Fig. 4

Meta-analysis comparing the effects of remote ischaemic preconditioning (RIPC) versus control on the ratio of arterial oxygen partial pressure to fractional inspired oxygen (PaO2/FiO2) within 6 h postoperatively (A), the arterial to alveolar partial pressure of oxygen (PaO2/PAO2) (B), and the alveolar-arterial partial pressure of oxygen difference (PAO2-PaO2) (C) in patients undergoing non-cardiac non-vascular surgery