ROBERTO MIQUELINO DE OLIVEIRA BECK
Projetos de Pesquisa
Unidades Organizacionais
Instituto Central, Hospital das Clínicas, Faculdade de Medicina
LIM/32 - Laboratório de Otorrinolaringologia, Hospital das Clínicas, Faculdade de Medicina
LIM/32 - Laboratório de Otorrinolaringologia, Hospital das Clínicas, Faculdade de Medicina
5 resultados
Resultados de Busca
Agora exibindo 1 - 5 de 5
bookPart Métodos Objetivos de Avaliação Audiológica(2014) GRASEL, Signe Schuster; BECK, Roberto Miquelino de Oliveira; RAMOS, Henrique Faria; ROSSI, Amanda Costa; ALMEIDA, Edigar Rezende de- Are Auditory Steady-State Responses Useful to Evaluate Severe-to-Profound Hearing Loss in Children?(2015) GRASEL, Signe Schuster; ALMEIDA, Edigar Rezende de; BECK, Roberto Miquelino de Oliveira; GOFFI-GOMEZ, Maria Valeria Schmidt; RAMOS, Henrique Faria; ROSSI, Amanda Costa; TSUJI, Robinson Koji; BENTO, Ricardo Ferreira; BRITO, Rubens deObjective. To evaluate Auditory Steady-State Responses (ASSR) at high intensities in pediatric cochlear implant candidates and to compare the results to behavioral tests responses. Methods. This prospective study evaluated 42 children with suspected severe-to-profound hearing loss, aged from 3 to 72 months. All had absent ABR and OAE responses. ASSR were evoked using binaural single frequency stimuli at 110 dB HL with a 10 dB down-seeking procedure. ASSR and behavioral test results were compared. Results. Forty-two subjects completed both ASSR and behavioral evaluation. Eleven children (26.2%) had bilateral responses. Four (9.5%) showed unilateral responses in at least two frequencies, all confirmed by behavioral results. Overall 61 ASSR responses were obtained, most (37.7%) in 500 Hz. Mean thresholds were between 101.3 and 104.2 dB HL. Among 27 subjects with absent ASSR, fifteen had no behavioral responses. Seven subjects showed behavioral responses with absent ASSR responses. No spurious ASSR responses were observed at 100 or 110 dB HL. Conclusion. ASSR is a valuable tool to detect residual hearing. No false-positive ASSR results were observed among 42 children, but in seven cases with absent ASSR, the test underestimated residual hearing as compared to the behavioral responses.
bookPart Imitanciometria(2014) GRASEL, Signe Schuster; BECK, Roberto Miquelino de Oliveira; GUEDES, Mariana Cardoso; ALMEIDA, Edigar Rezende de; ROSSI, Amanda Costa- Are auditory steady-state responses a good tool prior to pediatric cochlear implantation?(2015) BECK, Roberto Miquelino de Oliveira; GRASEL, Signe Schuster; RAMOS, Henrique Faria; ALMEIDA, Edigar Rezende de; TSUJI, Robinson Koji; BENTO, Ricardo Ferreira; BRITO, Rubens deIntroduction: ASSR allow frequency-specific evaluation in intensities up to 120 dB HL and detection of residual hearing in patients with severe-to-profound hearing loss. Aim: to compare ASSR thresholds and behavioral test results in children with suspected severe-to-profound hearing loss. Methods: Cross sectional study to compare ASSR and behavioral responses (VRA or audiometry) in 63 pediatric cochlear implant candidates (126 ears) aged between 6 and 72 months. We included children with normal otomicroscopy, absent responses to click-ABR and otoaccoustic emissions. We excluded children with inner ear malformations, auditory neuropathy spectrum disorder or who did not complete VRA or achieve EEG noise < 30 nV during the ASSR test. Air-conduction ASSR stimuli were continuous sinusoidal tones presented at 0.5, 1, 2 and 4 kHz starting at 110 dB HL Behavioral thresholds were acquired with warble tones presented at 0.5, 1, 2 and 4 kHz in each ear through insert or head phones at maximum presentation level of 120 dB HL Results: Behavioral thresholds were obtained in 36.7% (185/504) of all frequencies in all subjects, 9% in intensities >110 dB HL. Among 504 ASSR measurements, 53 thresholds were obtained (10.5%). Overall 89.5% of the tested frequencies did not show any response at 110 dB HL Most responses were at 500 Hz. Mean differences between behavioral and ASSR thresholds varied from 0.09 to 8.94 dB. Twenty-seven comparisons of behavioral and ASSR thresholds were obtained: 12 at 0.5 kHz, 9 at 1 kHz, Sat 2 kHz and 1 at 4 kHz. Absent responses were observed in both tests in 38.1% at 0.5 kHz, 52.4% at 1 kHz, 74.6% at 2 kHz and 81.0% at 4 kHz. Specificity was > 90% at 1,2 and 4 kHz. In ears with no behavioral response at 120 dB HL all ASSR thresholds were in the profound hearing loss range, 90% of them were >110 dB HL Conclusion: Among 63 pediatric CI candidates, absent responses to high-intensity ASSR was the major finding (specificity > 90%) predicting behavioral thresholds in the profound hearing loss range. These findings can be helpful to confirm the decision for cochlear implantation.
- Estudo comparativo entre audiometria tonal limiar e resposta auditiva de estado estável em normouvintes(2014) BECK, Roberto Miquelino de Oliveira; RAMOS, Bernardo Faria; GRASEL, Signe Schuster; RAMOS, Henrique Faria; MORAES, Maria Flavia Bonadia B. de; ALMEIDA, Edigar Rezende de; BENTO, Ricardo FerreiraIntroduction: Auditory steady-state responses (ASSR) are an important tool to detect objectively frequency-specific hearing thresholds. Pure-tone audiometry is the gold-standard for hearing evaluation, although sometimes it may be inconclusive, especially in children and uncooperative adults. Aim: Compare pure tone thresholds (PT) with ASSR thresholds in normal hearing subjects. Materials and methods: In this prospective cross-sectional study we included 26 adults (n = 52 ears) of both genders, without any hearing complaints or otologic diseases and normal pure-tone thresholds. All subjects had clinical history, otomicroscopy, audiometry and immitance measurements. This evaluation was followed by the ASSR test. The mean pure-tone and ASSR thresholds for each frequency were calculated. Results: The mean difference between PT and ASSR thresholds was 7,12 for 500 Hz, 7,6 for 1000 Hz, 8,27 for 2000 Hz and 9,71 dB for 4000 Hz. There were no difference between PT and ASSR means at either frequency. Conclusion: ASSR thresholds were comparable to pure-tone thresholds in normal hearing adults. Nevertheless it should not be used as the only method of hearing evaluation.