Table 1. Hemodynamic Variables throughout the Experimental Procedure

*P < 0.005 compared with previous value.

†P < 0.005 compared with baseline.

‡P < 0.005 compared with ZEEP.

§P < 0.005 compared with ZEEP + volume.

#P < 0.005 compared with PEEP.

ZEEP = zero end-expiratory pressure; PEEP = positive end-expiratory pressure.