Bone conduction masking for brainstem auditory-evoked potentials (BAEP) in pediatric audiological evaluations. Validation of the test.
A brainstem auditory-evoked potential (BAEP) protocol for testing pediatric patients at risk for conductive hearing impairment was evaluated. The protocol used was: air-conducted click stimuli masked by bone-conducted wide-band noise. The specificity and sensitivity values for the test were determined by means of a blind cross-sectional trial including an active group of patients with an aural malformation and an age-matched control group with a sensorineural impairment. The bone-conducted masking of air-conducted BAEP showed high specificity and sensitivity and was easily administered despite pediatric difficulty. It was useful in differentiating sensorineural from conductive impairment and provided a rough estimate of the cochlear reserve in presumptive conductive hearing loss as great as 60 dB hearing loss. It is concluded that the bone-conducted masking procedure appears to be a great help in the binary decision whether middle ear surgery should be performed in patients at risk for conductive hearing loss, specially children with aural malformations.
D000293:Adolescent; D001300:Audiometry, Evoked Response; D001309:Auditory Threshold; D001844:Bone Conduction; D001933:Brain Stem / Q000503:physiopathology; D002648:Child; D002675:Child, Preschool; D003937:Diagnosis, Differential; D004431:Ear, External / Q000002:abnormalities; D005072:Evoked Potentials, Auditory; D034381:Hearing Loss / Q000175:diagnosis*; D006314:Hearing Loss, Conductive / Q000175:diagnosis* / Q000503:physiopathology; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis / Q000503:physiopathology; D006801:Humans; D012306:Risk