Table 3. Respiratory Workloads at Each Ventilatory Setting

After extubation, volume was measured by respiratory inductive plethysmography.

*P < 0.05 versus  SIMV 20.

†P < 0.05 versus  SIMV 15.

‡P < 0.05 versus  SIMV 10.

§P < 0.05 versus  SIMV 5.

∥P < 0.05 versus  SIMV 0.

SIMV = synchronized intermittent mandatory ventilation; WOB = work of breathing; SB = spontaneous breath; ND = not detected; PTP = pressure–time product; PTPb = pressure–time product per breath; ΔPes = negative deflection of esophageal pressure; MCA/V^T= maximum compartment amplitude/tidal volume.