Table 5: Arterial blood gases and airway pressures in both groups.

VariableGroup I (Propofol) No. = 25Group II (Isoflurane) No. = 25
During TLVDuring OLVAfter OLVDuring TLVDuring OLVAfter OLV

PaO2 (mmHg)268 (88)115 (54)284 (87)265 (86)111 (51)278 (88)
PaCO2 (mmHg)35.6 (3.9)36.2 (4.2)35.5 (4.0)36.4 (3.8)36.9 (3.9)36.1 (4.0)
pH7.41 (0.04)7.40 (0.04)7.41 (0.04)7.40 (0.04)7.40 (0.05)7.40 (0.04)
SaO2 (%)99.1 (1.3)96.2 (2.5)99.3 (1.2)99.0 (1.1)95.7 (2.2)98.7 (1.5)
Ppeak (cm H2O)17.6 (5.1)24.4 (5.3)17.2 (3.9)18.2 (5.4)25.2 (4,9)17.6 (4.1)
Pmean (cm H2O)6.1 (2.0)8.9 (2.2)6.0 (1.2)6.4 (1.8)9.2 (2.1)6.3 (1.3)
Pplateau (cm H2O)13.8 (2.9)17.1 (3.9)13.6 (2.2)14.0 (2.7)17.5 (3.8)13.9 (2.4)

TLV: two-lung ventilation; OLV: one-lung ventilation; PaO2: arterial oxygen tension; PaCO2: arterial carbon dioxide tension; SaO2: arterial oxygen saturation; Ppeak: peak inspiratory pressure; Pmean: mean inspiratory pressure; Pplateau: plateau inspiratory pressure. Data are expressed as mean (SD). 𝑃 > 0 . 0 5 denotes statistical insignificance.