Chapter

Brain Stem Auditory Evoked Potentials in Peripheral Acoustic Disorders

Christopher D. Bauch

in Clinical Neurophysiology

Third edition

Published on behalf of © Mayo Foundation for Medical Education and Research

Published in print April 2009 | ISBN: 9780195385113
Published online April 2013 | e-ISBN: 9780199322770 | DOI: http://dx.doi.org/10.1093/med/9780195385113.003.0021

Series: Contemporary Neurology Series

Brain Stem Auditory Evoked Potentials in Peripheral Acoustic Disorders

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Hearing sensitivity in the 2000–4000 Hz range is important to BAEP assessment. Absolute latencies and interaural latency differences are often affected by increasing degrees of hearing loss in this frequency range, whereas interpeak intervals are relatively stable measures, even for patients with moderate-to-severe degrees of peripheral hearing loss. However, the reduction in amplitude or the absence of a measurable wave I associated with peripheral hearing losses often makes it difficult or impossible to measure I–III or I–V intervals. Overall sensitivity of BAEP is 92% for patients with a CN VIII tumor. The false-positive rate for patients with cochlear hearing loss is 12%. Tumor size influences BAEP test results: the sensitivity is 100% for CN VIII tumors larger than 2 cm, but it is only 82% for CN VIII tumors 1 cm or smaller.

Chapter.  2960 words.  Illustrated.

Subjects: Neurology

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