Navegando por Palavras-chave "potenciais evocados auditivos"
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- ItemAcesso aberto (Open Access)Adaptação de prótese auditiva e a privação da audição unilateral: avaliação comportamental e eletrofisiológica(Associação Brasileira de Otorrinolaringologia e Cirurgia Cervicofacial, 2012-12-01) Wieselberg, Margarita Bernal [UNIFESP]; Iorio, Maria Cecilia Martinelli [UNIFESP]; Santa Casa de São Paulo Faculdade de Ciências Médicas; Universidade Federal de São Paulo (UNIFESP)The phenomenon of Late-Onset Unilateral Auditory Deprivation was first reported in 1984. However, a high number of unilateral hearing aid fittings are still carried out in cases of bilateral hearing loss, justified by non-auditory factors such as cost, vanity, misinformation and public health policies. OBJECTIVE: To carry out behavioral and electrophysiological assessment of the auditory performance of adults using unilateral amplification compared with individuals exposed to bilateral symmetric auditory stimulation. METHOD: Thirty five adults, all with symmetric bilateral sensorineural hearing loss, regular users of unilateral hearing aid, bilateral hearing aids and not users of hearing aids, were assessed on behavioral and electrophysiological tests. RESULTS: Variance analysis revealed that in the unilaterally fitted group, P300 latency was significantly greater in ears with auditory deprivation compared with those fitted with the hearing aid (p < 0.05). This same group also had poorer performance on the Sentence Recognition Test in Noise held in free field. CONCLUSION: These results corroborate findings in the literature showing that unilateral auditory deprivation can lead to physiological and perceptual changes.
- ItemAcesso aberto (Open Access)Auditory evoked potentials in premature and full-term infants(Associação Brasileira de Otorrinolaringologia e Cirurgia Cervicofacial, 2011-10-01) Porto, Maria Angelica de Almeida [UNIFESP]; Azevedo, Marisa Frasson de [UNIFESP]; Gil, Daniela [UNIFESP]; Medical Specialty Outpatient Unit; Universidade Federal de São Paulo (UNIFESP)Accurate information about type, degree, and configuration of hearing loss are necessary for successful audiological early interventions. Auditory brainstem response with tone burst stimuli (TB ABR) and auditory steady-state response (ASSR) exams provide this information. AIM: To analyze the clinical applicability of TB ABR and ASSR at 2 kHz in infants, comparing responses in full-term and premature neonates. MATERIAL AND METHOD: The study was cross-sectional, clinical and experimental. Subjects consisted of 17 premature infants and 19 full-term infants. TB ABR and ASSR exams at 2000 Hz were done during natural sleep. RESULTS: The electrophysiological minimum response obtained with TB ABR was 32.4 dBnHL (52.4 dBSPL); the ASSR minimum was 13.8 dBHL (26.4 dBSPL). The exams required 21.1 min and 22 min, respectively. Premature and full-term infant responses showed no statistically significant differences, except for auditory steady-state response duration. CONCLUSIONS: Both exams have clinical applicability at 2 kHz in infants, with 20 min of duration, on average. In general, there are no differences between premature and full-term individuals.
- ItemSomente MetadadadosAvaliação da função coclear e resposta tecidual da mucosa da cavidade timpânica de cobaia, quando receptora de implante biodegradável(Universidade Federal de São Paulo (UNIFESP), 2014-10-29) Garcia, Leandro de Borborema [UNIFESP]; Testa, Jose Ricardo Gurgel Testa [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Introduction:Treatment of cochlear disorders represents a promisingfuture in otology. Local drug delivery has distinct advantages for the treatmentof the inner ear disease. The developmentof prolonged drug delivery system, by biopolymers, may mean significant progress,once they are able to keep drug concentrations on the desired site within therapeutical levels for a long period of time. Objective: To evaluate the cochlear function and tissue response of the mucosa of the tympanic cavity of guinea pigs, when receiving biodegradable implant.Methods: A total of 20 male guinea pigs were divided into 2 groups. After paracentesis in both ears, a biodegradable polymer of poly lactic-co-glycolic acid was implanted in only one middle ear. Histological analysis using neutrophil exudate and vascular neoformation (acute inflammation) and fibroblast proliferation and mononuclear inflammatory cells (chronic inflammation) as parameters was performed after 10 and 30 days of survival (groups 1 and 2, respectively). The Brain Stem Auditory Evoked Potentials was made in all ears justbefore the implantation of the biopolymer and the euthanasia. Results:Four ears in group 1 and 7 in group 2 had an increase of neutrophil exudate. Vascular neoformation occurred in ears with or without the implant, in both groups. Fibroblast proliferation and mononuclear inflammatory cells (lymphocytes and macrophages) increased in ears with implant in group 2. None of the groups showed sensorineural hearing loss. Conclusion:The cochlear function and tissue response by histological analysis of the mucosa of the tympanic cavity of guinea pigs, when receiving biodegradable implant, showed no statistically significant difference between ears with or without the implant.
- 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.
- ItemSomente MetadadadosPotencial evocado auditivo de tronco encefálico por frequência específica: estudo da via aérea e via óssea em lactentes com alterações de orelha média(Universidade Federal de São Paulo (UNIFESP), 2014-12-15) Pereira, Priscila Karla Santana [UNIFESP]; Azevedo, Marisa Frasson de Azevedo [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Objetivo: Descrever os achados do potencial evocado auditivo de tronco encefálico por frequência específica (PEATE-FE) por via aérea e via óssea em lactentes com e sem alteração de orelha média e correlacioná-los com os achados do PEATE com estímulo clique. Método: Foram avaliados 73 lactentes com até 12 meses de idade. Os lactentes foram distribuídos em dois grupos num total de 134 orelhas, sendo 52 orelhas do grupo estudo (com alteração de orelha média) e 82 orelhas do grupo controle (sem alteração). Todos os lactentes foram submetidos à realização do PEATE (pesquisa de integridade de vias auditivas com clique a 80dBnNA e pesquisa do limiar eletrofisiológico com clique e toneburst) nas frequências de 500 e 2000 Hz por via aérea e via óssea. Resultados: Os limiares eletrofisiológicos médios para as frequências de 500 Hz e 2000 Hz no grupo controle foram 26,6 dBnNA e 21,5 dBnNA, por via aérea e 16,3 dBnNA e 21,3 dBnNA por via óssea, respectivamente. Os limiares médios para as frequências de 500 Hz e 2000 Hz no grupo estudo foram 46,6 dBnNA e 38,2 dBnNA, por via aérea e 18,5 dBnNA e 23,8 dBnNA por via óssea, respectivamente. Foram observadas latências das ondas I, III e V mais prolongadas no grupo estudo. O grupo estudo apresentou gap aéreo-ósseo maior que o grupo controle.Não houve associação significante entre: gap e o tipo de curva timpanométrica (tipo B ou C), e gap e latência da onda I a 80 dBnNA. Conclusões: O grupo estudo apresentou limiares eletrofisiológicos mais elevados independentemente do tipo de estímulo (clique e frequência específica) e condução (via aérea e via óssea). O limiar eletrofisiológico em 500 Hz foi maior que 2000 Hz por via aérea e menor por via óssea em ambos os grupos. As latências das ondas I, III e V foram mais prolongadas no grupo estudo, caracterizando a presença de comprometimento condutivo. O PEATE- FE é de fundamental importância para conclusão do diagnóstico, pois possibilita a determinação da configuração e do grau da perda auditiva por meio da condução aérea, e associada à pesquisa por meio da via óssea possibilita a determinação do tipo de perda auditiva. Dessa forma, com o diagnóstico mais preciso da perda auditiva é possível realizar uma intervenção adequada nos casos de alterações de orelha média em lactentes.