Lung ultrasound score to determine the effect of fraction inspired oxygen during alveolar recruitment on absorption atelectasis in laparoscopic surgery: A randomized controlled trial

Although the intraoperative alveolar recruitment maneuver (RM) efficiently treats atelectasis, the effect of FIO2 on atelectasis during RM is uncertain. We hypothesized that a high FIO2 (1.0) during RM would lead to a higher degree of postoperative atelectasis without benefiting oxygenation when compared to low FIO2 (0.4).