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Figure 6 The effects of protamine sulfate (PS) and its complexes with unfractionated heparin (UFH) on mean blood pressure (MBP) values. The course of MBP was tracked for 60 min after short–duration intravenous infusion (5 min; 2 mL/h) of PS at a dose of 1.5 (a) or 10 mg/kg (b) following intravenous administration of vehicle (VEH, 1 mL/kg) or UFH (150 or 1000 U/kg, 1 mL/kg). Results are shown as means (lines) with SEMs. The MBP values at 0 min of the experiment were 121.4 (86.6–138.0) for VEH, 110.7 (91.1–129.4) for PS 1.5 mg/kg, 134.6 (122.8–152.7) for UFH 150 U/kg + PS 1.5 mg, 109.4 (93.1–127.4) for UFH 150 U/kg, 116.9 (108.2–135.6) for PS 10 mg/kg, 120.3 (93.5–130.8) for UFH 1000 U/kg + PS 10 mg/kg, 107.7 (95.2–126.6) for UFH 1000 U/kg. Note: * p < 0.05, ** p < 0.01, *** p < 0.001 vs. VEH, Kruskal–Wallis ANOVA with Dunn’s post–hoc test, n = 5–8.