IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-11-1-39639 Original Research Paper STUDY OF THE EFFECT OF MONITORING INTRAOPERATIVE REGIONAL CEREBRAL OXYGEN SATURATION ON POSTOPERATIVE COGNITION IN ELDERLY PATIENTS UNDERGOING MAJOR ABDOMINAL SURGERY Janaki Janka Dr. January 2022 11 1 01 02