Respiratory and hemodynamic variables during the five periods of the study for the three groups.

Data are expressed as mean ± SD.Abbreviations: CMV: controlled mechanical ventilation; SB: spontaneous brpoeathing; PSV: Pressure Support Ventilation; RR: respiratory rate; VTexp: expiratory tidal volume; Ti/Ttot: duty cycle; P0.1: occlusion pressure at 100 ms; SpO2: oxygen saturation.MAP: mean arterial pressure.*P#P§P£comparison to T0 (i.e, T1 vs T0; T2 vs T0; T3 vs T0).Respiratory and hemodynamic variables during the five periods of the study for the three groups.