This is a prospective, single-center, double-blind, randomized controlled trial designed to investigate the individual differences in recruitment efficacy and safety between personalized lung recruitment pressure based on esophageal pressure and conventional fixed lung recruitment pressure. The intervention involved calculating personalized lung recruitment pressure using inspiratory and expiratory esophageal pressures measured via a transnasal esophageal balloon catheter, which was then compared with a fixed pressure of 30 cmHâ‚‚O, each applied to maintain a single-cycle lung recruitment maneuver for 10 seconds. A total of 90 patients undergoing elective tracheal intubation under general anesthesia for head-down laparoscopic surgery were randomly assigned to either the experimental or control group. The primary outcome was post-recruitment lung compliance, and secondary outcomes included driving pressure, peak airway pressure (Ppeak), modified LUS score, gas exchange indices, hemodynamic parameters, length of stay in PACU after extubation, incidence of postoperative pulmonary complications (PPCs) on day 3 after surgery, and the rate of non-surgical antibiotic use.
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Lung Compliance
Timeframe: From the establishment of pneumoperitoneum until the end of surgery.