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Figure 4 Assessment of endothelial function in the infarct-related artery at 10 days and 9 months in the same patient post-acute myocardial infarction. At the initial assessment (A), there was a considerable vasoconstriction response to the maximum dose of acetylcholine, which indicates a marked endothelial dysfunction. In the second assessment (B), a vasodilation response to the acetylcholine was observed, which indicates a significant improvement in the grade of endothelial dysfunction in the infarct-related artery at follow-up.