestações audiológicas em adultos com HIV/AIDS e comparar os resultados de indivíduos expostos e não expostos ao tratamento anti-retroviral. MÉTODOS: Foram submetidos à avaliação audiológica 56 indivíduos com HIV/AIDS de ambos os gêneros, entre 18 e 58 anos de idade, divididos em dois grupos: GEI - composto por 24 indivíduos não expostos ao tratamento anti-retroviral; e GEII - composto por 32 indivíduos expostos ao tratamento anti-retroviral. RESULTADOS: Verificou-se ocorrência de resultados alterados na avaliação audiológica em ambos os grupos, principalmente na audiometria de altas frequências. Em ambos os grupos a principal alteração encontrada foi a perda auditiva neurossensorial. O GEII apresentou mais resultados alterados em todos os procedimentos realizados e maior ocorrência de resultados sugestivos de alterações na orelha média, quando comparado ao GEI. CONCLUSÃO: Indivíduos com HIV/AIDS apresentam alterações auditivas periféricas, sendo estas mais acentuadas no grupo exposto ao tratamento anti-retroviral.


PURPOSE: To characterize audiological manifestations in adults with HIV/AIDS and to compare the results of subjects exposed and not exposed to antiretroviral treatment. METHODS: Fifty six individuals with HIV/AIDS of both genders, with ages between 18 and 58 years, were submitted to audiological evaluation. Subjects were divided into two groups: GEI - composed of 24 individuals not exposed to antiretroviral treatment; and GEII - composed of 32 individuals exposed to antiretroviral treatment. RESULTS: It was verified occurrence of altered results on audiological evaluation in both groups, mainly in the high frequencies audiometry. In both groups, the main alteration found was sensorineural hearing loss. The GEII showed more altered results in all procedures performed, and higher occurrence of findings suggestive of alterations in middle ear, when compared to GEI. CONCLUSION: Individuals with HIV/AIDS in this study had peripheral hearing impairment, more pronounced in the group exposed to antiretroviral treatment.


Subject(s)
Humans , Adult , Middle Aged , Antiretroviral Therapy, Highly Active , Audiometry , Hearing Loss , HIV , Acquired Immunodeficiency Syndrome/complications
9.
Appl. cancer res ; 29(2): 95-99, Apr.-June 2009. ilus, tab
Article in English | LILACS, Inca | ID: lil-547672

ABSTRACT

Hearing is a channel of extreme importance for life because it enables the development of oral language; acquiring the knowledge to communicate with the world. Hearing loss can occur due to innumerous factors and can be expressed in various forms, according to its type and degree, and any impediment in the transport of sound to the central auditory nervous system implies a loss of part or all of the message content. Cisplatin chemotherapy treatment has ototoxicity as one of its described side effects. For that reason, the monitoring of the hearing of individuals submitted to cisplatin chemotherapy treatment has been a growing concern, especially in children presenting retinoblastoma. This study had as objective to describe the consequences of a hearing loss due to ototoxicity in the speech intelligibility of a child diagnosed as having retinoblastoma diagnosed at 22 months of age. Audiological monitoring showed a progressive hearing loss as well as deterioration of speech intelligibility. We have verified that the use of accumulative doses of cisplatin can compromise neural components of the auditory system resulting in a deterioration of speech intelligibility. The early detection of hearing loss in these cases is fundamental to avoid deafness progression as well as to conduct an adequate orientation for the school and family of the patient.


Subject(s)
Female , Child , Auditory Pathways , Central Nervous System , Cisplatin , Hearing Loss , Speech Intelligibility
10.
Rev. bras. otorrinolaringol ; 75(1): 130-138, jan.-fev. 2009. tab
Article in English, Portuguese | LILACS | ID: lil-514845

ABSTRACT

Indivíduos com transtornos psiquiátricos podem apresentar distúrbios perceptuais, de atenção e memória, questionando-se a presença de perdas auditivas periféricas e/ou centrais. Assim, o objetivo deste trabalho é descrever os resultados obtidos nas avaliações audiológica e eletrofisiológica, verificando a ocorrência de alterações auditivas periféricas e/ou centrais nesta população. Casuística e Métodos: Foram avaliados 20 indivíduos com autismo e síndrome de Asperger, e 20 indivíduos em desenvolvimento típico, entre oito e 19 anos. Resultados: Todos os indivíduos apresentaram resultados normais na avaliação audiológica. No PEATE, 50% dos indivíduos com autismo e 30% com síndrome de Asperger apresentaram alterações, havendo diferença estatisticamente significante na análise dos dados quantitativos em ambos os grupos. Em todos os grupos verificaram-se alterações no PEAML e P300. No PEAML, não houve diferençaestatisticamente significante entre os grupos na análise dos dados quantitativos e qualitativos. No P300, observou-se diferença estatisticamente significante quando comparados os grupos controle e síndrome de Asperger na análise dos dados quantitativos. Conclusão: Verificou-se grande ocorrência de alterações nos potenciais evocados auditivos em crianças autistas e com síndrome de Asperger, embora em algumas análises realizadas não tenha sido constatada diferença estatisticamente significante. Enfatiza-se a importância da investigação minuciosa da função auditiva em indivíduos com transtornos psiquiátricos.


Individuals with psychiatric disorders can present perception, attention and memory deficits, raising doubts about peripheral and/or central hearing loss. Thus, the aim of this study is to describe the audiological and electrophysiological results of individuals with psychiatric disorders, looking for peripheral and/or central auditory disorders. Methods: 20 individuals with autism and Asperger syndrome and 20 individuals without psychiatric disorders from eight to 19 years of age, were submitted to audiological and electrophysiological evaluation. Results: No alterations were observed on the audiological evaluation in all the individuals. In ABR, 50% of individuals with autism and 30% with Asperger syndrome presented alterations. Significant statistical differences were observed between the groups in the quantitative analysis. All groups presented alterations in AMLR and P300. In AMLR, no significant statistical differences were observed between the groups in the qualitative and quantitative analyses. In the P300, we noticed significant statistical differences between Asperger and control groups in the quantitative analysis. Conclusions: A high occurrence of alterations in auditory evoked potentials was seen in children with psychiatric disorders, although in some analysis it was observed a non-statistically significant difference when comparing study and control groups. We stress the need for a more careful investigation of the auditory function in this population.


Subject(s)
Adolescent , Child , Female , Humans , Male , Young Adult , Asperger Syndrome/physiopathology , Auditory Perceptual Disorders/physiopathology , Autistic Disorder/physiopathology , /physiology , Evoked Potentials, Auditory, Brain Stem/physiology , Audiometry, Pure-Tone , Case-Control Studies , Reaction Time/physiology , Young Adult
11.
Rev. bras. otorrinolaringol ; 73(1): 75-80, jan.-fev. 2007. tab
Article in Portuguese | LILACS | ID: lil-449709

ABSTRACT

Estudo de coorte contemporânea com corte transversal. O Potencial Evocado Auditivo de Média Latência (PEAML) é gerado entre 10 e 80ms e possui múltiplos geradores, com maior contribuição da região tálamo-cortical. O estabelecimento de critérios de normalidade para os valores de latência e amplitude é necessário para uso clínico. OBJETIVOS: Analisar a latência e amplitude do PEAML em indivíduos sem alterações audiológicas, e verificar a confiabilidade da amplitude Pa-Nb. MATERIAL E MÉTODO: Foram coletados os PEAML de 25 indivíduos durante o ano de 2005 e analisados os componentes Na, Pa, Nb para cada orelha testada (A1 e A2), e posicionamento de eletrodo (C3 e C4). RESULTADOS: Observou-se diferença estatisticamente significante entre os valores médios de latência para C3A1 e C4A1 com relação aos componentes Na e Pa, não sendo encontrada esta diferença para o componente Nb e valores médios das amplitudes Na-Pa e Pa-Nb. CONCLUSÃO: Foram estabelecidos os valores das médias e desvios padrão para os parâmetros latência e amplitude dos componentes Na, Pa, Nb, e Na-Pa e Pa-Nb, nas condições C3A1, C4A1, C3A2, C4A2, proporcionando os parâmetros para a análise e interpretação deste potencial.


Contemporary cohort cross-sectional study. Introduction: The auditory middle latency response (AMLR) is generated between 10 and 80 ms and has multiple generators, with a greater contribution from the thalamus-cortical pathways. The establishment of normality criteria for latency and amplitude values is necessary for clinical use. AIM: to analyze the latency and amplitude of the AMLR in individuals without audiological disorders, and verify the reliability of Pa-Nb amplitude. MATERIALS AND METHODS: The AMLR of 25 individuals was collected during 2005 and the Na, Pa, Nb components were analyzed for each tested ear (A1 and A2), and electrode positioning (C3 and C4). RESULTS: A statistically significant difference was noticed among middle latency values for C3A1 and C4A1 regarding components Na and Pa, and no difference for component Nb and mean values for amplitudes Na-Pa and Pa-Nb. Conclusions: We established average and standard deviation values for latency and amplitude parameters for components Na, Pa, Nb and Na-Pa and Pa-Nb, under conditions C3A1, C4A1, C3A2, C4A2, providing a parameter for the analysis and interpretation of this potential.


Subject(s)
Humans , Male , Female , Adult , Evoked Potentials, Auditory/physiology , Reaction Time/physiology , Cohort Studies , Cross-Sectional Studies , Reference Standards , Reproducibility of Results
12.
Rev. Soc. Bras. Fonoaudiol ; 12(2): 79-85, 2007. tab
Article in Portuguese | LILACS | ID: lil-457750

ABSTRACT

OBJETIVO: Descrever os resultados obtidos nas avaliações audiológica e eletrofisiológica da audição, verificando a ocorrência de alterações auditivas periféricas e/ou centrais, de indivíduos com síndrome de Landau-Kleffner. MÉTODOS: Foram submetidos à avaliação audiológica (inspeção do meato acústico externo, medidas de imitância acústica, audiometrias tonal e vocal) e eletrofisiológica da audição (potenciais evocados auditivos de curta, média e longa latência), quatro indivíduos com diagnóstico de síndrome de Landau-Kleffner, na faixa etária de nove a 19 anos, encaminhados ao Laboratório de Investigação Fonoaudiológica em Potenciais Evocados Auditivos do Curso de Fonoaudiologia da Universidade de São Paulo. RESULTADOS: Os resultados mostraram que 100 por cento dos indivíduos apresentaram alteração em pelo menos uma das avaliações realizadas, sendo que houve uma maior ocorrência de alterações no potencial evocado auditivo de média latência (100 por cento dos indivíduos apresentaram alterações). CONCLUSÕES: Observou-se uma grande ocorrência de alterações nos resultados das avaliações audiológicas e eletrofisiológicas da audição em indivíduos com síndrome de Landau-Kleffner. Enfatiza-se a importância da investigação da função auditiva destes indivíduos a fim de verificar possíveis relações entre os déficits da comunicação e alterações auditivas que possam estar presentes nessa população.


PURPOSE: To describe the audiological and electrophysiological results of individuals with Landau-Kleffner syndrome, verifying the occurrence of peripheral and/or central auditory disorders. METHODS: Four individuals with Landau-Kleffner syndrome with ages ranging from nine to 19 years old, referred to the Auditory Evoked Potentials Laboratory of the Speech and Language Pathology and Audiology Course of the University of São Paulo, were submitted to audiologic (otoscopy, immitance measurements, pure tone and speech audiometry) and electrophysiological evaluation (short, middle and long-latency auditory evoked potentials). RESULTS: All individuals showed alterations in at least one of the evaluations performed, and it was observed a higher rate of alterations in the middle latency response (100 percent of the individuals showed alterations). CONCLUSIONS: A great occurrence of auditory disorders in audiological and electrophysiological evaluation of individuals with Landau-Kleffner syndrome was observed. It is emphasized the importance of the audiological investigation of these individuals, in order to verify possible relations between communication and auditory disorders in this population.


Subject(s)
Agnosia , Evoked Potentials, Auditory , Hearing Tests , Landau-Kleffner Syndrome , Language Disorders
13.
Braz. j. infect. dis ; 10(4): 264-268, Aug. 2006. tab
Article in English | LILACS | ID: lil-440680

ABSTRACT

We examined the peripheral auditory system and the auditory brainstem pathway of children with Acquired Immunodeficiency Syndrome (AIDS). One hundred and one children, 51 with AIDS diagnosis and 50 normal children were evaluated. Audiological assessment included immittance measures, pure tone and speech audiometry and auditory brainstem response (ABR). The children with AIDS more frequently had abnormal results than did their matched controls, presenting either peripheral or auditory brainstem impairment. We suggest that AIDS be considered a risk factor for peripheral and/or auditory brainstem disorders. Further research should be carried out to investigate the auditory effects of HIV infection along the auditory pathway.


Subject(s)
Child , Child, Preschool , Female , Humans , Male , Acquired Immunodeficiency Syndrome/complications , Auditory Perceptual Disorders/diagnosis , Evoked Potentials, Auditory, Brain Stem/physiology , Audiometry, Pure-Tone , Auditory Perceptual Disorders/etiology , Case-Control Studies , Electrophysiology , Risk Factors
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