Figure 3.

Change in the PF ratio and serum LDH level during total knee arthroplasty: (A) PF ratio and (B) LDH. Abbreviations: PF ratio, the ratio of the arterial oxygen partial pressure to the fractional inspired oxygen; LDH, lactate dehydrogenase; Preop, before anaesthesia induction; Pre TQ, just before the application of the tourniquet for the operation site; End TQ, just before the release of the tourniquet for the operation site; TQ release, just after the release of the tourniquet for the operation site; Post 1 h, postoperative 1 h; Post 24 h, postoperative 24 h. * Adjusted by Bonferroni's correction.