A, volumetric flow significantly decreased after LPS application despite of volume resuscitation to maintain MAP. After starting i.v. application of PD-4-I (arrow) microcirculation improved compared to LPS alone. B, all animals received a fixed volume application (control) and additional i.v. boli to maintain MAP > 60 mmHg if needed. Significant less volume was applied in PD-4-I-treated animals compared to LPS alone. C and D, CI (C) and MAP (D) showed no significant changes between LPS and LPS+PD-4-I groups. *P < 0.05 vs. control, #P < 0.05 vs. LPS and LPS+PD-4-I, †P < 0.05 vs. PD-4-I.