1. Introduction
cognitive impairment
As an electroencephalographic (EEG) modality, burst suppression consists of alternating periods of high-amplitude slow waves (bursts) and so-called flat EEG (suppression) periods.A lower percentage of operative time spent with EEG suppression was related to processing the EEG to maintain a Patient State Index > 35, and a higher percentage of operative time was related to preoperative cognitive impairment.The aim of this study was to determine the effect of burst suppression on cerebral oxygen metabolism and postoperative cognitive function in elderly surgical patients to evaluate the cerebral protective effect.