Ventilatory and hemodynamic variables.

Values are mean ± SD from initial 5 minutes of ventilation. PEEP values are given as range (minimum and maximum). Definition of abbreviations: VCV_E = volume-controlled mode and PEEPminErs; VCV_E+2 = volume-controlled mode and PEEPminErs plus 2 cmH2O; VCV_E-2 = volume-controlled mode and PEEPminErs minus 2 cmH2O; VV_E = variable ventilation and PEEPminErs; VV_E+2 = variable ventilation and PEEPminErs plus 2 cmH2O; VV_E-2 = variable ventilation and PEEPminErs minus 2 cmH2O; BW = body weight; Ppeak = peak airway pressure; Pmean = mean airway pressure; PEEP = positive end-expiratory pressure; VT = tidal volume; RR = respiratory rate; CVVT = tidal volume coefficient of variation; MAP = mean arterial pressure; HR = heart rate. Differences among groups were tested with two-way ANOVA. Statistical significance was accepted at pVentilatory and hemodynamic variables.