Abstract: Objective To investigate the relationship between acute myocardial infarction (AMI)patients with percutaneous coronary intervention (PCI)and no reflow.Methods One hundred and sixteen patients with AMI were given two grade coronary heart disease prevention and anticoagulation before operation.The culprit vessel distal occlusion was confirmed by surgery PCI.Fifty-nine patients with AMI in group A:the lesions were firstly dilated by small balloon and low pressure,then planted with stents.Fifty-seven in patients with AMI in group B:the lesions firstly dilated by small balloon and low pressure,then changing bigger balloon and high pressure dilated again,at last planted with stents.Results The incidence of no reflow in group A was 6 cases.The incidence of no reflow in group B 14 cases.Conclusion The balloon dilation number and expansion intensity in patients with AMI increase the incidence of no reflow.The more intensity the balloon dilation,the high the incidence of no reflow.

Key words: myocardial infarction, balloon dilation, angioplasty, balloon, coronary