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Neuroophthalmological characteristics of children with congenital and acquired neurosensory hearing loss

Poster Details

First Author: I. Abdukadirova UZBEKISTAN

Co Author(s):    D. Makhkamova                    

Abstract Details


Study of clinical and neuroophthalmological features in patients with sensorineural hearing loss


T?shkent Institute of Postgr?du?te Medic?l Educ?tion


Clinical observation included 60 patients aged 3 to 6 years. The patients underwent an audiological examination with a computer audiometric method. Registration of the total bioelectric activity of the brain (EEG), isolation and analysis of visual evoked potentials was carried out using a computer encephalography. When analyzing the material obtained, the components of the evoked potential were isolated: P1 (positive - up to 60 ms), N1 (negative - up to 75 ms), P2 (up to 140 ms), N2 (up to 170 ms), P3 (up to 220 ms), N3 ( up to 260 ms), P4 (300) (up to 320 ms)


The hearing loss of 2 deg. - in 10, 3 deg. - in10, 4 degrees - in 40 patients. In children with hearing impairments of 3-6 years old, the maximum for the P1 component was in the occipital region, and in children with congenital neurosensory hearing loss - in the right, and in children with acquired - in the left. In these areas of the brain, an asymmetry in the formation of the N1 component was found: in children with acquired neurosensory hearing loss - mainly in the right , and in children with congenital - in the left hemisphere.


As a result of the study of the characteristics of visual evoked potentials in children with neurosensory hearing loss, data were obtained indicating the existence of a relationship between the degree and nature of the dysfunction of the central nervous system and their influence on the generation of VEP components. Low coherence between brain regions in hearing impaired children characterizes the functional insufficiency of the fronto-occipital and interhemispheric connections of the cerebral cortex, and also manifests itself in a decrease in attention function.

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