1992/06/01 by Samuel C. Levine, Robert H. Margolis, Eric M. Fournier +1 · 2 citations
Neuroscience · Medicine · #Vestibular and auditory disorders #Hearing, Cochlea, Tinnitus, Genetics #Glaucoma and retinal disorders
paper · doi:10.1288/00005537-199206000-00005
There has been increased interest in electrocochleography for the diagnosis and intraoperative monitoring of patients with endolymphatic hydrops. Attention has been focused on the determination of the summating potential:action potential (SP:AP) ratio from alternating polarity clicks. Review of this technique at the University of Minnesota led to a reevaluation of the usual interpretation of these recordings. Separate examination of the rarefaction and condensation click recordings provides insight into abnormal response patterns. Cases are presented to illustrate a variety of normal and abnormal patterns including abnormal differences in the latency of condensation and rarefaction-click-generated action potentials, increased summating potential, uncanceled cochlear microphonic, and reduced action potential and summating potential amplitudes. These response categories may be useful in understanding the pathophysiology of Meniere's disease.