Background
POSTOPERATIVE ATELECTASIS

Postoperative atelectasis diagnosed by CT occurs in 60–90% of patients with mechanical ventilation under general anesthesia [
Mechanical ventilation provides the necessary oxygen supply for patients under general anesthesia during surgery, however, the optimal inspired oxygen fraction (FiO
Previous studies have provided conflicting results; thus the effect of FiO
Therefore, we conducted a randomised controlled study to investigate the effects of 30% versus 60% FiO