Introduction
neurocognitive disorders, rEEG-based intraoperative visual
Intraoperative neuromonitoring allows monitoring of the changes in brain electrical activity during the changing states of consciousness under general anesthesia and offers information on anesthesia depth. EEG monitoring can help anesthesiologists to avoid the use of unnecessary high anesthetics doses, which is able to be a risk factor for occurring peri-operative neurocognitive disorders [The raw electroencephalogram (rEEG) correlates significantly with the level of consciousness in patients under general anesthesia [Given that the pEEG method of monitoring depth of sedation has been widely used in clinical practice, and that the limitations of the pEEG itself and the neurological changes in elderly patients lead to limitations in the accuracy of pEEG-guided anesthesia in elderly patients, the aim of this study was to investigate whether rEEG-based intraoperative visual analysis of EEG-guided anesthetic depth management could have an impact on intraoperative anesthetic management and EEG patterns and affect postoperative outcomes in elderly patients undergoing major abdominal surgery compared with routine anesthetic care monitoring, and to provide a reference for the clinical application of rEEG in elderly patients.
Six levels of anesthesia