Gamma activity of the brain in patients with hemisphere ischemic stroke

Objective . The aim of the study was to investigate gamma activity in patients with hemispheric ischemic stroke (HIS) in the acute and subacute periods in correlation with cognitive and anxiety-depressive disorders. Material and methods. The study included 32 patients with hemispheric ischemic stroke. All patients underwent comprehensive clinical, neurological, instrumental and laboratory studies. EEG was recorded on the 1st and 21st days of the disease for 20 minutes. EEG was analyzed visually and by mathematical analysis. The method of mathematical analysis was used to estimate the average values of the gamma rhythm power spectrum in the range of 30-45, 50–70 and 80–100 Hz for all leads and the peak frequency of the γ rhythm of the background EEG. Results . Mathematical analysis of bioelectrical activity (BEA) of the brain of patients with HIS showed deviations in gamma rhythm indices in the range of 30–100 Hz, in comparison with the control group. Statistically significant correlations were established between cognitive, anxiety-depressive disorders and the gamma rhythm index in the frontal and central-temporal areas in the frequency range of 30–100 Hz. Conclusion . Mathematical analysis of BEA of the brain along with clinical and neuropsychological studies is recommended for use in identifying cognitive and emotional (anxiety-depressive) disorders in patients with HIS in the in the acute and subacute periods.