Elective Major Abdominal Surgery

This study aims to compare two different methods for guiding intravenous (IV) fluid therapy in patients during their first 6 hours in the ICU after major abdominal surgery. The goal is to determine which method leads to a more optimal and precise amount of fluid administration. The objective is to compare the total fluid volumes administered when guided by Cardiac Index versus Central Venous Pressure, as well as mortality, length of stay, relaparotomy and reintubation in order to identify the more precise fluid management strategy for postoperative ICU patients.

Predisposing and precipitating factors for perioperative delirium for the elderly remain elusive. This research will be conducted to determine risk factors of postoperative delirium.