This study intends to explore the effect of dynamic compliance guided individualized positive end-expiratory pressure titration strategy on reducing the level of postoperative atelectasis in obese patient who have laparoscopic bariatric surgery.The results of the study are to assess the effects of this intervention on the incidence，duration of postoperative atelectasis and other complications including hypoxemia etc. after laparoscopic bariatric surgery.And reducing the burden of postoperative atelectasis on patients and their families, hospitals and public resources.
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Percentage of postoperative atelectasis
Timeframe: 60-90 minutes after extubation