RESUMO
OBJECTIVE: The purpose of this study was to evaluate whether auditory brainstem responses (ABR) in multiple sclerosis (MS) patients were qualitatively different from a normal population. MATERIAL AND METHOD: This study analysed 69 subjects, separated into two groups; a control group composed of 20 females and 20 males; and an MS group composed of 20 females and 9 males. The controls had no history of neurological or otorhinolaryngological disorders. All MS patients presented a normal magnetic resonance imaging of the brainstem. A definite diagnosis of MS was given according to Poser's criteria for MS research protocols (1983). The following parameters were used in the study of the ABR of each subject: 2000 clicks of 100 ms at 60 dB equivalent peak of sou nd pressure level (pe SPL) above the psycho-acoustic threshold, obtained with the subject's response to clicks. Both ears were initially stimulated at 11 clicks/s, and then with clicks of same intensity, but with a progressive increase of the stimulus rate to 31, 51, 61 and 71 clicks/s. The analysis of variance with independent factors and repeated measures was used in the statistical analysis of the comparison between group results. RESULTS: The absolute latency of wave III was statistically greater, with a stimulus rate of 51 and 61 clicks/s, in the MS group. The males in the MS group presented a statistically greater absolute latency of wave V with the use of 51 and 61 clicks/s. With stimulus rates above 30 clicks/s, the absolute latency of wave V was also greater for MS females. There were statistically significant differences in the interpeak interval I - III of the control group compared to the MS group, for stimulus rates of 51 and 61 clicks/s, in females and for the stimulus rate of 61 clicks/s in males. This interval was higher in the MS group with these stimulus rates. CONCLUSION: The results suggest the inclusion of stimulus rates of 51 and 61 clicks/s in the ABR tests of subjects with clinical suspicion of demyelinating diseases like MS.
Assuntos
Estimulação Acústica , Potenciais Evocados Auditivos/fisiologia , Esclerose Múltipla/diagnóstico , Esclerose Múltipla/fisiopatologia , Periodicidade , Adulto , Audiometria/métodos , Diagnóstico Diferencial , Potenciais Evocados Auditivos do Tronco Encefálico/fisiologia , Feminino , Humanos , Masculino , Índice de Gravidade de DoençaRESUMO
A group of 16 children, aged from 8 to 14 years, with learning disabilities, were studied by means of a series of conventional and sensitized audiological tests, including recording of the late cognitive electrical responses (P300). They had no otolaryngological or neurological complaints but expressive language disorders (difficulties in speaking and/or writing), receptive language disorders (difficulties in reading and text comprehension), and lack of concentration and/or restlessness. Their audiograms, speech discrimination and immitance tests were normal. The P300 responses, as compared with those found in 20 normal controls within the same age group, occurred at significantly longer latency periods.
Assuntos
Potenciais Evocados P300 , Deficiências da Aprendizagem/fisiopatologia , Estimulação Acústica , Adolescente , Audiometria de Tons Puros , Percepção Auditiva , Criança , Transtornos do Comportamento Infantil/fisiopatologia , Humanos , Deficiências da Aprendizagem/complicações , Tempo de Reação , Testes de Discriminação da FalaRESUMO
A case of cavernous hemangioma in the internal auditory canal was reported. There were no specific symptoms or physical or neurotological findings to differentiate from acoustic neuroma. The clinical and surgical aspects of this rare tumor were reviewed and discussed.
Assuntos
Neoplasias da Orelha , Hemangioma Cavernoso , Doenças do Labirinto , Adulto , Neoplasias da Orelha/diagnóstico , Neoplasias da Orelha/cirurgia , Hemangioma Cavernoso/diagnóstico , Hemangioma Cavernoso/cirurgia , Humanos , Doenças do Labirinto/diagnóstico , Doenças do Labirinto/cirurgia , Masculino , Osso TemporalRESUMO
A Prova Rotatoria Pendular Decrescente foi realizada em 36 individuos normais, com o intuito de se avaliar o comportamento dos valores absolutos e relativos da velocidade angular real maxima, da componente rapida do nistagmo per-rotatorio a vecto-electronistagmografia. Verificou-se, que foi possivel estabelecer estatisticamente limites criticos normais dos valores desse parametro, que podem ser uteis para a identificacao da hiporreflexia, hiperreflexia e preponderancia direcional do nistagmo, na patologia concernente a otoneurologia