Patient and anesthetic characteristics.

Data are expressed as mean ± SDNo significant difference was observed between the three groups for patient characteristics and general anesthesia duration.Abbreviations: CMV: controlled mechanical ventilation; SB: spontaneous breathing; PSV: Pressure Support Ventilation.Patient and anesthetic characteristics.数据以平均值±标准差（mean ± SD）表示。三组患者的基线特征与全身麻醉时长均未观察到显著差异。缩写注释：CMV（控制机械通气，controlled mechanical ventilation）；SB（自主呼吸，spontaneous breathing）；PSV（压力支持通气，Pressure Support Ventilation）。患者与麻醉特征。