Susano MJ, Scheetz SD, Grasfield RH, et al. - By retrospectively examining data from patients aged 65 years and above who underwent spine surgery between July 1, 2015 and March 15, 2017, researchers investigated perioperative variables that could predict the development of postoperative delirium in this patient population. They used univariate and multivariable analysis to analyze preoperative, intraoperative, and postoperative data for 716 patients, among whom, postoperative delirium development was detected in 127 (18%). In multivariable analysis, older age, American Society of Anesthesiologists physical status > 2, metabolic equivalents of task < 4, depression, nonelective surgery, invasive surgical procedures and higher mean pain scores on postoperative day 1 were all identified as independent predictors of delirium after surgery. Among participants, postoperative delirium commonly occurred as a complication.