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Background To evaluate the effects of intra-aortic balloon pumping (IABP) on plasma brain natriuretic peptide (BNP)level and left ventricular remodeling function in patients with slow coronary flow phenomenon after primary percutaneous coronary intervention (PCI) in acute myocardial infarction (AMI).Methods A total of 28 AMI patients with slow coronary flow phenomenon after primary PCI between January 2008and September 20t0 were enrolled, and randomly divided into the IABP treatment group or control group.Electrocardiogram was measured 1 hour after PCI in each patient.Plasma levels of BNP were detected before PCI, 24hours and 1 week after PCI.Echocardiography was measured 10 days, 3 months and 6 months after PCI.