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Figure 2 Results (group means ± SEM) for Protocol 2: coronary artery injury + stenosis cyclic variations in coronary flow (CFVs). (A) In vitro platelet aggregation (i.e., maximum impedance in response to 10 µg collagen), and (B) % Flow-time area for control and sildenafil-treated dogs. Black bars indicate controls; white bars indicate sildenafil. PreTreat = data obtained during the initial hour before randomization and treatment. * p < 0.05 vs. control; p < 0.05 vs. PreTreat.