الفهرس 
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Abstract
Hypoxemia is a common and potentially serious postoperative complication. The respiratory depressant effect of anesthesia plays a significant role, in the incidence of postoperative hypoxemia. Obesity is a particular dangerous factor for hypoxemia in the postoperative period especially if associated with chest problems. This study was conducted in Mansoura University Hospital on 30 patients who were scheduled for elective abdominal operations. The patients of the present study were divided into two groups: • Propofol group: 15 obese patients. • Halothane group: 15 obese patients. Patients of each main group received a different anesthetic technique. In proparol group, total intravenous (TIVA) using propofol, while halothane group received inhalation anesthesia using halothane. We have compared the effects of two methods of anesthesia in two groups in relation to hypoxemia at three times: (a) preoperative, (b) intraoperative, (c) early postoperative period. We have used measurement of arterial oxygen saturation (SPO2) by using pulse oximeter and arterial blood gases (ABGs) analysis at supine position. In addition to monitoring of heart rate, blood pressure and end tidal CO2. This study has showed a significant decrease in intraoperative oxygen saturation in halothane group in comparison with propofol group. Moreover, there was a significant decrease in oxygen saturation and arterial oxygen tension in halothane group In comparison to porpofol group in postoperative period.