Table 3.

Blood gas analysis during the study period

Variable	TLV, after induction		OLV, prior to intervention		OLV, after intervention		TLV, End of surgery
	PEEPINCREMENTAL	PEEPDECREMENTAL	PEEPINCREMENTAL	PEEPDECREMENTAL	PEEPINCREMENTAL	PEEPDECREMENTAL	PEEPINCREMENTAL	PEEPDECREMENTAL
PaO2/FIO2 ratio (mmHg)	350 [238–438]	298 [219–447]	139 [103–202]	140 [99–176]	153 [103–192]	186 [152–243] #*	423 [241–492]	402 [262–463]
FIO2	50 [40–55]	40 [40–50]	58 [49–66]	55 [49–60]	65 [56–73]*	50 [40–52]#*	57 [50–65]	50 [44–60]
PaCO2 (mmHg)	47 [42–51]	38 [42–52]	55 [50–59]	53 [49–60]	59 [54–62]	54 [51–64]	49 [45–52]	50 [43–53]
pH	7.36 ± 0.05	7.36 ± 0.05	7.31 ± 0.05	7.31 ± 0.07	7.27 ± 0.05*	7.28 ± 0.06*	7.31 ± 0.04	7.31 ± 0.06
HCO3−	26.9 ± 2.6	26.5 ± 2.5	27.0 ± 1.8	26.7 ± 2.3	26.4 ± 1.7	26.3 ± 2.5	24.7 ± 1.9	24.4 ± 2.3
Lactate (mmol/L)	1 [0.7–1.2]	0.8 [0.7–1.2]	0.8 [0.7–1.2]	0.8 [0.7–1.1]	0.8 [0.6–1]	0.8 [0.7–1.1]	0.9 [0.7–1.0]	0.8 [0.7–1.0]
Hb (g/dL)	12.6 ± 1.8	12.4 ± 1.6	12.1 ± 1.6	12.0 ± 1.6	12.1 ± 1.7	11.9 ± 1.6	12.0 ± 1.9	11.5 ± 1.7

Pa_CO2 arterial partial pressure of carbon dioxide, Pa_O2 arterial partial pressure of oxygen, F_IO₂ fraction of inspired oxygen, Hb hemoglobin

^#p < 0.05 vs the other group, *p < 0.05 vs prior to intervention