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Figure 3 Response to the maximum concentration of acetylcholine (ACh) in post-acute myocardial infarction (AMI) patients who retained infarct-related artery (IRA) patency and in the control group. Initial study was at 9 ± 2 days following infarct, and the follow-up was 12 ± 3 months later. A significant improvement in the endothelial function in the IRA was observed on follow-up. Endothelial function in the IRA at one-year follow-up was similar to the response detected initially in the control group. Data are expressed as mean ± SEM.