Figure 2From: Using bispectral index and cerebral oximetry to guide hemodynamic therapy in high-risk surgical patientsBIS values obtained for a series of 90 high-risk patients undergoing major vascular surgery using total intravenous anesthesia with propofol and remifentanil. The average BIS was 45 and only 6 patients had BIS maintained below the normal lower range of 40. BIS: bispectral index.Back to article page