[Comparative assessment of electroencephalographic readings and perfusion index in patients in the perioperative period and coma].

Different monitoring modes are used to estimate the depth of anesthesia. Electroencephalography (EEG) is employed as a method of an electrophysiological study of brain function both during anesthesia and at the neuroresuscitative stage and changes in the peripheral vascular bed are evaluated by means of the perfusion index (PI). The purpose of the study was to comparatively analyze the use of EEG readings and PI at different stages of surgery and in coma of various etiologies. Thirty female patients aged 30-70 years (Group 1) operated on under general anesthesia were examined. Group 2 consisted of 14 intensive care unit patients of both sexes and different ages (range, 3 to 60 years) who had depressed consciousness to the comatose level. The association established between the changes in EEG reading and PI in the perioperative period allows estimation of the depth and adequacy of anesthesia, by analyzing the changes in both EEG and PI. Unlike central hemodynamic parameters, PI shows an earlier response to nociception. Group 2 patients had also synchronous changes in EEG and PI characteristics in various clinical conditions.