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The main objective of this study is to investigate the optimal anesthesia for obese patients undergoing bariatric surgery in the strategies of positive pulmonary ventilation, tracheal intubation technique, hemodynamic monitoring, and postoperative nausea and vomiting (PONV) prophylaxis, as the followed: 1. To evaluate the effectiveness and adverse effect of intravenous dexamethasone for PONV prophylaxis 2. To determine the safe inspiratory pressure to prevent the occurrence of gastric insufflation during facemask ventilation using point-of-care ultrasonography of antrum 3. To compare the effectiveness and safety between video intubating stylet and video laryngoscope in the placement of tracheal tubes 4. To apply minimally invasive CO monitors in guiding goal-directed hemodynamic therapy and assess its impact on major complications and postoperative recovery
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Substudy 1: Number of participants developing postoperative nausea and vomiting
Timeframe: The first 24 postoperative hour
Substudy 2: The threshold inspiratory pressure for gastric insufflation
Timeframe: Within 2 min after induction of anesthesia
Substudy 3: The best glottis visualization, graded according to Cormack and Lehane's classification
Timeframe: From the induction of anesthesia to the 24th postoperative hours
Substudy 4: Number of participants developing postoperative major complications
Timeframe: Within 30 days after surgery