[Coefficient of activation of the brain subcortex structures in a comatose state].

The brain bioelectric activity changes in patients, suffering comatose state, may not be revealed by electroencephalography (EEG) data. This obstacle makes difficult to accomplish the patient functional state estimation and restricts the conducted treatment efficacy. That's why there was elaborated a quantitative diagnostic criterion of EEG--coefficient of a subcortex activation, permitting precisely and objectively to estimate the changes of functional state of the comatose patient brain.

[The functional status of the brain in patients with abdominal aortic aneurysm].

We performed electroencephalography to 11 patients with abdominal aortic aneurysm in order to investigate the functional status of the brain. The relative potency (RP) of the main rhythms (alpha, beta, teta and delta) was increased, as well as the beta/alpha activation ratio. The increase of low-frequency rhythms (delta and teta) indicates the brain cortex hypoxia.

[Electroencephalographic indices in concussion of the brain].

In 13 patients (7 men and 6 women) aged 19-44 yrs, 28 yrs at average, suffering symptoms of giddiness, nausea, vomiting, unconsciousness, the functional state of brain, using electroencephalography, was investigated. In 62% patients, according to the background electroencephalography data, the total power of low rhythms (teta + delta) had exceeded the total power of rapid rhythms (alfa + beta) in every 11 (68%) investigated brain dots of total 16. Quantitative diagnostic criterion for the brain commotion diagnosis confirmation was created, basing on the investigation results analysis performed: the total power of a slow rhythms exceeding over total power of rapid rhythms in majority (more than 68%) of the brain investigated region dots.

[The external respiration function in patients with purulent-septic complications].

In 7 patients with postoperative purulent-septic complications the external respiration function (ERF) was studied. Preoperatively in them were observed significant changes of the ERF speed characteristics. The average volume speed in 25-75% interval (AVS 25-75) of the forced vital pulmonary capacity (FVPC) was lower than normal level by 43%, the extreme volume speed (EVS) of FVPC--by 49%, the moment volume speed in inspiration 50% of FVPC (EVS 50)--by 42%, EVS in expiration 75% of FVPC (MOS 75)--by 48%.

[Peculiarities of the brain bioelectrical activity in patients with atherosclerotic lesions of extracranial branches of the aortal arch].

Bioelectrical activity of the brain was studied in 12 patients with atherosclerotic affection of extracranial branches of aortal arch, using electroencephalography method, tests with hyperventilation and nitroglycerin loading. It was established that in lowering of the blood flow along extracranial vessels the brain functional state is not always disturbing. In 50% of patients the hypoxia signs were not revealed.

[The characteristics of the alpha-rhythm electroencephalogram in patients with liver cirrhosis].

The brain functional state in patients with liver cirrhosis was investigated, the correlational dependence between the intrinsically present alpha-rhythm of electroencephalogram pattern of examined patients and the brain reactions signs while the functional tests conduction was studied up. The data obtained are compared with the results of such investigations, conducted in healthy persons. The results of investigations witness the brain functional possibilities lowering in patients with liver cirrhosis.

[Investigation of the brain reactiveness depending on the type of human intrinsically present electroencephalography].

While adopting the lighting flashes 9 Hz in frequency, and while the absence of the adopting the rythm reaction during the photostimulation conduction in majority of the patients examined the alpha-oscillations amplitude according to background electroencephalography constitutes 25-50 mcV; while adopting of the lighting flashes rythm with 6 and 12 Hz frequency--50-75mcV.

[Brain function in patients with atherosclerotic circulatory encephalopathy].

Based on the analysis of findings from clinical and paraclinical investigations (ultrasonic vascular diagnosis, electroencephalography, computerized tomography, angiography) in 244 patients with atherosclerotic dyscirculatory encephalopathy, functional status was studied as were structural alterations in the brain tissue in stenosing lesions of precerebral arteries. The first clinical manifestations of atherosclerotic dyscirculatory encephalopathy in the presence of damage to the vestibular-basilar system were found to be dysfunction of column structures of vestibular apparatus, reticular formation and posterior longitudinal fascicle, and, in the presence of damage to the carotid area, -- dysfunction of cortex of frontal, parietal and temporal lobes of the brain.