The study population included 40 patients with acute STEMI [acute myocardial infarction (AMI)+PCI: 20 underwent primary PCI; AMI: 20 without PCI] and 40 patients with symptomatic stable angina pectoris (SAP+PCI: 20 underwent PCI; SAP: 20 without PCI). sFKN were measured at different time points by ELIZA.