Anesthesia monitoring system based on electroencephalographic signals

摘要

A system which classifies patients according to their level of awareness or consciousness using measures derived solely from electroencephalograph (EEG) signals. The system comprises multiple observers (3) of characteristics of signals, including artificial detectors, especially magnitude artifact detectors (103), eye blink detectors (104,105), stationary/RMS detectors (107), slew rate detectors (108), and burst suppression detectors (109), and determination of power in certain frequency bands. The system produces a signal derived probabilistic measure of conscious awareness called the patient state index (PSI) and displays values of trends in that index and values of an artifact index, and EMG index, and a suppression ratio in order to give the operator current information on the quality of the signal input. The PSI is derived from a statistical analysis using empirically derived population norms and other parameters. IMAGE