Delirium
Description
The prediction of postoperative delirium of patients with the Bispectral index in elderly patients：A cohort study
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Data collection For patient evaluation, a preoperative questionnaire was asked that included the patients’age, gender, body mass index(BMI),Charlson Comorbidity Index(CCI), activity of daily living (ADL), Richards-Campbell sleep questionnaire (RCSQ)[10], mini-mental state examination(MMSE) [11]and geriatric depression scale(GDS-15)[12]. Furthermore, BIS, CAM or CAM-ICU and the RASS score were noted. Additionally, the time of surgery, and intraoperative medication were recorded. Peri operative blood tests including biochemical tests, blood routine examination, etc. Delirium assessments Delirium was diagnosed by two independent researchers trained in delirium assessment. When researchers were uncertain regarding the evaluation of delirium, the delirium assessment was referred to an neurologist for adjudication. Patients were assessed daily at 7-9 PM on postoperative days 1 through 5,unless patients were discharged or sedated (Richmond Agitation and Sedation Scale score <-3). Family members were asked whether the patient had abnormal performance during the day, and patients with suspicious delirium were followed up during the day. CAM scale was used for patients in general wards and CAM-ICU scale for patients with intubation in ICU. Bilateral bispectral index After the CAM assessment, BIS monitoring was performed using the BIS VISTA (program version 3.22) monitoring system and BIS monitoring electrodes (ASPECT Medical Systems, Norwood, MA, USA). Ask the patient to lie down and close the eyes, keep the environment quiet, and clean the forehead and bilateral temporal skin with gauze and alcohol. Place the electrode in accordance with the instructions and apply to the skin. The researchers record BIS number 5 min continuously with SQI≥65 and EMG < 50.