Navegando por Palavras-chave "Auditory Evoked Potentials"
Agora exibindo 1 - 6 de 6
Resultados por página
Opções de Ordenação
- ItemAcesso aberto (Open Access)Avaliação eletrofisiológica da audição em indivíduos após traumatismo cranioencefálico(CEFAC Saúde e Educação, 2013-02-01) Marangoni, Andréa Tortosa [UNIFESP]; Santos, Renata Beatriz Fernandes [UNIFESP]; Suriano, Ítalo Capraro [UNIFESP]; Ortiz, Karin Zazo [UNIFESP]; Gil, Daniela [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)PURPOSE: this study aimed to characterize brain stem auditory evoked potential and long latency auditory evoked potential in patients that suffered head trauma. METHOD: transverse clinical study performed on twenty normal hearing individuals divided in two groups paired for age and gender: a) ten individuals who suffered head trauma (trauma group); and b) ten individuals with no type of neurological alteration (control group). The individuals underwent a basic hearing evaluation as well as brain stem auditory evoked potential and long latency auditory evoked potential (P300) tests. RESULTS: on the brain stem auditory evoked potential, more prolonged absolute latencies of Waves I, III and V and the I-III inter-peak interval were found in the trauma group in comparison with the control group, with statistically significant differences with regard to the absolute latencies of Waves I and III in the right ear and both Wave III and the I-III inter-peak interval in the left ear. The amplitude of Waves I, III and V in the right ear and Waves III and V in the left ear were higher in the control group. Regarding P300, the trauma group displayed greater latency and lesser amplitude in both ears comparing with the control group, with no statistical significance. CONCLUSION: individuals that suffered head trauma display alterations in the brain stem auditory evoked potential and do not display significant differences with regard to long latency auditory evoked potential (P300) when compared to individuals with no brain injury.
- 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)Formal auditory training in adult hearing aid users(Faculdade de Medicina / USP, 2010-01-01) Gil, Daniela [UNIFESP]; Iorio, Maria Cecilia Martinelli [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)INTRODUCTION: Individuals with sensorineural hearing loss are often able to regain some lost auditory function with the help of hearing aids. However, hearing aids are not able to overcome auditory distortions such as impaired frequency resolution and speech understanding in noisy environments. The coexistence of peripheral hearing loss and a central auditory deficit may contribute to patient dissatisfaction with amplification, even when audiological tests indicate nearly normal hearing thresholds. OBJECTIVE: This study was designed to validate the effects of a formal auditory training program in adult hearing aid users with mild to moderate sensorineural hearing loss. METHODS: Fourteen bilateral hearing aid users were divided into two groups: seven who received auditory training and seven who did not. The training program was designed to improve auditory closure, figure-to-ground for verbal and nonverbal sounds and temporal processing (frequency and duration of sounds). Pre- and post-training evaluations included measuring electrophysiological and behavioral auditory processing and administration of the Abbreviated Profile of Hearing Aid Benefit (APHAB) self-report scale. RESULTS: The post-training evaluation of the experimental group demonstrated a statistically significant reduction in P3 latency, improved performance in some of the behavioral auditory processing tests and higher hearing aid benefit in noisy situations (p-value < 0,05). No changes were noted for the control group (p-value <0,05). CONCLUSION: The results demonstrated that auditory training in adult hearing aid users can lead to a reduction in P3 latency, improvements in sound localization, memory for nonverbal sounds in sequence, auditory closure, figure-to-ground for verbal sounds and greater benefits in reverberant and noisy environments.
- ItemAcesso aberto (Open Access)Função auditiva central e percepção visual de escolares submetidos á estimulação auditiva, visuomotora e neuroauditiva (SENA)(Universidade Federal de São Paulo (UNIFESP), 2019-06-18) Viacelli, Sandra Nunes Alves [UNIFESP]; Pereira, Liliane Desgualdo [UNIFESP]; http://lattes.cnpq.br/0546134611213515; http://lattes.cnpq.br/4417137094868095; Universidade Federal de São Paulo (UNIFESP)To verify the efficacy of an Intervention Program with three types of stimulation, performed in isolated and combined ways: NeuroAudiotive Stimulation (SENA); Visuomotor Stimulation; and, Acoustically Controlled Auditory Training (TAAC), in students‟ central auditory function and visual perception. Methods. Thirty students from 8 to 11 years old participated (15 boys). Children with normal auditory thresholds and difficulties in school learning were included, among those attended at the speech and language clinic of the institution. Children who were not willing to participate of the study, with evidence of neuropsychiatric disorders, altered auditory processing in one behavioral test only and normal visual perception during screening were excluded. The procedures were: evaluation of auditory processing (resolution and temporal ordering skills, figure-background in monotonic and dichotic listening and a questionnaire answered by parents about auditory behaviors in daily communication); SAB scale; visual perception evaluation (DTVP 2); and, evaluation of short evoked potential (FFR) and long latency (p300). The first evaluation performed was called time 1. After the first type of stimulation, the reevaluation was performed (time 2). After the program ended, last evaluation were performed (time 3). Children were submitted to a intervention program, with three different types of stimulation (seven and a half hours each): SENA, TAAC and VISUOMOTOR, presented in different sequences. First sequence was named GROUP 1 (SENA, VISOMOTOR, TAAC), the second one GROUP 2 (VISOMOTOR, SENA, and TAAC) and the third one, GROUP 3 (TAAC, SENA, and VISOMOTOR). Among the stimulations, two of them offered auditory stimulation, ie, TAAC and SENA, and the remaining one, visuomotor (placebo). TAAC was performed as used in clinical practice. SENA consisted of intermittent speech and music auditory stimulation, provided by headphones to the child while performing a motor activity through computer games. An analog converter was used, which allowed SENA application in three children at the same time. Visuomotor stimulation consisted of spatial orientation, balance, segmental limb awareness and visuomotor coordination activities, in groups of five children. Participants were distributed by convenience into each intervention group. The intervention groups age distribution was carefully xvi structured, being three children of 8 years, three children of 9 years, two of 10 years and two of 11 years of age, totalizing 10 participants per group. Results. A longitudinal analysis to verify the intervention program effectiveness showed a statistically significant difference between the three moments, for 95% of the analyzed variables. In a cross-sectional analysis to verify performance between groups at each time point, it was observed that at time 1 there were no statistically significant differences. At time 2 there was a statistically significant difference in E-wave latency in FFR and TPD in imitation and naming tasks for group 3, indicating effect of the intervention sequence that began with acoustically controlled auditory training. In addition, in SAB total score, we verified a statistically significant difference in performance for group 1, indicating the effect of intervention sequence that began with SENA. At time 3, statistical significance occurred for p3 latency in right and left ear in group 3, indicating effect of intervention sequence that began with acoustically controlled auditory training. Also in time 3, the improvement in TDD in group 1 left ear indicating effect of intervention sequence that began with SENA. Conclusion. There was efficacy of the therapeutic procedures used in the research. The best treatment options were group 1 (started by SENA) or group 3 (started by TAAC). The sequence should be defined by the diagnostic evaluation before the therapeutic course. We emphasize the results of this study should be interpreted in a partial way, since the sample does not allow generalizations, requiring additional research to better understand the findings for SENA.
- ItemAcesso aberto (Open Access)Potenciais evocados auditivos de média e longa latências em adultos com AIDS(Pró-Fono Produtos Especializados para Fonoaudiologia Ltda., 2006-08-01) Matas, Carla Gentile [UNIFESP]; Juan, Kleber Ramos De; Nakano, Renata Agnello; Universidade Federal de São Paulo (UNIFESP); Universidade de São Paulo (USP)BACKGROUND: middle and late latency auditory evoked potentials. AIM: to verify the occurrence of middle and late latency auditory evoked potentials disorders in adults with Acquired Immunodeficiency Syndrome (AIDS). METHOD: middle and late latency auditory evoked potentials of 8 individuals with AIDS, with ages ranging from 10 to 51 years, with normal hearing, or with sensoryneural hearing losses up to moderate, and normal results in the Auditory Brainstem Response, comparing the results with the responses obtained for a control group which was composed by 25 individuals, with ages ranging from 19 to 24 years, with no hearing complaints and with normal hearing and normal results in the Auditory Brainstem Response. RESULTS: the Pa wave latency and amplitude averages in the C3/A2 and C4/A1 modalities, and the average of the P300 wave were analyzed. No significant differences were observed in the Pa wave amplitude and latency averages between the groups, although a non-statistically significant increase was observed in the latency and a decrease in the amplitude of such wave for the research group in the C3/A2 modality. The latency of the P300 wave was significantly longer to the left for the research group. It was also observed a longer latency to the right, although this was not statistically significant. CONCLUSION: adult individuals with AIDS do not present alterations in the middle latency auditory evoked potential and do present alterations in the cognitive potential, indicating a disorder in the cortical regions of the auditory pathway and a deficit in the cognitive processing of auditory information for this population. Such findings stress the importance of a careful investigation of the auditory function of individuals with AIDS, thus favoring the therapeutic planning.
- ItemAcesso aberto (Open Access)Potenciais evocados auditivos em indivíduos acima de 50 anos de idade(Pró-Fono Produtos Especializados para Fonoaudiologia Ltda., 2006-12-01) Matas, Carla Gentile [UNIFESP]; Santos Filha, Valdete Alves Valentins Dos; Okada, Melissa Mitsue Cunha Pires [UNIFESP]; Resque, Juliana Reis; Universidade Federal de São Paulo (UNIFESP); Universidade de São Paulo (USP)BACKGROUND: auditory evoked potentials. AIM: to describe the results of brainstem auditory evoked potentials (PEATE), middle latency auditory evoked potentials (PEAML) and cognitive potential (P300) in individuals over 50 years. METHOD: this study was developed at the Speech and Hearing Investigation Laboratory in Auditory Evoked Potentials of the Speech-Language and Hearing Course of the Department of Physiotherapy, Speech-language and Hearing Sciences and Occupational Therapy of FMUSP. Twenty four subjects (45 ears) were evaluated through PEATE and P300, and only 18 of these subjects (36 ears) were evaluated through PEAML. All subjects had ages between 51 and 74 years and were divided in three groups: GI (50-59 years), GII (60-69 years) and GIII (70-79 years). All subjects presented either normal hearing or neurossensorial hearing loss of a moderate-severe level in the PEATE, and of a moderate level in the PEAML and in the P300. The frequency range evaluated in the PEATE and in the PEAML varied from 3000 to 6000Hz, while in the P300 it varied from 1000 to 1500Hz. For the statistical analyses of the data, the Kruskal-Wallis test, the Mann-Whitney test and the two proportion equality test were used. RESULTS: significant statistical differences were simultaneously observed between the groups for the interpeak I-V in the PEATE and for the Na wave latency in the PEAML - in the PEATE the difference was caused by GIII and in the PEAML it was caused by GI. A statistically significant difference between the groups was observed for the latency of the P300 component. Considerable alterations were also found regarding the quality of the responses of the auditory evoked potentials, indicating a strong correlation between the deterioration of the responses and the increase in age. CONCLUSION: the aging process of the auditory system progressively affects the auditory pathways throughout the brainstem and temporal lobe.