ANESTHESIA MONITORING SYSTEM BASED ON ELECTROENCEPHALOGRAPHIC SIGNALS

摘要

A system which classifies patients according the their level of awareness orconsciousness using measures derived solely from electroencephalograph (EEG)signals. Thesystem comprises multiple observers of characteristics of signals, includingartifact detectors,especially magnitude artifact detectors, eye blink detectors, stationarity/RMSdetectors, slewrate detectors, and burst suppression detectors, and determination of power incertainfrequency bands. The system produces a signal derived probabilistic measure ofconsciousawareness called the patient state index (PSI) and displays values of trendsin that index andvalues of an artifact index, and EMG index, and a suppression ratio in orderto give theoperator current information on the quality of the signal input. The PSI isderived from astatistical analysis using empirically derived population norms and otherparameters.