Navegando por Palavras-chave "auditory evoked potentials"
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- ItemAcesso aberto (Open Access)Auditory evoked potentials and multiple sclerosis(Assoc Arquivos Neuro- Psiquiatria, 2010-08-01) Matas, Carla Gentile; Andrade Matas, Sandro Luiz de [UNIFESP]; Salzano de Oliveira, Caroline Rondina; Goncalves, Isabela Crivellaro; Universidade de São Paulo (USP); Universidade Federal de São Paulo (UNIFESP)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.
- ItemAcesso aberto (Open Access)Avaliação dos potenciais evocados auditivos do tronco encefálico na esclerose múltipla(Academia Brasileira de Neurologia - ABNEURO, 2003-06-01) Santos, Marco Aurélio Rocha [UNIFESP]; Peixoto, Marco Aurélio Lana; Munhoz, Mário Sérgio Lei [UNIFESP]; Almeida, Alessandra Varella De [UNIFESP]; Universidade Federal de Minas Gerais Departamento de Neurologia; Universidade Federal de São Paulo (UNIFESP); Universidade Federal de Minas Gerais Departamento de OftalmologiaThe aim of this study was to evaluate the incidence of auditory and neurotological disorders in multiple sclerosis (MS). Twenty female and 9 male with a definite diagnosis of multiple sclerosis without signs of involvement of the brain stem underwent an audiological and an early auditory evoked potentials (EAEP). The wave forms were classified according to Jerger's (1986) classification. In 58 EAEP it was found 55% of type I (normal response) according to Jerger's classification in both sexes. Considering as an abnormal response the EAEP classified in type II, III, IV or V according to Jerger in at least one side, it was found 60% of abnormalities in females and 56% in males, totalizing 58,62% of all the studied subjects. The authors emphasize the use of EAEP in MS.
- ItemAcesso aberto (Open Access)Estudo das latências e amplitudes dos potenciais evocados auditivos de média latência em indivíduos audiologicamente normais(ABORL-CCF Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial, 2007-02-01) Neves, Ivone Ferreira; Gonçalves, Isabela Crivellaro; Leite, Renata Aparecida; Magliaro, Fernanda Cristina Leite; Matas, Carla Gentile [UNIFESP]; Universidade de São Paulo (USP); FMABC; Universidade Federal de São Paulo (UNIFESP)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.
- ItemAcesso aberto (Open Access)Potenciais evocados auditivos: estudo com indivíduos portadores de lúpus eritematoso sistêmico(ABORL-CCF Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial, 2008-06-01) Rezende, Maíra Dos Santos da Mata; Iorio, Maria Cecilia Martinelli [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Systemic lupus erythematosus (SLE) is a multifactorial chronic systemic inflammatory disease, of unknown origin, characterized by the presence of autoantibodies and polymorphic clinical manifestations. This disease may involve multiple organs and systems. The most common findings are articular, cutaneous, vascular, renal, neurological, cardiac, gastrointestinal, hematological, ocular, and auditory abnormalities. AIM: To investigate the central auditory function of subjects diagnosed with Systemic Lupus Erythematosus (SLE). MATERIAL AND METHOD: A time-series study was made of sixty subjects, aged between 21 and 46 years, which were divided into a control (n=30) and an experimental group (n=30). A clinical history, audiological evaluation (pure tone audiometry, speech audiometry and immitance testing) and short (ABR), middle (MLR) and long latency (LLAEP) potentials were carried out in all subjects. RESULTS: No statistically significant differences were observed between the groups in any of the evaluations. CONCLUSIONS: In this study there were no differences in short, middle and long latency auditory potentials between the control and experiment subject groups.