<qa>  What is the objectivity of current study?The age, creatinine, and ejection fraction ACEF score has been used to evaluate the clinical prognostic to patients who underwent PCI. However, it is not known if ACEF score could evaluate the prognostic of recanalization of non-infarct-related coronary arteries non-IRA chronic total occlusions CTO in patients who successful underwent primary PCI. The objectivity of current study was to assess the prognostic value of ACEF score in acute ST-segment elevation myocardial infarction STEMI patients with non-IRA CTO after successful primary PCI. 