Clinical Study of Lung Protective Ventilation Strategies and Tumor Microenvironment

They were divided into 2 groups: traditional ventilation strategy group (control group) and lung protective ventilation strategy group (experimental group), with 30 cases in each group. In the conventional ventilation strategy group, the conventional ventilation strategies were followed: tidal volume （VT）=10-12ml/kg, respiratory rate（f） =12 times/minute, PEEP=0 cmH₂O, fraction of inspired oxygen=0.5; Lung protective ventilation strategies were implemented in the Lung protective ventilation strategy group: VT=6-8ml/kg, f=12 times/min, PEEP=6-8 cm H₂O,fraction of inspired oxygen=0.5 Manual lung reexpansion was performed every 30 minutes after mechanical ventilation (continuous positive airway pressure of 30 cm H₂O for 30 seconds).