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Figure 4 Plots of the relation between coronary responses to acetylcholine infusion and a 5% dextrose control infusion (C1) and subsequent improvement in LVEF in patients with acute-onset dilated cardiomyopathy. Left, Association between the epicardial CSA response during infusion of 10^–6 mol/liter acetylcholine and improvement in LVEF on follow-up. Right, Association between the CBF response during infusion of 10^–6 mol/liter acetylcholine and improvement in LVEF at follow-up.