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Figure 2 Microvascular endothelium-dependent vasomotor response. Coronary flow velocity increase in response to intracoronary acetylcholine (ACh). Group 1 = patients with hypercholesterolemia adequately controlled; group 2 = patients with hypercholesterolemia inadequately controlled; group 3 = patients without hypercholesterolemia. *p < 0.05 vs. groups 1 and 3.