Potenciais evocados auditivos por frequência específica em lactentes com audição normal
Frequency-specific Auditory Brainstem Response in infants with normal hearing Auditory evoked potentials
Mabel Gonçalves Almeida; Gabriela Ribeiro Ivo Rodrigues; Doris Ruthy Lewis
Resumo
Objetivo: determinar os níveis mínimos de resposta (NMR) e a latência da onda V em lactentes ouvintes nas frequências de 0.5, 1, 2 e 4 kHz.
Método: foram avaliados 23 lactentes sem indicadores de risco para deficiência auditiva que apresentavam emissões otoacústicas evocadas por estímulo transiente (EOAET) e potenciais evocados auditivos de tronco encefálico automático (PEATE-A) presentes bilateralmente.
Resultados: obtiveram-se NMR médios de 34.2 dBnNA, 25.4 dBnNA, 19 dBnNA e 17.5 dBnNA para as frequências de 0.5, 1, 2 e 4 kHz, respectivamente. Os tempos médios de latência da onda V em 70 e 20 dBnNA, respectivamente, na frequência de 0.5 kHz foram de 10.75 ms e 15.2 ms, em 1 kHz de 8.9 ms e 13.4 ms; de 7.7 ms e 10.2 ms em 2 kHz, e para 4 kHz foram de 7.3 ms e 9.4 ms.
Conclusão: os valores encontrados podem ser utilizados na prática clínica para orientar o diagnóstico diferencial da perda auditiva, complementando a avaliação auditiva de lactentes.
Palavras-chave
Abstract
Purpose: to determine the ABR thresholds and the latency of V wave in hearing infants at the frequencies: 0.5, 1, 2 and 4 kHz.
Method: 23 infants with no risk factors concerning hearing loss that had transient otoacoustic emissions (TOAE) and automatic auditory brainstem response (A-ABR), bilaterally present, were evaluated.
Results: ABR thresholds were obtained in average, namely: 34.2 dBHL, 25.4 dBHL, 19 dBHL and 17.5 dBHL for frequencies of 0.5, 1, 2 and 4 kHz, respectively. The mean latency of V wave at 70 and 20 dBHL, respectively, at a 0.5 kHz frequency were 10.75 ms and 15.2 ms, 1 kHz 8.9 ms and 13.4 ms; 7.7 ms and 10.2 ms at 2 kHz, and as for4 kHz they were 7.3 ms and 9.4 ms.
Conclusions: the found values can be used in clinical practice in order to guide the differential diagnosis of hearing loss, complementing the evaluation as for hearing infants.
Keywords
References
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Submitted date:
12/16/2009
Accepted date:
03/24/2010
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