Acoustic evoked myogenic potentials (aemps) as a method to differentiate perceptive hearing loss (snhl and echl)
Abstract
Objective of this paper was registered of late component of acoustic evoked myogenic potentials (AEMPs), estimate its values of parameters and its usefulness to differencing between sensorineural hearing loss and extracochlear hearing loss and also compare results of ABR and AEMPs in differing perceptive hearing loss. A prospective analysis was done. One hundred twenty seven persons aged 14-77 were put under observation. On the basis of the tone threshold audiometer results, the SISI test and the stapedial muscle response the type of hearing damage was established. All studied population was divided into four groups ( healthy persons – group 1, sensorineural hearing loss persons – group 2, extracochlear hearing loss persons – group 3 and total deafness persons – group 4). BERA recordings and AWMP test were carried out The latency differences and interlateral latency of BERA and latency and amplitude of late AEMP component – n34p44 waves were accounted.
The wave ipsi n34p44 was recorded in 97.27% of the examined after healthy ears stimulation. More seldom was it obtained after ear stimulation in the poor hearing (groups II and III).. The late AWMP component – n34p44 waves in group IV was absent.
No differences of amplitude n34p44 depending on the hearing threshold were discovered. It was stated that the late waves occurred noticeably earlier in the patients with sensorineural hearing loss and much later in the patients with extracochlear damage comparing with the healthy. In the examination of the stimulus intensity function- latency, stimulus intensity- amplitude vital differences in the course of the curves between the groups with perceptive hearing loss were detected so this test allows to differentiate the types of perceptive hearing loss and presumably more precise than the BERA test.
