Effect of Intraoperative Dynamic Compliance Guided Individualized Positive End-expiratory Pressure on Postoperative Atelectasis After Laparoscopic Bariatric Surgery

Effect of Intraoperative Dynamic Compliance Guided Individualized Positive End-expiratory Pressure on Postoperative Atelectasis After Laparoscopic Bariatric Surgery: a Single-center, Double-blind Randomized Controlled Trial

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.

Inclusion Criteria:

1. Bmi ≥ 35 kg/ m2
2. over 18 years old
3. elective laparoscopic bariatric surgery (gastric bypass or sleeve)

Exclusion Criteria:

1. ASA >IV
2. Lung bullae
3. thoracic surgery history
4. quit smoking less than 1 week
5. chronic obstructive pulmonary disease requiring oxygen
6. congestive heart failure (New York Heart Association classification ≥ III)
7. planned to be transferred to intensive care unit after surgery
8. Patients participating in another interventional study
9. Refuse to sign the informed consent