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Figure 2 Bar graph comparing the effects of intrapericardial (diamonds) and intracoronary (squares) nitroglycerin on left anterior descending coronary artery luminal area as assessed by intravascular ultrasound. The asterisks indicate significance with respect to baseline value (***p < 0.001, **p < 0.01, *p < 0.05). The curves were statistically different using two-way analysis of variance (p = 0.03). Values are presented as means ± standard errors.