MONITORING OF BRAIN ACTIVITIES IN ANESTHETIZED AND CRITICAL PATIENTS / 解放军医学杂志

ABSTRACT

This paper reported the characteristics and regular patterns of the changes in computerized quantitative electrocncephalogram(EEGcq) and frontal electromyogram(EMGf) in 331 patients under the effect of various inhaled and intravenous anesthetics, and the changes in the EEGcq and EMGf during cerebral ischemia caused by serious hypotention or arrhythmia, feeble heartbeat, cardiac electromechanical dissociation and hypoperfusion during extracorporeal circulation. It was found that the amplitude of EEGcq decreased with a"suddenly coming and departing appearance"when the anesthesia with isofl-uorane was excessively deepened or the course of becoming light, that the EEGcq amplitude displayed on the screen showed frequent sharp uprisings when the anesthesia with enfluorane was excessively deepened, that the response of EMGf to various hurtful stimuli presented spikes when anesthesia was inadequate, and that the EMGf showed plateau tracings when the anesthesia was very light.