Obesity, Morbid Clinical Trial
Official title:
Effects of Individualized Positive End-expiratory Pressure Guided by Driving Pressure on Postoperative Atelectasis After Bariatric Surgery in Patients With Morbid Obesity: A Single-center, Prospective, Randomized Controlled Study
Atelectasis is a common complication in patients undergoing surgery under general anesthesia, particularly in obese patients. Postoperative atelectasis could last for more than 24h and contribute to a variety of other complications, including hypoxemia and pneumonia. We plan to conduct a single-center, randomized controlled trial in patients undergoing bariatric surgery to test the hypothesis that driving pressure guided PEEP could reduce the postoperative atelectasis.
Positive end-expiratory pressure (PEEP) is a strategy that helps to keep alveoli open during surgery and to prevent postoperative atelectasis. A fixed PEEP without considering the respiratory mechanics in individual patients, however, is not optimal. Individualized PEEP therefore has been increasingly studied, and has been shown to improve oxygenation in both nonobese and obese patients. Studies have shown that the occurrence and prognosis of PPCs are significantly associated with high driving pressure (DP), but not with VT and PEEP. Driving pressure-guided individualized PEEP is expected to be a novel perioperative lung protection strategy. Consequently, the main aim of this study is to investigate the effect of a driving pressure-guided individualized PEEP ventilation strategy on postoperative pulmonary atelectasis in morbidly obese patients undergoing bariatric surgery. ;
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