 In the post operative phase the total intravenous fluid requirement, blood transfusion, pain scores, amount of Morphine used, whether the patient vomited and whether nasogastric tube is required as well as lung function tests and any adverse events are noted at 30 minutes following the procedure, 6 hours, 24 hours, 48 hours, 72 hours, 96 hours, 120 hours, 144 hours, 168 hours and continued daily until the patient is discharged if not already discharged at that time. At discharge from hospital, total hospital days are identified as well as time in high dependency unit or intensive care unit, reason for delay in discharge is noted, post operative events including cardiac, respiratory, renal, ileus, wound infection, anastomotic leakage and other events are identified. 