BIOELECTRICAL ACTIVITY OF THE BRAIN IN PERSONS WHO GET ACOUSTIC TRAUMA IN THE ZONE OF THE REALISATION OF COMBAT ACTIONS, WITH A DIFFERENT DEGREE OF VIOLATION OF AUDITORY FUNCTION
T.A. Shydlovska1, T.V. Shydlovska1, M.S. Kozak1, K.V. Ovsyanik1, L.G. Petruk2
- State Institution “Institute of Otolaryngology O.S. Kolomiychenko NAMS of Ukraine ”, Kyiv, Ukraine
- Otolaryngology Clinic of the Military Medical Clinical Center of the Southern Region, Odessa, Ukraine
The purpose of our work is the determination of the most
significant indicators of bioelectic activity of the brain
based on the results of electroencephalography (EEG) in
persons who get acoustic trauma in the zone of realization
of military operations, taking into account the degree of
violations of the auditory function. A group of servicemen
with acoustic trauma (205 people) was examined with the
most typical forms of audiometric curves - with a downward,
often - ubrupt type of the curve, who were divided into three
groups, depending on the severity of sensorineural hearing
loss. The research was carried out using the computer
electroencephalograph of the firm “DX-System” (Ukraine)
according to the generally accepted method according to the
scheme of electrode overlaying “10-20”. It has been shown
that changes in the bioelectric activity of the brain in patients
with acoustic trauma have been characterized by deformation
of the dominant rhythm with poor modulation and weakening
of the response to functional loads, especially in the frontal
and temporal directions. They significantly decreased the
percentage content of the α-rhythm dominant in the normal
EEG picture and increased the representation of the β- and
Δ-rhythm, both in the background recording and in the case of
functional photo stimulation and hyperventilation. The most
significant changes in bioelectrical activity compared with the
control group were observed in persons of the 2nd (more severe
hearing impairment) and 3rd (with severe violations of the
auditory function) groups. For example, in the 3rd group in the
background, the Δ-rhythm content in the frontal leads increased
to 19,74±1,53 % relative to 8,5 ± 1,6 % in the control group.
The comparative analysis of the percentage of EEG rhythms
conducted between the groups under study shows that from
1 to 3, the representation of the Δ, θ and β-rhythm increases,
and the α-rhythm particles decrease as with the background
record, so and with functional on-loadings. In the 3rd group,
in the frontal leads, a significant difference was observed in
the percentage values of all of the major EEG rhythms under
study (α, β, θ, Δ), both in the background recording and in
functional loadings. For example, the percentage of Δ-rhythm
in the frontal leads with a background note was 19,47 ±
1,53 %, which significantly differs from the indicators of the
1st – 13,69 ± 0,68 % and the 2nd group – 13,04 ± 0,52 %. Thus,
persons with combat acoustic trauma revealed a violation of
the bioelectric activity of the brain. Together with a decrease of
auditory function there is a redistribution of the basic rhythms
of the EEG in the direction of increasing the manifestations of
slow-wave activity on the disorganized background, especially
in the frontal and temporal directions.
auditory analyzer, acoustic trauma, central nervous system, bioelectrical activity of the brain.
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