Electrooptical Diagnostic Method of Blood Supply Disorders in the Human Brain

The article describes stages in the development of an electrooptical method for diagnosing blood supply disorders in the human brain. The proposed method is based on the comparison and identification of the correspondence of cardiac cycle durations recorded by electrocardiography and photoplethysmography. Electrocardiography was used to record the cardiac cycle as the duration of cardiointervals, which reflect mainly intracardial regulatory mechanisms. Photoplethysmography was used to record the cardiac cycle as the duration of pulse waves, which reflect extracardial regulative mechanisms of the cardiovascular system. Initially, the duration of cardiointervals and pulse waves were recorded and compared in healthy volunteers. The most pronounced coincidence was observed when recording a photoplethysmogram from an ear sensor. Further, the obtained data was compared with that recorded in pathological conditions accompanied by impaired blood supply to the brain, including vertebral artery syndrome in cervical spine osteochondrosis and autonomic dysfunction syndrome. A decrease in the degree of correspondence between the durations of cardiac intervals and pulse waves was found in volunteers with the considered pathologies compared to the norm. Subsequently, based on the duration of cardiac intervals and pulse waves, the volunteers were divided into three groups: the norm group and two groups of the considered pathologies. Finally, based on the results of a discriminant analysis, a set of indicators was identified, allowing the three groups to be differentiated.

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