Low-frequency auditory brainstem response threshold.
Auditory brainstem thresholds have been determined in 35 non-cooperative, anaesthetized children using a 'two-point audiogram' paradigm. The high-frequency point was found with a 2 kHz tone-burst without masking, and the low-frequency with a 0.5 kHz tone-burst together with 1 kHz high-pass noise masking. Great variability was found in the low-frequency thresholds, and only 3 of 18 ears with normal high-frequency thresholds had low-frequency thresholds below 70 dB nHL. It is concluded that the 0.5 kHz tone-burst with 1 kHz high-pass noise masking is not a reliable method for routine assessment of low-frequency auditory threshold at the brainstem level.
Laukli
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Department of Otorhinolaryngology, University of Tromsø, Norway.
Fjermedal
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Mair
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D000293:Adolescent; D001300:Audiometry, Evoked Response / Q000379:methods; D001309:Auditory Threshold; D001933:Brain Stem / Q000502:physiology; D002648:Child; D002675:Child, Preschool; D006311:Hearing Disorders / Q000175:diagnosis; D006801:Humans; D007223:Infant