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Original Article

Auditory brainstem response threshold estimation: subjective threshold estimation by experienced clinicians in a computer simulation of the clinical test

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Pages 417-429 | Received 30 May 2002, Accepted 10 Sep 2003, Published online: 07 Jul 2009
 

Abstract

Little research has been undertaken into the extent to which auditory brainstem response (ABR) threshold estimation varies between experienced professionals. In this paper, results are presented for 16 professionals who estimated ABR threshold for 12 sets of data in a computer simulation of the clinical test. The design differs from previous research in this area in that subjects had control over the creation of the set of traces from which they would estimate threshold, much as they would in the clinical situation. No agreement for threshold was found for any of the 12 sets of test data across the 16 subjects, and for nine of the sets, the difference between highest and lowest estimated threshold was 40 dB or greater. The maximum difference between highest and lowest estimated threshold was 60dB. It is argued that the variability is not accounted for by experimental design. The implications for clinical practice are discussed.

Sumario

Poca investigación se ha realizado sobre cuánto varían, entre profesionales con experiencia, las estimaciones de los umbrales en las respuestas auditivas del tallo cerebral (ABR). En este artículo, se presentan los resultados generados por 16 profesionales que estimaron los umbrales de los ABR en 12 juegos de datos, en una simulación por computadores de dicha prueba clínica. El disen˜o difiere de las investigaciones previas en que los sujetos tuvieron control sobre la creación de un juego de trazos a partir de los cuales estimarían el umbral, tal y como ocurrirían en una situación clínica. No se logró acuerdo entre los 16 sujetos sobre dicho umbral en ninguno de los doce juegos de datos, y en 9 de los mismos, las diferencias entre los umbrales estimados más altos y los más bajos fue de 40 dB o mayor. La diferencia máxima entre el umbral estimado más alto y el más bajo fue de 60dB. Se argumenta que la variabilidad no depende del disen˜o experimental. Se discuten las implicaciones para la práctica clínica.

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