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Figure 4 Bolus angiotensin II infusion increased mean arterial pressure. There was a nonsignificant decrease in the efficacy of angiotensin after 3 h of nitroglycerin treatment, while a nonsignificant increase was observed at 48 h when compared with baseline. Two hours after withdrawal of nitroglycerin treatment, there was a supersensitive response with a significant increase in mean arterial pressure. *p < 0.05 versus baseline.