Patients are admitted to the preoperative unit 30 minutes before the operation. All patients are monitored with non-invasive blood pressure (NIBP), electrocardiogram (ECG), end-tidal carbon dioxide (ETCO2) and peripheral oxygen saturation (SpO2) in the operating room before the start of anesthesia induction. Anesthesia is induced with 4-5 % sevoflurane and a cannula (18 gauges) is placed intravenously after ensuring adequate depth of anesthesia and thus 0.9% of saline infusion is started at a 10 mL kg-1 hr-1 rate for hydration. Patients are received dexamethasone via intravenous (iv) route of 0.5 mg.kg-1 (maximum dose of 15 mg) and an equal volume of saline iv, in group D and group S, respectively.