[Value of dynamic recording of short-latency auditory evoked potentials in the diagnosis and pathogenetic characteristics of hearing loss in acoustic neuroma].
Short-latency acoustic evoked potentials (SAEP) were recorded in 40 patients with vestibulocochlear neurinoma and 15 patients with unilateral cochlear hypoacusis. The results were compared with their psychophysical audiometric parameters. In the case of neurinoma, electric responses typically showed elongation of single waves and intervals between two peaks. In addition, they also displayed two other features. One of them was horizontal or ascending configuration of the curve reflecting the latency/intensity function. This indicates the absence of an electrophysiological equivalent of the phenomenon of loudness increment acceleration and, in more general terms, the stability of responses: lack of SAEP wave shortening and enhancement of acoustic stimulation level. The second feature was deterioration of the pattern and disintegration of individual complexes with a greater number of realizations. This can be attributed to the lability of nervous structures, in the case of neurinoma. This feature may also be responsible for the generally recognized concept that in neurinoma primary SAEP waves are not detectable when the routine method of recording responses to a large number of stimuli is used. These parameters are pathognomonic of neurinoma of the vestibulocochlear nerve and are never identified in the case of unilateral hypoacusis caused by cochlear lesions.
B M
BM
Sagalovich
V V
VV
Klimov
R I
RI
Itina
D004428:Ear Neoplasms / Q000175:diagnosis / Q000503:physiopathology*; D005072:Evoked Potentials, Auditory; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology*; D006320:Hearing Tests; D006801:Humans; D007759:Labyrinth Diseases / Q000175:diagnosis / Q000503:physiopathology; D009464:Neuroma, Acoustic / Q000175:diagnosis / Q000503:physiopathology*; D013997:Time Factors
Znachenie dinamicheskoĭ registratsii korotkolatentnykh slukhovykh vyzvannykh potenysialov dlia diagnostiki i patogeneticheskoĭ kharakteristiki tugoukhosti pri nevrinome slukhovogo nerva.