Secondary outcomes
atelectasis
ATELECTASIS

There were no significant differences in the percentages of over-aeration, normal-aeration, or poor-aeration volumes between the two groups. The overall incidence of clinically significant atelectasis was 83.2%, but again, there was no significant intergroup difference. Additionally, after adjusting for blood gas indicators before anesthesia, the oxygenation index at the end of surgery in the 30% FiO
Secondary outcomesValues are presented as mean ± SD, median (IQR), or n (%). 