Comparison of low and high inspiratory oxygen fraction added to lung-protective ventilation on postoperative pulmonary complications after abdominal surgery: A randomized controlled trial.

•The issue of inspiratory oxygen fraction was controversial in the ventilation management.•Hyperoxemia following liberal oxygen management are pervasive intraoperatively.•Concerns of potential detrimental effect of high oxygen fraction were raised.•30% oxygen might have a beneficial effect with less severe pulmonary complications.