Probing the neuronal status for cerebrovascular disease using EEG

Cerebrovascular disease (CVD) such as stroke is the leading cause of long-term disability and the third most common reason of death in the world. In this work, an indication for the assessment of neuronal activity and the degree of severity of stroke patient has been studied using electroencephalogram (EEG). A parallel study has also been carried out on healthy volunteers of under fifteen years to find the comparison of neural activity between different age groups. In order to assess the brain pathophysiology in supratentorial brain lesion patients the quantitative EEG parameters such as delta/alpha ratio (DAR) and delta-plus-theta to alpha-plus-beta ratio (DTABR) have been used. It is observed that the DAR and DTABR values of the left cerebral hemisphere of the patient are much higher than the right cerebral hemisphere. It is also higher in both cerebral hemispheres than the control. A threshold value of ~3.7 for DAR and ~3.5 for DTABR has been obtained. It is found that delta and DAR indices of the old age are twice than the child, indicating the diminishing of neuronal activity of old age is half of the child. These results could be important for stroke diagnosis, prognosis, re-habitation strategies, and proper neurological treatment.