Incidence of postoperative pulmonary congestion and acute kidney injury in patients undergoing long duration surgeries and its correlation with intraoperative standard fluid therapy: a prospective observational study.

This study will be a prospective, single center, observational study to be carried out for a period of one year. Patients of the age group of 18 to 65 years, ASA I and II, undergoing long duration surgery of more than 3 hours will be included in the study. Patients with cardiovascular ailments, morbid obesity, pregnancy, undergoing  cardiothoracic and urologic surgery will be excluded from the study. Lung ultrasound will be performed preoperatively and 1 hour postoperatively by the the same experienced investigator to avoid inter variability. The renal function test will be performed preoperatively and 5 days post operatively. The primary outcome is to calculate  the incidence of postoperative pulmonary congestion and acute kidney injury. The secondary outcome is to see the correlation of total  intravenous fluids, blood and blood products administered intraoperatively with postoperative pulmonary congestion and acute kidney injury.