Table 5.

Postoperative data of the patients

Blood gas-derived variables	CFT group (N = 34)	USP group (N = 32)	p-value
P/F ratio, mmHg, median	392.5 (340 to 460)	393.2 (305 to 508)	0.9619
Lactate, mmol/l, median	1 (0.8 to 1.2)	0.85 (0.6 to 1.35)	0.3545
Base excess, mmol/l	− 4.75 ± 2.54	− 5.24 ± 2.0	0.3824
Lung ultrasound on postoperative day 1	CFT group (N = 38)	USP group (N = 38)
LUS, median	4 (3 to 7)	4 (3 to 8)	0.8823

CFT conventional fluid therapy, LUS lung ultrasound score, P/F ratio PaO₂/FiO₂, USP ultrasound-based protocol