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<div><p class="abstract"><strong>BACKGROUND:</strong> The primary objective of primary percutaneous coronary intervention (pPCI) in patients with acute ST-segment elevation myocardial infarction (STEMI) is not only to restore the blood flow in the infarct-related artery, but also to save the patients&rsquo; quality and duration of their life. Since left ventricular ejection fraction (LVEF) is a known predictor of clinical outcomes in STEMI patients, the possible association between characteristics of a large group of patients who undergo pPCI with LVEF and death was evaluated.</p> <p class="abstract"><strong>METHODS:</strong> This prospective cohort study included 304 patients who had undergone pPCI between 2009 and 2011. The association between LVEF and in-hospital outcomes of patients was assessed.</p> <p class="abstract"><strong>RESULTS:</strong><strong> </strong>LVEF &le; 25%, 25% &lt; LVEF &lt; 50%, and LVEF &ge; 50% were presented in 23 (7.6%), 150 (49.3%), and 128 (42.1%) of the patients, respectively. Three patients (0.01%) died before echocardiography. There was no significant difference among aforementioned three groups regarding baseline characteristics, except age (P = 0.012) and sex (P = 0.016). Cumulative number of cardiogenic shock and death were 7 (2.3%) and 22 (7.2%), respectively; with significant differences between three LVEF groups. Age more than 70 years old, pulmonary edema, systolic blood pressure &lt;100 mm Hg, shock, post-PCI thrombolysis in myocardial infarction (MI) flow grade, corrected thrombolysis in MI frame count, angiographic success and ST-segment resolution showed significant association with death (P &lt; 0.050).</p> <p class="abstract"><strong>CONCLUSION:</strong> This study not only demonstrates that LVEF &le; 50% is associated with a higher incidence of in-hospital adverse events, but also identifies characteristics that are strongly correlated with the risk of LVEF &le; 50% and death after pPCI.</p> <p class="abstract">&nbsp;</p> <p class="abstract"><strong>Keywords:</strong> Myocardial Infarction, Percutaneous Coronary Intervention, Ejection Fraction, Corrected Trombolysis in Myocardial Infarction</p></div><p>&nbsp;</p>