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Figure 2 Mean observed hemodynamic values: results from baseline (BL) through 24 h of infusion (inf) and 4 h postinfusion. (A) Pulmonary capillary wedge pressure units are mm Hg. (B) Cardiac index units are liters/min/m². (C) Systemic systolic blood pressure units are mm Hg. (D) Systemic vascular resistance units are dyn/s/cm^–5. Open squares: placebo; closed circles: 0.015 µg/kg/min; closed triangles: 0.03 µg/kg/min; open circles: 0.06 µg/kg/min.