Navegando por Palavras-chave "evoked response"

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    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.
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    Graphic angle measure as an electrocochleography evaluation parameter
    (Assoc Brasileira Otorrinolaringologia & Cirurgia Cervicofacial, 2011-03-01) Lopes, Karen de Carvalho [UNIFESP]; Munhoz, Mario Sergio Lei [UNIFESP]; Santos, Marco Aurélio Rocha [UNIFESP]; Dutra Moraes, Marcio Flavio; Chaves, Adriana Gonzaga [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Universidade Federal de Minas Gerais (UFMG); Universidade de São Paulo (USP)
    To improve electrocochleography's diagnostic sensitivity in Meniere's disease - new assessment methods are being studied.Aim: To determine whether or not graphic angle measurement is sensitive and specific to Meniere's disease laboratorial diagnosis and if there is an increase in the electrocochleography's sensitivity and specificity when graphic angle measurements are associated with Summating Potential-Action Potential ratio (SP/AP ratio).Methods: Electrocochleography's was used to analyze 71 ears from 55 subjects: 41 patients with clinical diagnosis of Meniere's disease (MD group), and 14 healthy individuals as control (Group C). Graphic results were analyzed initially to obtain the SP/AP ratio; afterwards, through another program graphic angle measurements were calculated.Results: Sensitivity and specificity values of angle measures, SP/AP ratio, and the association between them varied according to the cutoff point, the highest equilibrium between sensitivity and specificity was observed with the values of 166.25 for angle measurement and 27% for SP/AP relation; 62.79% / 60.71% and 74.42% / 67.86%, respectively. The association between measurements showed a sensitivity increase due to the specificity decrease; 88.37% and 50%, respectively.Conclusion: Angle graphic measurement is not sensitive and specific enough for the laboratorial diagnosis of MD. Angle graphic measurement and SP/AP ratio association proved to be higher in sensitivity, in detriment of exam specificity.