[Effect of left ventricular ejection fraction on clinical long-term follow-up outcomes in patients with acute ST-segment elevation myocardial infarction undergoing primary percutaneous coronary intervention].

Objective: To evaluate the effect of left ventricular ejection fraction (LVEF) on clinical outcomes in patients with acute ST-segment elevation myocardial infarction undergoing primary percutaneous coronary intervention.

Methods: A total of 158 patients with acute ST-segment elevation myocardial infarction undergoing primary percutaneous coronary intervention between January 2005 to December 2007 were enrolled. They were divided into three groups: LVEF≤40% (n=14), LVEF 41%-55% (n=46) and LVEF>55% group (n=98).