Auditory Brain-stem Response and Acoustic Reflex Test: Results for Patients With and Without Tumor Matched for Hearing Loss

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Abstract
Auditory brain-stem response (ABR) and acoustic reflex test (ART) results were reviewed for 30 patients with cerebellopontile angle tumors and for 30 patients without tumor. Patients included in the nontumor group were selected to match the audiometric configurations for individual patients in the tumor group. The ABR waveforms were abnormal for all but 1 of the patients with tumor and for 7 of the patients without tumor. The ART results were abnormal for 25 of the patients with tumor and 2 of the patients without tumor. Patients without tumor yielding abnormal ABR results usually had more severe hearing losses than the patients without tumor who demonstrated normal ABR waveforms. The ABR and ART merit continued use in the audiologic examination of patients suspected of having retrocochlear lesions, but the degree of hearing loss and other medical information must also be considered when retrocochlear lesions are suspected.

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