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Figure 2 Coronary artery patency ratio (CAPR; fraction of an observed observation period during which the coronary flow was >25% of immediate postconstriction flow). Dogs in the control group (n = 6) were given no additional treatment in period 2. Dogs in the sildenafil group were given 100 µg/kg sildenafil bolus followed by an infusion of 4 µg/kg/min during period 2. *p = 0.008; #p = 0.007.