| Outcome Measures: |
Primary: Blood glucose levels in milligrams per decilitre (mg/dl) at different time points, Blood glucose levels in milligrams per deciliter at different time points: preoperative (T0), post-intubation (T1), 1st , 2nd and 3rd hour after the start of the operation (T3, T4 and T5, respectively), 1st hour after the operation (T6) , 2nd hour after the operation (T7), 1st and 2nd day after the operation (T8, T9), Immediate preoperative till 48 hours after recovery from anesthesia | Secondary: Serum insulin level in picomoles per litre (pmol/l), serum insulin level (pmol/l) 30 min before and 30 min after surgery, 30 min before induction of anesthesia and 30 min after surgery and recovery from anesthesia|Serum cortisol level in micrograms per decilitre (mcg/dl), serum cortisol level (mcg/dl) 30 min before and 30 min after surgery, 30 min before induction of anesthesia and 30 min after surgery and recovery from anesthesia|The incidence of postoperative complications, The complications that will be tested Acute coronary syndrome. Stroke. acute kidney injury. stress gastric ulcer. surgical site infection. Hypoglycaemia (blood glucose level below 70 mg/dL). Hyperglycemia (fasting blood glucose level greater than 125mg/dL while 2 hours postprandial greater than 200 mg/dL). Postoperative nausea and vomiting . postoperative pulmonary complications including atelectasis, pneumonia and respiratory failure, The complications will be assessed on the first, third and seveth post-operative day
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