Relationship between Depth of Anesthesia and Interleukin-6 with the Incidence of Postoperative Delirium (POD) in Geriatric Patients Undergoing General Anesthesia

Abstract

Background: The incidence of postoperative delirium (POD) in geriatric patients is aged 3-61%. The combined effects of inflammatory factors and depth of anesthesia can affect neurotransmitters and receptors in the central nervous system that affect POD. To analyze the relationship between depth of anesthesia and IL-6 with the incidence of POD in geriatric patients undergoing general anesthesia. Methods: A prospective cohort study was conducted in geriatric patients undergoing general anesthesia. Patients were divided into two groups based on the bispectral index (BIS): BIS 40-45 and BIS 51-60. POD was measured using the Confusion Assessment Method (CAM) and Mini-Mental State Exam (MMSE) 24 hours postoperatively. Serum IL-6 measurements were also performed before and 24 hours postoperatively. Results: A total of 22 patients were collected with the results that the MMSE score decreased insignificantly at 24 hours postoperatively, and there was no difference in MMSE scores based on BIS (p > 0.05). The depth of anesthesia was significantly associated with CAM (p < 0.05). Delirium incidence was more frequent in BIS 40-45. IL-6 levels increased significantly at 24 hours postoperatively (p < 0.05). IL-6 levels were not significantly associated with MMSE and CAM scores (p > 0.05). Conclusion: BIS 40-45 has the potential to be a predictor of POD in geriatric patients with general anesthesia.

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