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Figure 1 Endothelium-dependent and independent vasomotion. Flow-mediated dilation of the brachial artery during reactive hyperemia (endothelium-dependent vasomotion) in subjects with negative exercise myocardial perfusion imaging (ExMPI) is significantly higher than it is in subjects with positive ExMPI. Nitroglycerin-mediated dilation of the brachial artery (endothelium-independent vasomotion) is essentially unchanged between groups. Values are expressed as mean ± standard error. *p = 0.0004.