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Fig. 3. Effect of norepinephrine dose (1 µg kg-1 or 5 µg kg-1) on (A) heart rate (fH), (B) pulmonary (pul) and systemic (sys) blood flow, (C) pulmonary (Ppul) and systemic (Psys) pressure, (D) pulmonary (Rpul) and systemic (Rsys) resistance, (E) total blood flow (tot) and (F) stroke volume (Vstot). a indicates a significant difference (P<0.05) compared with resting conditions, and b indicates a significant difference (P<0.05) compared with the conditions following injection of 1 µg kg-1 norepinephrine. N=8.