Table 2. Comparison of the intraoperative blood gas analysis and perioperative surgical parameters between the two-intubation approaches.

Intra-operative blood gas analysis	OLV	TLV	P value
Pre-PCO2	39.25 (4.6)	37.50 (5.2)	0.371
1 hr PCO2	48.20±7.83	47.44±7.71	0.662
2 hr PCO2	43.99±6.96	43.57±6.60	0.756
Pre-PO2	74.65 (10.5)	75.50 (11.4)	0.209
1 hr PO2	124.45 (106)	207.10 (283.0)	0.002
2 hr PO2	296.90 (290.7)	382.20 (205.7)	0.035
Pre-SO2	96.50 (2.0)	96.30 (2.0)	0.376
1 hr SO2	99.00 (3.0)	100.00 (1.0)	0.001
2 hr SO2	100.00 (0.0)	100.00 (0.0)	0.086

Data shown as mean ± SD or numeric value. OLV, one-lung ventilation; TLV, two-lung ventilation.