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

<p>Data are expressed as mean ± SD.</p><p><b><i>Abbreviations:</i></b> 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.</p><p>MAP: mean arterial pressure.</p><p>^*<i>P</i><0.05 CMV vs PSV.</p>#<p><i>P</i><0.05 CMV vs SB.</p>§<p><i>P</i><0.05 SB vs PSV.</p>£<p>comparison to T0 (i.e, T1 vs T0; T2 vs T0; T3 vs T0).</p><p>Respiratory and hemodynamic variables during the five periods of the study for the three groups.