OLV will be initiated using a VT of 6 mL/kg PBW, FiO2 of 0.3-1.0 to maintain SaO2 > 92%, whereas the I: E ratio, PEEP, respiratory rate, and FGF will be maintained as during two-lung ventilation. Recruitment maneuvers for the dependent lung will be repeated at 30-minute intervals by raising the inspiratory pressure up to 40 cmH2O for 10 seconds.