A Randomized Self-Crossover Trial on Hemodynamic Effects of Left Versus Right Unilateral Lung Recruitment Maneuver During One-Lung Ventilation

INTERVENTION: Group L:Left lung recruitment was performed first, followed by right lung recruitment.;Group R:Right lung recruitment was performed first, followed by left lung recruitment.; CONDITION: Hypotension PRIMARY OUTCOME: The maximum percentage decrease in mean arterial pressure (?MAP%); SECONDARY OUTCOME: Percentage change in heart rate (?HR%);Percentage change in pulse oximetry (SpO2) (?SpO2%); INCLUSION CRITERIA: 1. Aged 18‐75 years; 2. ASA Physical Status Classification I–III; 3. Provide written informed consent.