Navegando por Palavras-chave "auditory"
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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)Musical rhythms and their influence on P300 velocity in young females(Assoc Brasileira Otorrinolaringologia & Cirurgia Cervicofacial, 2011-03-01) Sa, Cintia Ishii de; Pereira, Liliane Desguado [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Exposure to music may be useful in the P300 retest and avoid habituation.Aim: To verify the influence of the exposure to different kinds of music in P300 in young females.Study design: Clinical prospective.Material and Method: Forty-five women aged from 20 to 36 years were evaluated. P300 was studied before and after musical stimulation with different rhythms. Brazilian songs, international songs, and classical music melodies were selected. Each song had its velocity altered and was named as fast and slow. Subjects were divided into 2 groups exposed to music: one group was exposed to the fast version and the other to the slow version. The control group not exposed to music and was evaluated within the same time period of the others.Result: There were statistically significant differences when comparing P300 amplitude in the first and third stimulation with the comparison group.Conclusion: In the same subject, several sequential registrations of P300 caused habituation, which was not seen during exposure to music before P300 recording. Exposure to music at preset different velocities did not affect the P300 in young females.