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Figure 2 The effects of cardiac pacing before and after enalaprilat on coronary epicardial segments that initially constricted (left, n = 20) or dilated (right, n = 30) with cardiac pacing. There was no significant difference (p = 0.5) between the mean baseline diameters of constricting segments (2.1 ± 0.1 mm) compared to dilating segments (2.0 ± 0.1 mm). Data represent mean ± SEM.