compare the effectiveness of different doses of dexamethasone used for postoperative nausea and vomiting prophylaxis in obese patients.~compare the effectiveness of dexamethasone given in 4 mg and 8 mg doses in obese patients with 4 mg doses of dexamethasone in normal weight patients.~4 mg iv dexamethasone will be administered to normal weight patients at induction of anesthesia. This group will be classified as the control group. In obese patients (BMI>30 kg/m2), one group will receive 4 mg dexamethasone and other group will receive 8 mg dexamethasone at induction.~Patients will receive general anesthesia with volatile anesthetics and tramadol will be administered IV at the end of surgery.~Postoperative nausea and vomiting, postoperative pain, blood glucose, wound infection, time to oral intake, hospital stay will be compared.
compare the effectiveness of different doses of dexamethasone used for postoperative nausea and vomiting prophylaxis in obese patients and in normal weight patients.