SURVIVAL ANALYSIS AND SPATIAL-FREQUENCY DISTRIBUTION OF EEG-INDICES IN RATS’ GLOBAL CEREBRAL ISCHEMIA

Research goal was an evaluation of survival and electroencephalographic (EEG) indices in rats with experimental cerebral ischaemia (ECI) during the preventive application of cerebroprotective drugs: nootropics (piracetam (300 mg/ kg/day) and vinpocetine (5 mg/kg/day)) in combination with melaxen (0,25 mg/kg/day). Global CI was modelled by left and right common carotid arteries (CCA) ligation. It was founded that preventive combined application of vinpocetine and melaxen reduced significantly (about 2.5 times (р≤0,01)) rats lethality and influence of circulatory ischemia adverse effects on survived experimental animals brain functional state. Only in the rats receiving these drugs were registered frequency ranges close to the baseline, specifically, theta (θ)-rhythm was dominated over delta (Δ)-activity, indicating waking state of the rats’ brain. The results obtained can be used in clinical practice for prevention and treatment of ischemic brain diseases.